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9 Appendix
9.21 Changing Control Drives / Potentiometers
9.21.1 How to Replace a Servo Motor
If you replace a motor without pre-calibration it is necessary to check the burner adjustment
after the change, because the potentiometer value and the position of the switches may differ
a little bit. This may lead to an other position of the damper.
WARNING!
Therefore you must prove the burner adjustment again in all firing rate positions and all oper-
ation modes. If necessary adapt the curves in the ETAMATIC.
9.21.2 How to Replace a Potentiometer
WARNING!
Keep switches in the same position.
1 Note actual feedback value at lowest position before changing the potentiometer.
2 Remove old potentiometer.
3 Insert new potentiometer and adjust it so that actual value feedback at lowest position is
the same like noted before.
4 Fix potentiometer in according to the instruction of the motor manufacturer.
5 Verify burner adjustments and change if necessary
WARNING!
Since the normally used potentiometers can have different values, it is possible that the damp-
er has another position than before. Therefore you must prove the burner adjustment n again
after a potentiometer change, at all firing rate points and in all operation modes.
9.22 Changing EPROMs
Changing EEProms
You must generate a protected dataset from the device before you insert the memory ex-
tension.
Crosstip screwdriver size 0
Crosstip screwdriver size 1
Socket wrench size 5,5
Extraction tool for EPROMS
1. Remove:
Switch OFF supply voltage (zero-potential), take off plugs and if necessary take out ET-
AMATIC from the control cabinet.
2. Open the housing:
Remove the 8 countersunk screws from the left side panel.
3. Remove the circuit boards:
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