Kendro HERAcell 150 - Display Pcb or I C-Bus Cable Replacement; Sensor Block Replacement

Name/Name Datum/Date Benennung/Designation
Erstellt/Prepared
D.Dornseiff 01/15/98
Index Änderung Name/Name Datum/Date
Service Handbuch HERAcell 150
Service Manual HERAcell 150
C 202613 D.Dornseiff 06/26/03
Dokumentnr./Document No. Seite/Page
Datei/File
50051109_04_EN_C.doc 50051109 / C 37/ 9
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4.10 DISPLAY PCB OR I²C BUS CABLE REPLACEMENT
In order to change the I
2
C bus cable the exterior door must be removed and
disassembled.
In order to change the display board of the operating panel must be removed.
For this, remove the caps, loosen the screws, and remove the front panel up-
wards.
4.11 SENSOR BLOCK REPLACEMENT
After completing the service tasks:
After the sensor block has been replaced and all functional tests and control
measurements have been performed, the unit MUST be restarted with the
auto-start routine.
Units without O
2
:
The replacement sensor block has been fully preadjusted and calibrated.
Units with O
2
:
The replacement sensor block has been preset with the O
2
compensation default val-
ues.
Refer to Section 4.14.3 regarding the method to check the compensation values.
In either case, the following steps are designed as a functional check.
The unit must be disconnected from the mains power.
The I²C bus system is self-configuring, that is, no adjustments are required.
Switch the unit on, close the glass door, prevent the unit from heating up, check
the operation of the fan.
Units equipped with thermal conductivity detectors:
 Initiate the countervoltage adjustment by activating the -auto-start- routine and
closing the glass door.
 The fan will stop for several seconds. The adjustment process is automatic. Once
the countervoltage adjustment is complete, the fan will switch on again.
 Manually interrupt the -auto-start- routine (the same procedure as starting the
routine).
 Auto-zero starts automatically. Wait for the adjustment to be completed (auto-zero
LED goes out).
 Trigger a mains reset since software version 200.