P250_Power_Control

Power, control; P250

For technicians and partly for sales managers!

The Pannoramic scanner P250 got a lot of modifications concerning the power supply and the electronics also, these modifications are mostly based on the experiences with the Pannoramic SCAN and the Pannoramic MIDI scanners and the newly implemented components.

Overview

The power supply and control electronics consists of the following components and units:

Main modifications include

The P250 power supply is realized as an internal OEM power supply module.
The power distribution for momentarily unused units or in emergency situations (overheating) can be switched off by the PIC controller firmware.
The focus unit stepper motor was changed to a motor with higher resolution (6400µ-steps / revolution).
Control of the objective changer
Control of the camera changer
Brightfield flash light control.
The Neutral Density (ND) stepper motor.
The X-Y- Z- and ND stepper motors does not contain control electronics; the control electronics for these motors was separated.
Independent temperature sensing and regulation by the control of the fans speed.
Further sensors are implemented.
A darkfield preview illumination was implemented.
Power supply and control of the Lumencor SPECTRA light engine.

Important remark

· After maintenance or services and performed tests of the scanner are 100% finished, protective ground connections and other safety regulations related to hazardous voltages, accessible conductive parts and dangerous to life parts have to be checked (again).

· For safety regulations regarding human health and scanner functionality please refer to: Precautions

Configure electronics components

Since the software version 1.15 the units of the scanner are configured in the file “MicroscopeConfiguration.ini”, section [Microscope].

The actual version of the electronics components in the scanner Pannoramic 250 is defined as follows:

[Microscope]

SerialNumber=xxxx

MicroscopeType=3DMic9

ScanCameraType=

PreviewCameraType=CVrmc_m8_pPro

BarcodeReaderType=PreviewCamera

LoaderType=SL_9Mag_25Slide_Sensor_Vertical

CameraChangerType=CC_None

ReflectorTurretType=RT_None

BrightfieldLightSourceType=FlashLight2010

ObjectiveChangerType=OC_2Pos

ObjectGuideXYZType=OGXYZ_FLASH3

FlashUnitType=FlashUnit_Type2; see also: The X-,X-,Z-,ND- and flash controller

NDFilterType=NDType2

PreviewLightType=PreviewLightUnitType_Type1

PowerSwitchBoardType=PowerSwitchBoard_Type1; see also: The power distribution & switch board

Remark

To enable the X-,X-,Z-,ND- and flash controller:

FlashUnitType=FlashUnit_Type2

Actually, the most recent “Type2” is used.

To disable the X-,X-,Z-,ND- and flash controller:

FlashUnitType=FlashUnit_None

To enable the switch board:

PowerSwitchBoardType=PowerSwitchBoard_Type1

Actually, the most recent “Type1” is used.

To disable the switch board:

PowerSwitchBoardType=PowerSwitchBoard_None

Electrical and electronics units

Power input and main switch

The power input connector and main switch consists of:

Power cord connector (Mains)
Main switch
Fuse housing with fuses

The double-pole main switch disconnects the mains power from the internal power supply.

Each pole is secured by a slow-blow fuse of T3.15 A / 250V.

More information can be found in the “Power input gallery” and the “Power input slide show”

230V~ or 100V~

The alteration of the mains power input in the range from 100V~ to 240V~ is reduced to the use of the appropriate mains power cable!

If the mains power is changed from 230V~ to 100V~ or vice versa, no alterations are required inside the scanner; the change of the mains power is fully handled by the input voltage range of the power supply.

“The power supply TDK -Lambda”.

Check or replace fuses

Disconnect the power cable.
Open the fuse housing and remove the fuse container.

· Push the fuse container lock guide (1) to the center of the fuse container (e.g. with a flat screw driver) and pull it out (2) of its housing.

If the fuses are dismounted, please use an Ohmmeter to check the fuses.
If a fuse exchange is necessary, please use always a slow-blow fuse of T3.15 A / 250V (110V~ or 230V~ power input is unimportant).

