180
9.2 P
OWER
SUPPLY
ALS 256
ALS
20X
256
9.1.2
Initial state
After switching on the power switch, the power supply
is in the initial state.:
– 5.2 V: The logic voltage is switched on and applies
to the 10pin connector [198A].
– 4 V, 17 V, 75 V: Those voltages are switched off.
They are controlled by a signal coming from the ma-
chine CPU.
The 24 V, 17 V and 75 V voltages can not be
switched on/off separately. They are switched
all together by a signal coming from the ma-
chine CPU.
9.2.1
Power supply functions
Power fail output:
This hardware signal is activated during switching
off the mains supply. It tells the machine CPU to
store important parameter settings. For this purpo-
se, a sufficient voltage supply is available. If this out-
put doesn´t work properly, the settings in the
function menu are not stored.
Power supply fan:
The speed controlled fan provides active cooling of
the power supply. If the fan is defective, the 24 V,
17 V and 75 V voltage outputs are switched off.
Temperature sensor:
The power supply is equipped with a temperature
sensor, which controlles the power supply tempera-
ture. If the sensor is defective or if a critical tempe-
rature is exceeded, the 24 V, 17 V and 75 V voltage
outputs are switched off.
Output voltage control:
The power supply separately monitors the output
voltages. In case of a failure, the relevant output is
switched off and a message is displayed.
[198] Position of the 10pin connector.
A
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