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738.955 | 10.40
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9 Maintenance
The controller was conceived for years of continuous
trouble-free operation. Nevertheless, faults may occur.
Maintenance may only be performed by professional
personnel.
The fault is usually not in the controller but rather in the
peripheral system components. The following descrip-
tion covers the most common problems encountered
with the controller.
Only send in the controller, with a precise fault
description, if none of the following faults are
present.
9.1 Causes of pro
blems
WARNING
Risk of death by electrocution!
Disconnect the controller from the power supply
before opening the casing.
Cont
roller does not appear to function at all.
Secondary symptoms Possible cause / remedy
The controller dis-
play is blank
• No power supply present
Have professional per-
sonnel check the fuse
and the supply cable.
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