More information can be found in the “Power input gallery”

Power supply TDK -Lambda

The internal OEM power supply TDK-Lambda with an input voltage range of 100V~ to 240V~ AC and output voltages of 5V-, 12V- and 24V- DC supplies the internal units of the P250 with power. Inside the controller units (USB, DC, X-, Y-, Z-, ND motor controller, Power distribution board and some stepper motors) a local power supply is located and these create further, required voltages.

· The power supply is short circuit protected.

· The “Emergency power off” switch can be used to switch off the entire scanner if mechanical jamming or any other emergency situation occurs!

· If the input voltage is changed from 230V~ to 110V~ or vice versa, no alterations are required inside the scanner!

Power input

· Press the power input cover a bit downward until the clamps (1) are disconnected from the upper housing part and remove the cover.

· Connect the power wires as shown (2).

· Fit the parts (a) into the slots of the base cover and the clamps (b) into the appropriate slots of the top cover.

“Installation manual” (in more languages); stored

Output voltages; power

5V- /10A DC
12V- / 13A DC
24V- / 18.75A DC

The outputs are short circuit protected and are ground independent (the minus pole is not connected to GND) so each voltage has a plus (+) and a minus (-) pole.

Power_supply_tdk_Lambda_REV 18.1.pdf (stored in this description)

Emergency standby

The Emergency switch inhibits and stops the switching power supply, but the mains voltage of 110V~ or 230V~ is not interrupted; the power supply goes to standby!

By shorting the 2 pins “Inhibit” (the voltage between the two pins is about 15V-) the power supply control is inhibited and all output voltages are disabled (standby mode).

If there is no connection between the two pins (or the standby option is not used), the power supply is running continuously.

These two pins will be shorted, if the “Emergency power off switch” is active and closed!

“Switch “Emergency power off””

Emergency power off switch

The emergency power off switch is situated in the right handed side wall of the scanner and is used to inhibit the power supply; the power distribution is interrupted and all movements are stopped immediately.

If the power is supplied again to the scanner, the software has to be started again!

Mounting of the power unit

The entire power unit (power supply, power distribution and switch board and the current amplifier of the Lumencor SPECTRA) is mounted onto the power supply “TDK-Lambda”.

On the lower edge of the power supply mounting discs are situated from beneath, so the power supply can be shifted in the mounting rail, situated on the bottom of the power box.

Important

Please shift the entire power unit only frontward or rearward.

If the power unit will be inclined sideward or upward during the removal or insert procedure, the mounting discs will be destroyed!

“Base plate and housing truss”

Power distribution and switch board

The power outputs can be switched by software; so momentarily unused units can be switched off, like the brightfield camera during fluorescent scan or any emergency event occurred.

The outputs are switched by the use of relays.

The communication between software and the power distribution board is realized with the control bus connector; this is connected to the USB controller and is used to switch on / off the power outputs and to transfer status information to the USB-controller.

The temperature sensor input controls the fan outputs (Fan1 and Fan2) directly, without any scan software control, bat the temperature value and the fan speed can be read from the software; see also the service program, Low level service, power supply. The fan speed is controlled via the PIC on this switch board, depending on the sensed temperature value.

Mounting of the power distribution and switch board

· By removing the appropriate bolts, the switchboard and / or its holder can be removed.

· The handle is used to shift the entire Power unit in its mounting rail.

Enable or disable of the switch board

For technical enhancements and upgrades, the type of the entire “Power distribution and switch board” can be defined or the board might be disabled.

The relevant parameter and value is found in the section [Microscope] of the file “MicroscopeConfiguration.ini”.

To enable the switch board:

PowerSwitchBoardType=PowerSwitchBoard_Type1

Actually, the most recent “Type1” is used.

To disable the switch board:

PowerSwitchBoardType=PowerSwitchBoard_None

Remark

Usually, the board is enabled.

If the entire “Power distribution and switch board” is disabled, the power supply for the cameras and all other connected units is disabled; the scanner will not start correctly or the powering of the appropriate units have to be realized otherwise; e.g. with external power supplies.

1= reserve 5V- output

2= reserve 5V- output

3= Power output 12V- for the CIS brightfield scan camera

4= Power output 12V- for the PCO edge fluorescent scan camera

5= Power output 24V- switches the current amplifier.

