292
Fault tracing
3ADW000379R0501 DCS550 Manual e e
display
Control Panel
word
active when
M1OvrSpeed (30.16)
parameter settings of group 24 (speed control: speed
controller)
scaling of speed controller loop [SpeedScaleAct (2.29)]
drive speed [MotSpeed (1.04)] vs. measured motor
speed (hand held tacho)
field current too low
speed feedback (encoder, tacho)
connection of speed feedback
if the motor was accelerated by the load
the armature circuit is open (e.g. DC-fuses, DC-
SDCS-COM-8 faulty:
Check:
− Change SDCS-COM-8 and / or SDCS-CON-F
Field exciter low (under-) current:
Check:
M1FldMinTrip (30.12) , FldMinTripDly (45.18)
parameter settings of group 44 (field excitation: field
current controller tuning, EMF controller tuning, flux
linearization)
motor name plate for minimum current at maximum
field weakening (maximum speed)
field circuit fuses
if the field current oscillates
if the motor is not compensated and has a high
-COM-8 com. loss:
− Change SDCS-COM-8 and / or SDCS-CON-F
. fault with DCS Control Panel, DWL during local
Check:
LocalLossCtrl (30.27)
if control DCS Control Panel is disconnected
connection adapter
Hardware failure:
For more details, check Diagnosis (9.11).
Firmware failure:
For more details, check Diagnosis (9.11).
Parameter compatibility:
When
downloading parameter sets or during power-
up the
firmware attempts to write their values. If the setting is not
possible or not
compatible,
the parameter is set to default.
The parameters causing the fault can be identified in
Diagnosis (9.11)
. Check:
t 0
Parameter read:
Reading the actual parameter set or a user parameter set
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