290
Fault tracing
3ADW000379R0501 DCS550 Manual e e
display
Control Panel
word
active when
given and the measured mains voltage is too low for
more than 500 ms A111 MainsLowVolt [AlarmWord1
(9.06) bit 10] is set
. It the problem persist for more than
10 s F512 MainsLowVolt [FaultWord1 (9.01) bit 11] is
Mains overvoltage (AC):
Actual mains voltage is > 1.3 *
NomMainsVolt (99.10) for
RdyRun = 1. Check:
if the mains voltage is within the set tolerance
if the mains voltage scaling is correct [NomMainsVolt
(99.10)]
connector X12 and X13 on SDCS-CON-F
− connector X12 and X13 on SDCS-PIN-F
Mains not in synchronism (AC):
The synchronization
with the mains frequency has been
Check:
mains supply
fuses etc.
mains frequency (50 Hz ±5 Hz; 60 Hz ±5 Hz) and
stability (df/dt = 17 %/s) see PLLIn (3.20) at 50 Hz one
period == 360° == 20 ms = 20,000 and at 60 Hz one
period == 360° == 16.7 ms = 16,6667
Field exciter overcurrent:
Check:
in case this fault happens during field exciter
autotuning deactivate the supervision by setting
M1FldOvrCurLev (30.13) = 135
M1FldOvrCurLev (30.13)
parameter settings of group 44 (field excitation: field
current controller tuning)
connections of field exciter
insulation of cables and field winding
− resistance of field winding
Armature current ripple:
One or several thyristors may carry no current.
Check:
CurRippleSel (30.18), CurRippleLim (30.19)
for too high gain of current controller [M1KpArmCur
(43.06)]
current
feedback with oscilloscope (6 pulses within one
cycle visible?)
thyristor gate-cathode resistance
− thyristor gate connection
Speed feedback:
The comparison of the speed feedback from pulse
encoder or analog tacho h
as failed. Check:
M1SpeedFbSel (50.03), SpeedFbFltMode (30.36),
SpeedFbFltSel (30.17), EMF FbMonLev (30.15),
SpeedFbMonLev (30.14)
pulse encoder: encoder itself, alignment, cabling,
coupling, power supply (feedback might be too low),
mechanical disturbances, jumper S4 on SDCS-CON-F
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