6= reserve 24V- output

7= reserve switch1

8= reserve switch2

9= reserve 24V- output

5V= Power input from the TDK-Lambda power supply

12V= Power input from the TDK-Lambda power supply

24V= Power input from the TDK-Lambda power supply

The switched outputs are ground independent (the minus pole is not connected to GND) so each voltage has a plus (+) and a minus (-) pole.

Connectors Fan1 and Fan2

Via these connectors the fans in the rear wall are connected.

Both fans are handled in parallel mode so any fan can be connected to any connector; the fan connection is interchangeable.

Temperature sensor input

The temperature sensor input is an I²C bus input and the temperature sensors are connected with the cable TMJ-1, TMJ-2.

Temperature sensor, fan and fan control

Because the cameras needs cooling (their temperature must not exceed 60º C (140º F)), temperature sensing and active cooling of the scanner is required.

The sensed temperature value is used to control the speed of the fans directly; without any interaction of the scan software “SlideScanner.exe”.

In the service program, the sensed temperature is shown in [ºC], the fan speed is shown in a value between 1 and 255; 255 is the full speed of the fan.

The sensed temperature value and the fan speed can be read with the service program any time.

If the field “Error” is different from zero, a HW error exists in the temperature sensor and fan control electronics.

Error codes

16 Fan error; the spinning speed of one or both fans is too slow; check and clean the dust filters or the fan blades moving too strong; they have too much resistance in the bearing.

32 Fan error; the blades of one or both fans are not spinning; check cabling, connection; try to rotate the fan blades manually; check for any mechanical reason also.

64 The temperature of 60º C (140º F) reached; check and clean the dust filters of the fans; check the fans connection and the movement of the blades also.

128 Scanner overheated; the relays are switching off; the power to the connected units is interrupted; the temperature reached 70º C.

· Because the error bits are arranged in a byte, other values are possible if more errors existing at the same time; e.g. 96= 64 + 32.

· If the units are switched off by overheating, the scan software SlideScanner.exe shows the error message “Error occurred” and stops working.

Temperature

The temperature inside the P250 is sensed via two, a left and a right sided temperature sensor by the help of the PIC on the switch board.

Probably errors may be:

1 or both temperature sensors are not connected; any wire is broken or has no contact.
Sensor is defective.
Power distribution and switch board is defective.
Identical address of both sensors (after exchange).

“Temperature sensor” and Construction of the P250 “Base plate and housing truss”.

Fans in the rear wall

Both fans are handled in parallel mode; but the spinning of the blades of each fan is also recognized by the PIC separately; there must not be a significant difference between the fans spinning speed.

Probably errors may be:

The signal of any fan spinning sensor (situated inside the fan) is not recognized by the fan control logic, because the fan is not or not well connected; the fan blades does not rotate (any mechanical or cabling reason) or the fan is defective.
If the fan speed is too slow please check and clean the dust and particle filters or the fan blades moving too strong; they have too much resistance in the bearing.
The power distribution and switch board is defective.

“The fan”

Dust filter of the fan

To clean the dust and particle filter please

“Fan covers 1, 2”

Current amplifier for the Lumencor SPECTRA light engine®

The current (power) amplifier is realized by the use of a relay; it is switched on or off by the output 5 of the “Power distribution and switch board”.

Because the relay on the “Power distribution and switch board” output 5 can not handle the required current of 5A DC a second relay is used.

The relay is found in the common housing of the power supply and the “Power distribution and switch board”; see also: Construction of the P250 “Base plate and housing truss”.

USB controller unit

The USB controller connects, supplies and controls all the addressable units and outputs; these are:

X-Y-Z-ND-motor and Flash light control electronics
DC-Controller
Objective changer unit (OC)
Turret unit (stepper motor)
Camera changer unit (CC)
Power distribution & switch board.
Brightfield preview illumination
Barcode illumination
The USB controller gets its +-24V power directly via the cable PWJ-1 from the tdk lambda OEM power supply.

