Seca 656 Service Manual
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Seca 656 Service Manual

Seca 656 Service Manual

Electronic platform scale with elongated platform for gurneys and wheelchairs. with pre-tara function for saving up to three adjustable values.
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Variants:
6561321009
6561321109
6561321139
6577021004
6577021009
6577021094
6577021099
6577021154
6577021159
6577021194
6577021199
6577021224
6577021244
6577021284
6577021249
Content:
Short description display module
Short description DMS module
Description of faults
Function diagram
Description calibration
PC configuration program
Cableplan
Replacement
Spare parts list
Manual number:
17-05-01-330-b
Service Manual
for seca 656 / 657
Description:
Electronic platform scale with elongated platform for gurneys and wheelchairs.
With Pre-Tara function for saving up to three adjustable values.
Service Manual Number
17-05-01-330-b
Valid as of:
30-34-00-618 a
30-34-00-645 b
30-34-00-588 c
25-02-02-209 a
30-34-00-603
30-34-00-672 b
08-02-06-022 b
30-34-00-061
30-34-00-062 a
06.07.2011

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Summary of Contents for Seca 656

  • Page 1 Service Manual Variants: for seca 656 / 657 6561321009 6561321109 6561321139 6577021004 Service Manual Number 6577021009 6577021094 17-05-01-330-b 6577021099 Valid as of: 06.07.2011 6577021154 6577021159 6577021194 6577021199 6577021224 6577021244 Description: 6577021284 Electronic platform scale with elongated platform for gurneys and wheelchairs.
  • Page 2 Brief description of the display module Introduction The display modules belong to the family of seca electronic modules and are used to display a weight measured with a suitable module and transferred via the SeSAM bus (Seca’s Serial Autoconfiguring Multicontroller bus). Furthermore, the display modules accommodate the operating elements and can process the weight (hold, tare, etc.).
  • Page 3 Power supply Power supply is provided via the SeSAM bus. Operation With the exception of a start button that might be available, the connected buttons can be configured as required for the particular model. These buttons can be pressed just lightly or longer (longer than 1.5s).

  • Page 4: Optional Functions

    Recalibration In order to compensate for linear measuring errors of the scale, which can, for instance, occur as a result of the different forces of gravity at different geographical points, the module has a recalibration function. To initiate the function, another button must be pressed when the scale is started. The verification counter is then displayed which is incremented whenever the scale is recalibrated.

  • Page 5: Technical Data

    Technical data Supply voltage: 2.7V - 3V and 2.7V - 15V (via SeSAM bus) Supply current: typ. 0.5mA + power supply for backlighting (typ. 100mA) Quiescent current: typ. 2µA Operating temperature: approx. 0°C to 50°C Storage temperature: -10°C to 60°C Dimensions: 74mm x 50mm x 23mm small display...

  • Page 6: Operation

    EEPROM is integrated which is used to configure the module. A connection to the SeSAM bus (Seca’s Serial Autoconfiguring Multicontroller bus) is provided via which the scale can be calibrated and additional modules can be connected.
  • Page 7 Service manual Description of the electronics Display (only DMS low-end module and SLC highend) Whenever eight new measured values are available, i.e. approx. every 0.8 s, the weight is displayed. The display is an LCD which is controlled by duplex operation. A maximum of five digits as well as a few special characters can be displayed.

  • Page 8: Serial Bus

    Service manual Description of the electronics If the start button is directly connected to this interrupt input, a button is obtained which is only active when the scale is switched off. It can be fitted under the platform, for instance, so that the scale is started by briefly stepping on it.
  • Page 9 Service manual Description of the electronics Time base From the quartz’s 4.19MHz a time base is derived which controls all timed processes in the scale. These are, for instance, various timeouts and the on-time. After expiry of the on-time, the supply voltage for the analog part, for voltage measurement and for the EEPROM is switched off.
  • Page 10 Service manual Description of the electronics Technical data Supply voltage: Load cell voltage + 0.5 V to 15 V Supply current: approximate load cell current Zero-signal current: typ. 2µA Operating temperature: approx. 0°C to 50°C Storage temperature: -10°C to 60°C 05.08.03 /Jensen / Rei 34-34-00-645 b...
  • Page 11 Service manual Description of faults Please refer to the operating instructions to ensure that the scales were operated in the proper Please refer to the operating instructions to ensure that the scales were operated in the proper Please refer to the operating instructions to ensure that the scales were operated in the proper Please refer to the operating instructions to ensure that the scales were operated in the proper manner.
  • Page 12 Service manual Description of faults Description of the Possible Remedy fault cause • • • Er:x:11 Sensor is Check connection cables, check sensor and replace as required defective or (if parts a replaced, a recalibration is necessary) supply lines • If several load cell are used, check the allocation (colour codes) are damaged •...

