Avery Dennison ALS 204 Service And Installation Manual page 184

9 R
EPAIR
9.2 P
OWER SUPPLY
Symptom
24 V and 17/75 V output voltages not
available.
17/75 V not available
ALS 256
Diagnosis / possible cause
The outputs 24 V and 17/75 V are switched on/off by a hardware signal
coming from the CPU board.
Check cable A6802 and replace if damaged.

The power supply signal input doesn´t work properly.
Replace power supply.

CPU hardware signal output doesn´t work properly.
Replace CPU board.

The power supply contains a temperature sensor.
If a sensor fault is detected during operation, the outputs 24V
and 17/75 V are switched off for safety reasons. The logic volt-
age for the CPU is kept upright. An error message is displayed
on the operation panel. The machine stops (earliest with
firmware > V 1.33).
If the sensor detects overtemperature during operation, a
warning is displayed on the operation panel. Furthermore, the
„Warning" output is activated (both earliest with firmware >
1.33). The machne does not stop. If the warnng is ignored and
no steps are taken to decrease the temperature, the outputs
24 V and 17/75 V are switched off as soon as a critical over-
temperature is reached. The logic voltage for the CPU is kept
upright. An error message appears on the display. The ma-
chine stops (earlilest with firmware > 1.33).
Causes / countermeasures:
Surrounding temperature of the machine is too high.
Let the machine cool down.

Dust filter exhausted.
Clean or replace filter liner.

Machine fan defective?
Check function and replace fan if necessary.

The power supply switches off single outputs, if overload and/or und-
ervoltage occur.
Check if connected motordriver bear a short circuit or overload. To

do so, disconnect motordrivers separately from the power supply
and switch on the power supply again.
Check fuses on the motordriver boards and replace if necessary.

184
ALS
20X
256