Control, cables and connections

The USB controller receives the command for the units from the program SlideScanner.exe (the scan program) or the SlideScannerService.exe (the service program) via the USB control port of the PC and the USB cable.

All units contain separate electronics and are connected via a bus system. To differentiate the units, connected to the USB controller, some stepper motor electronics and the unit-controller as well has an address. Each data transfer starts with the specified address for the unit and is listen by all units at the same time, but only this unit receives the message, which internal address and the message address is identical. The stepper motor electronics can receive commands (number of steps to go and direction) and can send status information (desired position reached and the status of the sensors Home1 and Home2). The status information is sent via the USB cable to the software, hereby the address of the unit is used also.

With this solution it is possible to change the “Hirschmann” connection with another “Hirschmann” cable (e.g. for fault detection) without any risk or functional restrictions. The label of the cable for digital electronics has no reason in functionality; it differentiates the cables from each other instead, because some cables are shorter than others.

Important

The construction of the controller powering on the board does allow the drive of maximal 3 stepper motors at the same time!

· Please take this into account, if you are working with the service program and the batch test program module!

Power LED

The power LED is lighting if the power is supplied to the Pannoramic scanner (the power cable is connected; the power supply and the emergency switch are switched on).

If the power LED is not lighting

Check the mains power in the connector outlet.
Check the power cable and its right connection.
Check the mains power switch state on the rear.
Check the emergency switch state.
Check the fuses.
Check the conductivity of components “Power input and mains switch”
Check the output voltages of the power supply.
The USB-controller gets the 24V- from the power supply?

If the power LED is flashing

If there is a shortcut inside the scanner, the power supply is switched off by overload; every 200 ms the power supply will switch on itself and tries to supply the output voltages. This behavior makes slightly flashing the power LED; the fans may rotate.

Switch off the mains power of the power supply and measure with the ohmmeter the resistance between the positive and the negative pole of the output voltages 24V, 12V and 5V of the power supply “tdk Lambda”. (Do not measure the +pole in relation to ground, because the voltages are ground independent!)
If the resistance is 1 or 2ohms only or nearly 0 ohm, the defective (shortcut) output is found.

Remove the power output connectors of the “Power distribution and switch board” and switch on the power supply again and measure any output voltage of the power supply.
Remove the Power input connector of the “Power distribution and switch board” and switch on the power supply again and measure any output voltage of the power supply.
Remove the power output connections of +24V of the power supply “tdk Lambda” and switch on the power supply again and measure any output voltage of the power supply.
Remove the power output connections of +12V of the power supply “tdk Lambda” and switch on the power supply again and measure any output voltage of the power supply.
Remove the power output connections of +5V of the power supply “tdk Lambda” and switch on the power supply again and measure any output voltage of the power supply.

If the shortcut disappeared, measure the resistance of the disconnected paths / wires with the ohmmeter against the negative pole of the appropriate output voltage or reconnect the appropriate connections singly, separately to find the faulty path.

Nominal “wire to board” connector positions:

A = Reserve

B = PCJ-1; Power distribution and switch board

C = DCJ-1; DC-Controller

D = DOJ-1; Objective changer

E = STJ-5; Camera changer

F = CUJ-1; X-Y-Z-ND-motor and Flash control

G = BGJ-2; Barcode illumination

H = Reserve

I = Reserve

J = Reserve

K = Reserve

L = Reserve

M = Reserve

N = Reserve

O = BGJ-1; brightfield preview (background) illumination

P = Reserve

Q = Trigger connector for the camera Sony DFW-X710

The USB controller gets its +-24V power directly from the tdk lambda OEM power supply; the minus pole (-) is connected to the pin, named as GND!

The addressable units are connected via the “Hirschmann” connector. The cable contains the power supply for the unit (24V-) and the serial bus (I² C). Via the serial bus the connected units are addressed, receive command and control information and returns status information.

Each connected unit contains a local power supply to create further, required voltages.

Cabling of addressable units

The addressable units are connected with the “Hirschmann” connector (except the Power distribution & switch board); the connection is secured with a knurled nut. On the other end of the cable a “wire to board” connector is used.

