296
Fault tracing
3ADW000379R0501 DCS550 Manual e e
display
Control Panel
word
active when
Motor calculated overload:
Check:
Motor current reduced:
Is shown, when the I
2
T-function is active and the motor
current is reduced. Check:
M1LoadCurMax (31.10), M1OvrLoadTime (31.11) and
Mains low (under-) voltage (AC):
α
is set to 150°; single firing pulses. Check:
PwrLossTrip (30.21), UNetMin1 (30.22), UNetMin2
(30.23),
If all 3 phases are present
if the mains voltage is within the set tolerance
if the main contactor closes and opens
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
In case the On command [UsedMCW (7.04) bit 0] is
given and the measured mains voltage is too low for
more than 500 ms A111 MainsLowVolt [AlarmWord1
(9.06) bit 10] is set. If
the problem persist for more than
10 s F512 MainsLowVolt [FaultWord1 (9.01) bit 11] is
SDCS-COM-8 com. loss:
Check:
− Change SDCS-COM-8 and / or SDCS-CON-F
Armature Current Deviation:
Is shown, if the current reference [
CurRefUsed (3.12)]
differs from current actual [
MotCur (1.06)]
for longer than 5
sec by more than 20% of nominal motor current.
In other words if the current controller cannot match the
given reference, the alarm signal is created. Normally the
reason is a too small incoming vol
tage compared to the
Check:
DC fuses blown
ratio between mains voltage and armature voltage
(either the mains voltage is too low or the motor’s
armature voltage is too high)
− ArmAlphaMin (20.15) is set too high
acho range:
A115 TachoRange comes up for longer than 10
, there is an overflow of the AITacho input. Check:
for the right connections (X1:1 to X1:4) on the SDCS-
CON-F
A115 TachoRange comes up for 10 seconds and
M1OvrSpeed (30.16) has been changed.
In this case a new tacho fine tuning has to be done
[ServiceMode (99.06) = TachFineTune].
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