Chapter 4 - Signals and Troubleshooting
IV A 4 - 8 DCS 500B / DCP 500B Operating Instructions
Code
seven
segm.
display
Text on
LCD of control panel
CDP 31x
Definition /
Action
Status
signal
(FAULT_WORD_1/2)
Remark
F 34
Arm. curent ripple
Armature current ripple
One or several thyristors carry no current.
Check: - Current feedback with oscilloscope
(6 pulses within one cycle visible?)
- Branch fuses, thyristor gate con
nection; gate-cathode resistance.
- Sensitivity of monitoring function:
set CUR_RIPPLE_LIM [421] (de
pending on methode; see A 137)
11102 bit 0 (3)
modified
in
S21.232
F 35
Field ex.2 overcurr
FIELD EXCITER 2 (field supply 2) overcurrent
{See Fault Code F 32}
11102 bit 1 (1)
F 36
Field ex.2 comerror
FIELD EXCITER 2 communication error
{See Fault Code
F 33}
11102 bit 2 (1)
F 37
Motor overspeed
Motor overspeed
Speed feedback higher than parameter
[P 2204].
Check: - Scaling of speed controller loop;
- Drive speed;
- Field refererence values;
- Speed feedback and connection
of speed feedback;
- Was the motor accelerated by
the load?
11102 bit 15 (3)
F 38
Phase sequence
fault
Phase sequence fault of power section
Change supply phase sequency or make
correction with parameter
[P 506].
Attention: Direction of rotation of 3-phase
fan correct?
11102 bit 3 (3)
F 39
No field ack.
No field acknowledge from FIELD EXCITER
This message is either caused by the field exciter´s
missing „ready for operation“ signal (1) or the field
current being lower than the threshold (2). Reasons
for (1):
- field supply not in synchronism, or
- electronic power supply for the field unit not within
permissible limits
- power supply for the field unit not within permissi-
ble limits
Reasons for (2):
- field supply unit is broken
- field reversal took too long time
- field current lower than threshold because
11102 bit 4 (1)
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