Important

Please do not use pliers to loosen or tighten the cable header lock nut. If there is too much force used on the connectors, the soldering of the connector may be destroyed and broken and the appropriate motor or unit will not work.

Trigger connector

The trigger connector is used for the Sony camera or the Grashopper camera.

If the camera is not recognized after changing the USB controller box, please check the correct cabling and the connections as shown on the right.

for the camera Sony DFW-X710

USB controller mounting

On the right side of the rear the USB controller box is situated; it is covered by the right side corner cover.

On the bottom of the USB controller box a mounting rail is situated in which the mounting discs of the USB controller unit are shifted in.

Important

Please shift the entire USB controller unit only frontward or backward.

· If the USB controller will be inclined sideward or upward during the removal or insert procedure, the plastic mounting discs will be destroyed!

Remove the USB controller

Switch off the scanner.
Disconnect all USB controller cables (on the rear part).
Remove the right corner cover.
Pull the entire USB controller unit evenly and straightly backward; otherwise, by moving it up- downward or left / right the mounting discs may be damaged or destroyed!
Disconnect the cables if necessary.

Remove the controller board

Disconnect all the internal cables and wires.
Remove the mounting bolts, situated in the corners of the PCB.
Push the power LED carefully out of its socked from the rear; then the PCB can be removed easily.

Mount the controller board

Connect the wires +24V and -24V to GND of the board first to the appropriate connectors.
Fit and push the power LED into its socked of the rear.
Fit the PCB corner drillings to the PCB standoffs and mount the PCB.
Connect all the internal cables as shown above.

Mount the USB controller

Fit the mounting discs into the mounting rail on the bottom of the USB controller box and shift the unit straightly frontward until the unit stops.

Mount the right corner cover.
Connect the interface cables.
Switch on the power supply.

Addresses

Addresses of scanner units
Unit	Address	Type
X-Y-Z control	00	C_P
USB-controller	01	All
DC-controller	02	P_S_M_D
X-motor	03	S_M_D
Y-motor	04	S_M_D
Z-motor	05	S_M_D
Turret unit	06	S_M_P
Tray loader motor	07	M_C
Slide loader motor	08	M_C
Objective changer	09	C_P_S_M
Camera changer	10	P
RGB illumination	11	C
Not used	12	-----
Immersion liquid unit	13	C
Mechanical shutter	14	C
Switch board	15	C_P
Legend: C=Confocal; P=P250; S=SCAN; M=MIDI; D=DESK

The addresses are used by the scan program and the service program to select the unit; these addresses are programmed into the specified unit and can be changed via special software only. It is important, that none of these addresses should exist twice inside of one Pannoramic scanner, otherwise command and status mismatch occurs.

If data transfer is in progress, all addressable units listen to the address of the data stream.

If the address of the unit is identical with the address of the data stream, the addressed unit is found and this receives the information.

EEPROM

The EEPROM stores the scanner specific parameters and these are collected in the files MicroscopeConfiguration.ini and MicroscopeSettings.ini. To ensure an always proper functioning of the scanner, the content of the EEPROM should be updated after adjustments are done or units are exchanged and parameter values are modified. The EEPROM is a part of the USB controllers PCB.

· To update the content, the EEPROM should be cleared with the service program.

· If the scan software is started and the EEPROM is empty, the content of the appropriate *.ini files will be written automatically from the appropriate folder of the HDD into the EEPROM.

1. Start the program “SlideScannerService.exe”.

2. Click in the field “Clear EEPROM” of the selector menu.

3. Answer the dialogue with “Yes”; then the EEPROM is cleared.

4. Exit the service program with “EXIT”

5. Start the program SlideScanner.exe; the *.ini-files will be automatically saved from the appropriate HDD folder into the EEPROM during startup of the program.

Compressed content of the EEPROM (P250, SCAN, MIDI, DESK)

The compression of the EEPROM content is required since the software version 1.16, because there are newly implemented parameters and the capacity of the EEPROM is limited to be 2kB.

· By compressing the content, memory space is freed up.

