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Flexible
Automation
8.
Fault messages
1070 078 131-104 (00.05) GB
Power Supply Module
Type L 309
Extensive precautions were taken for protecting the thyristor block. These include,
i.a., the following
-
Temperature monitoring
A bimetallic switch is located at the thyristor block which transmits a message to
the timer unit when temperatures
timer is inhibited - the ready signal at the timer goes off and the fault message
"Overtemperature - power supply fault" will be output.
Possible causes
-
not enough cooling water
-
thyristor rating too small
-
Protective circuit against transient overvoltages
In order to prevent the thyristor from being destroyed by overvoltages, it is pro-
tected by an MOV (metal-oxide varistor). In the case of overvoltages in the
mains (e.g. due to spurious peaks or pulses), the MOV acts as a protective
diode, cutting off the peaks. As a result, fuse F4 (FF 6.3 A 500 V 6.3 x 32 mm)
might melt.
For replacement of fuses, please refer to "Maintenance" section.
F3
Fault messages
56 _C are reached. As a consequence, the
Elimination
check water inlet and outlet
calculate % duty cycle, check thyristor
dimensioning on the basis of the load
diagram (please refer to section
"Dimensioning instructions").
F4
19
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