  • Page 14: Calibration Counter

    General: General: Seca scales with modular electronics are fitted with a software-controlled calibration device that is operated using the existing controls. This device can be used to recalibrate the scales or to set the scales to different GAL values. During development of the calibration device, special attention was paid to the following requirements: •...
  • Page 15 Vogel & Halke File: 00603_e1.doc seca Created on: 30.06.1998 Printed on: 07.07.1999 Holger Panier / SE Pressing the kg/lbs key for less than 1.5 seconds causes the weight shown on the display to be increased or decreased by 10 g (depending on the mode currently selected). As the resolution of the display is lower, the displayed value will not necessarily be increased or decreased each time the kg/lbs key is pressed.
  • Page 16 Vogel & Halke File: 00603_e1.doc seca Created on: 30.06.1998 Printed on: 07.07.1999 Holger Panier / SE Summary of a typical recalibration sequence: Summary of a typical recalibration sequence: Action carried out by the user Result The scales are switched off.
  • Page 17 1 (2) PC configuration program page Instructions for PC-based configuration PC-based configuration is used for diagnosis or recalibration of all seca scales with modular electronics. The following equipment is required: • PC with serial interface (RS -232) • seca software 'SERVA”...
  • Page 18 2 (2) PC configuration program page Standard case Connection to the existing display unit port. The display can instead be connected to the second modular socket of the service module. DMS module with integrated display 08-06-18-082 If there is no modular socket on the back of the PCB, retrofit one.

  • Page 20: Replacement Instructions

    Service Manual Replacement instructions seca 656, 657 Removing the power supply The power supply unit must not be connected. ESD protection measures must be taken whenever work is performed on electronic components. Disassembly (the references to pages and items relate to the replacement instructions drawing, pages 4 – 9) Removing and dismantling the frame (Page 4) Slacken the 4 screws (Item 4.2) and remove the frame (Item 4.1).
  • Page 21 Service Manual Replacement instructions Remove the spacer disks (Item 6.11) and the screws (Items 6.12, 6.13). Attention: The longer screws (Item 6.13) are used to screw the load cell cover tight. Removing the adjusting feet (Page 6) Screw out the complete foot (Items 6.14, 6.15) and unscrew the knurled nut (Item 6.15). Dismantling the platform (Pages 4, 5).
  • Page 22 Service Manual Replacement instructions 1. Fitting a new load cell (Page 6) After replacing load cells, the scale must be readjusted and calibrated if required. For adjustment, please follow our calibration instructions, document no. 30-34-00-672. 2. Holder for mains socket and bubble level (Page 6, 8) If you have dismantled the holder or fitted a new bubble level, the scale must be tested again and readjusted and calibrated as required.
  • Page 23 ALL RIGHTS CONCERNING THIS DOCUMENT AND ITS HAMBURG CONTENTS RESERVED. Alle Rechte an und aus diesen 26.06.2006 Unterlagen verbleiben seca gmbh. & co. kg. aschke Maßstab / SCALE: Werkstoff / MATERIAL : Benennung / TITLE : Nr. / NO :...
  • Page 24 ALL RIGHTS CONCERNING THIS DOCUMENT AND ITS HAMBURG CONTENTS RESERVED. Alle Rechte an und aus diesen 26.06.2006 Unterlagen verbleiben seca gmbh. & co. kg. aschke Maßstab / SCALE: Werkstoff / MATERIAL : Benennung / TITLE : Nr. / NO :...
  • Page 25 ALL RIGHTS CONCERNING THIS DOCUMENT AND ITS HAMBURG CONTENTS RESERVED. Alle Rechte an und aus diesen 26.06.2006 Unterlagen verbleiben seca gmbh. & co. kg. aschke Maßstab / SCALE: Werkstoff / MATERIAL : Benennung / TITLE : Nr. / NO :...
  • Page 26 ALL RIGHTS CONCERNING THIS DOCUMENT AND ITS HAMBURG CONTENTS RESERVED. Alle Rechte an und aus diesen 26.06.2006 Unterlagen verbleiben seca gmbh. & co. kg. aschke Maßstab / SCALE: Werkstoff / MATERIAL : Benennung / TITLE : Nr. / NO :...
  • Page 27 ALL RIGHTS CONCERNING THIS DOCUMENT AND ITS HAMBURG CONTENTS RESERVED. Alle Rechte an und aus diesen 26.06.2006 Unterlagen verbleiben seca gmbh. & co. kg. aschke Maßstab / SCALE: Werkstoff / MATERIAL : Benennung / TITLE : Nr. / NO :...
  • Page 28 ALL RIGHTS CONCERNING THIS DOCUMENT AND ITS HAMBURG CONTENTS RESERVED. Alle Rechte an und aus diesen 26.06.2006 Unterlagen verbleiben seca gmbh. & co. kg. aschke Maßstab / SCALE: Werkstoff / MATERIAL : Benennung / TITLE : Nr. / NO :...

  • Page 29: Spare Parts List

    Service manual Spare parts list seca 656 / 657 Item Articel - No. Designation Price stage Baseframe compl. (page 3, 4) (01) 02-02-03-118-509 Baseframe compl. (Pos. 02 – 15, 18 – 22) Parts 02 - 18 (page 3) 02-02-03-302-009 Frame...
  • Page 30 Membrane keyboard (Mod. 657 China) 08-06-16-106-119 Modular cable; 2,7m 14-05-01-930-509 Sticker for window (Mod. 657) 14-05-01-960-509 Sticker for window (Mod. 656, 300 kg) 14-05-01-963-509 Sticker for window (Mod. 656 USA) 14-05-08-223-509 Sticker for window (Mod. 656, 360 kg) 68-32-10-252-009 Plug in power supply unit seca 447...
  • Page 31 (Darstellung ohne Wägezelle) (view without load-cell) 12.1 1 : 5 1 : 2 1 : 5 3 (4)
  • Page 32 4 (4)

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