In systems, delivered with the version 1.16 the modified handling of the EEPROM content will not be noticed by the user; the files “MicroscopeConfiguration.ini” and “MicroscopeSettings.ini” staying on the HDD in uncompressed form.

· If the EEPROM content is written, the files “MicroscopeConfiguration.ini” and “MicroscopeSettings.ini” will be compressed before these are stored in the EEPROM.

· If the EEPROM is read, the content will be uncompressed before it is stored as file “MicroscopeConfiguration.ini” and “MicroscopeSettings.ini” on the HDD.

If an upgrade is made (from the version 1.15 to the version 1.16) the content in the EEPROM is uncompressed but the version 1.16 expects a compressed content; therefore:

Before you are installing the software version 1.16

· Make sure; the content of the files “MicroscopeConfiguration.ini” and “MicroscopeSettings.ini” is the most recent content on the HDD.

· Save these files to a save place also

Install the software version 1.16

· Start the program “SlideScanner.exe” first time.

· The compression of the EEPROM content will be done automatically.

DC-controller

The DC electronics box is mounted onto the magazine unit from beneath.

The DC-controller switches the DC-motors on or off; collects the status information of the connected sensors and transmits this to the USB-controller.

DC-motor implementation

To prevent the DC-motors from overload if hardware jamming occurs, all commands, starting the DC motors have a time out (started by the scan software). Normally, the motor is stopped with the sensor action before the time is run out. If the sensor action is missed (jamming occurred) the time out event will switch off the motor.

X-Y-Z-ND-motor and Flash light control

Because in the P250 the ND-motor is additionally implemented, the Flash light control has to be resolved and the focus motor is of a different type, a new electronics box was implemented.

The unit realizes the control, connections and interfacing of the following units:

X-motor
Y-motor
Z-motor (focus)
ND-motor
Flash light control for brightfield scan
Trigger connection of the CIS-camera
Darkfield illumination

The power supply and the control of the addressable unit are realized with the “Hirschmann” connector (Bus connector).

The X-, Y-, Z- and ND-stepper motor control electronics is realized with the appropriate module; these motors itself does not contain control electronics.

The motor modules are all from the same type and are interchangeable without address modifying.

Flash light control

The arc frequency of the Flash light source is controlled via the software.

The connector “CIS-camera trg” is software controlled and defines the shutter time and pulse width for the CIS-camera.

Darkfield illumination connector

· The two connectors “DF illumination” provide the power for the darkfield illumination and are interchangeable; the intensity can not be affected.

Motor cable headers

Important

Please do not use pliers to loosen or tighten the cable header lock nuts. If there is too much force used on the connectors, the soldering of the connector may be destroyed or broken and the appropriate motor will not work or may working very noisy.

The wires of the appropriate stepper motor as well as the wires of the sensors are directly connected to the electronics via the motor cable headers.

The construction of the connectors does not allow an interchanging of the two cables to each other, but the motor can be connected to another module; e.g. for fault detection.

· The sensors Home1 and Home2 are also connected via the motor headers.

Important

· For test purposes and fault detection, the motor cable header pair may be connected to another motor output; e.g. the X-motor headers are connected to the Y-motor output.

· In this example, the service program Y-direction will be used to move the X-stage!!

· Before SlideScanner.exe will be started, the motor cable headers have to be connected to their original, correct motor connection!

Stepper motor

Stepper motors

About basics, theory and principles please refer to:

http://www.solarbotics.net/library/pdflib/pdf/motorbas.pdf

Stepper motor basics (stored)

Drive circuit basics (stored)

Stepper motor and driver (stored)

External recirculation diodes (stored)

Stepper motor driving (stored)

Stepper motors 2011 (stored)

Parts; components

Background (preview) brightfield illumination

The preview illumination consists of 6 LED’s and is used to illuminate the scannable part of the slide and makes so the sample visible for the preview camera.

The preview illumination exists as a 0R version only.

The output for the preview illumination is driven by a current generator. The intensity of the backlight can be adjusted in the range between 1 and 255 (maximum) in the service program only, 0 means the backlight is switched off. The parameter is removed in the software version 1.15 from the file “MicroscopeConfiguration.ini” section [PreviewAndBarcodeScanning].

