183
9.2 P
OWER
SUPPLY
ALS 256
ALS
20X
256
9.2.3
Troubleshooting
Symptom
Diagnosis / possible cause
No machine reaction after switching on;
no voltage available.
(no fans are running, display and LEDs
are dark)
After switching the power supply on, only the 5.2 V logic voltage is
switched on.
Check if cable A6802 is plugged completely to the 10pin connec-
tors at the power supply and on the CPU board. The cable plug en-
gages clearly audible to the connector.
Check the logic supply voltage (LED next to the 10pin connector at
the power supply).
– LED off: The power supply output is overloaded (shorted) or the
power supply is defective.
Disconnect cable A6802 from the 10pin connector and switch the
power supply on again.
– LED on: logic voltage (5.2 V) available and stable.
Settings in the function menu are not
stored after switching off.
The power fail signal doesn´t arrive at the CPU; when switching the
machine off, „Power fail - saving done“ is
not
displayed.
Check cable A6802 and replace, if damaged.
Power fail output doesn´t work correctly.
Replace power supply.
Power fail input at the CPU board doesn´t work correctly.
Replace CPU board.
24 V and 17/75 V output voltages are
switched off approx. 10 s after switching
on.
Rotation speed of the power supply fan is being controlled.
If the power supply fan is defective or if the speed control doesn´t work
correctly, the outputs 24 V and 17/75 V are switched off approx. 10 s
after switching the power supply on (overheat protection). The logic
voltage for the CPU board is kept upright.
17/75 V output voltages are missing;
24 V apply over a short term, but are
switched off approx. 10 s after switching
the power supply on.
Overload on 17/75 V, e. g. by short circuit:
Because of the missing supply voltage for the power supply fan, 24 V
voltage is also switched off (for safety reasons).
24 V not available
(machine can not initialize correctly, be-
cause the external sensors need 24 V).
The power supply switches off single outputs, if overload and/or und-
ervoltage occur.
Check if cable A6802 is plugged completely to the 10pin connec-
tors at the power supply and on the CPU board. The cable plug en-
gages clearly audible to the connector.
Check connected loads for short circuit and/or overload.
Summary of Contents for ALS 204
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