11.98 Malfunctions and warnings
Siemens AG 6SE7087-6AC85-0AA0 ENGLISH
7-1
Common Rectifier Operating instructions
7 Malfunctions and warnings
7.1 Fault signals
The fault relay K440 at terminals X9-4 and X9-5 interrupts. The fault is not stored in the unit.
Possible cause Remedy
Electronic power supply is less than DC 18 V Check electronic power supply of 20 to 30 V;
check fuses F1 and F2.
No rated ac-side voltage selected on S1/S3 A lever on S1 must have been pressed towards
the p.c.b. board or dip-switch S3 must have been
closed.
Several rated ac-side voltages selected on S1 It is permissible for only one lever on S1 to be
pressed towards the p.c.b. board if dip-switch S3
is open. It is not permissible for a lever on S1 to be
pressed towards the p.c.b. board if dip-switch S3
has been closed.
Phase failure for more than 1 second Check the mains.
Overloading of the precharging resistors by
excessive dc link capacitance or load current
tapping during precharging or too frequent
precharging in a short time
Correctly set the rated ac-side voltage on S1 and
adjust all connected converters properly; check
coordination of the build-up of the dc link voltage
and load current tapping as well as the sum of the
dc link capacitances.
Excess temperature of the power section
Switching threshold = 90°C ±5°C
Reduce current extraction; check the air
throughput (fan); check the ingoing air
temperature.
A fault signal is issued immediately via K440 if one of these faults occurs (the unit must then be isolated from all
3 phases of the mains). The unit does not store or indicate the fault.
It is advisable to wire the main contactor as described in the connection suggestion in Chapter 3.5.
The fault is registered by a fault acknowledgement on the latching circuit of the main contactor or a similarly
funcitoning facility. Precharging begins immediately again after the mains voltage has been applied.
7.2 Warning signals
Warning relay K501 at terminals X36-1 and X36-2 interrupts.
Cause Remedy
Excess temperature of the power section
prewarning
Switching threshold = 6°C below the fault signal
threshold (90°C ±5°C)
Reduce current extraction; check the air
throughput; check the ingoing air
temperature.
If the DIP-FIX switch S2 is closed, a warning is
also issued during precharging.
Open DIP-FIX switch S2.
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