Barcode illumination

The barcode illumination consists of four LED’s and is used to illuminate the barcode area of the slide and makes so the barcode visible for the preview camera.

The barcode illumination exists as a 0R version only. The output for the preview illumination is driven by a current generator. The intensity of the backlight can be adjusted in the range between 1 and 255 (maximum) in the service program only, 0 means the backlight is switched off. The parameter is removed in the software version 1.15 from the file “MicroscopeConfiguration.ini” section [PreviewAndBarcodeScanning].

Optical sensors OPJ-1 and 2 (left and right magazine sensor)

If the optical sensor is pushed by the magazine, the light path between LED and photo transistor will be broken by a pin. This action is recognized by the software.

The sensors are situated on the magazine feeder channel bottom plate and their positions are fixed.

The sensors do not need adjustment.
The sensors should be kept clean. Because the action path is very short, even small glass shards or dust is able to prevent the sensor from correct switching.

“How to exchange the sensors OPX_1_2”

Optical interrupter H22LOI Datasheet; stored

Hall sensors

The “Magazine Loader Sensor”, the “Magazine feeder sensor”, the “Input stack sensor”, the “Output stack sensor” and the “External home sensor” of the turret unit are realized with Hall elements.

If the south pole of a magnet is over the Hall element or the north pole on the opposite side, the switch is closed and this state is recognized by the software.
If the polarity of the permanent magnet is inverted or a magnetic field is not present, no action occurs.
The sensors are so implemented, that the south pole of the permanent magnet stays over the sensor surface if the action position is reached.

The sensor position is often adjustable. For adjustment procedures see the appropriate chapters.

The sensor does not need maintenance.

Hall sensors Wikipedia

TLE4905L Datasheet; stored

Input and output stack sensors

Each magazine has a permanent magnet, implemented beside the rear upper left corner. The sensors, implemented into the left-sided rail of the input and the output stack are used to detect the presence of a magazine.

“Stack rails”.

The hall elements are glued in their positions. If an exchange of the hall element has to be done, the correct position of the sensor in relation to the acting range is important during gluing!

· Please check the acting range with the service program

Acting range in the input stack

· If the Magazine is placed onto the magazine input stack wheels, the sensor “tray Hall 1” should be surely active.

· If the magazine is manually moved upward in the input stack, the signal should be inactive if a gap of about 1mm to the input stack wheels is reached. This way the correct insertion of the magazine will be checked also.

Acting range in the output stack

· If 9 Magazines are placed onto the magazine output stack wheels, the sensor “tray Hall 2” should be surely active.

· If the magazine is manually moved upward in the output stack, the signal should be inactive if a gap of about 2mm to the previous magazine is reached.

Temperature sensors

Type: Maxim DS1621S

Voltage: 3.6V ~ 5.5V max

Data sheet: DS1621S

Address coding

Because the sensors are used in a bus system (I²C), the sensors are distinguished from each other by their address. The position of the appropriate sensor address on the left side or on the right side of the scanner is not important, but the sensors must have a different address, otherwise, data mismatch occurs.

· The address line A1 is always 0; it may be used in the future, in other solutions.

Fan

Type: ebmpapst 3412 N/2G

Power: 12V-DC 185mA; 2.2W with spinning sensor (operating range = 8V- to 15V-

Max spin speed: 2700 rpm

By control of the fan’s voltage via the PIC on the “Power distribution and switch board”, the spinning speed of the blades will be affected; and so the air quantity, blown into the scanner.

The fan speed can be calculated by the following formula:

Fan speed = (2700 / maximal speed value) x actual value.

In the example on the right the fan speed is:

Fan speed = (2700 / 255) x 26 = 275 rpm.

ND filter unit stepper motor

Type: Nanotec ST2018L0804-A

Power: 4.8V 0.8A

Resolution (full steps): 200 steps/revolution

· The stepper motor is used to rotate the ND filter disc in the ND filter housing to adjust the brightness of the illumination for the brightfield scan procedure.