ABB DCS550 Series, Manual

Page: 297 / 316

297
Fault tracing
3ADW000379R0501 DCS550 Manual e e
7-segment
display
Text on DCS
Control Panel
and DWL
Definition / Action Alarm-
word
Alarm is
active when
A
lar
m
level
ArmCurRipple 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
bit 0
A121 121 AutotuneFail Autotuning failed:
For more details, check Diagnosis (9.11). To clear the
alarm set ServiceMode (99.06) = NormalMode or
WinderTuning (61.21) = NotUsed
9.07,
bit 4 always 4
A123 123 FaultSuppres Fault suppressed:
At least one fault message is currently active and
suppressed.
9.07,
bit 6 always 4
A124 124 SpeedScale Speed scaling out of range:
The parameters causing the alarm can be identified in
Diagnosis (9.11).
α
is set to 150°; single firing pulses.
Check:
−
M1SpeedMin (20.01), M1SpeedMax (20.02),
M1SpeedScale (50.01), M1BaseSpeed (99.04)
9.07,
bit 7 always 3
A125 125 SpeedFb Speed feedback:
The comparison of the speed feedback from pulse
encoder or analog tacho has 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
−
analog tacho: tacho itself, tacho polarity and voltage,
alignment, cabling, coupling, mechanical disturbances,
jumper S1 on SDCS-CON-F
−
EMF: connection converter - armature circuit closed
−
SDCS-CON-F
9.07,
bit 8 always 4
A126 126 ExternalDI External alarm via binary input:
There is no problem with the drive itself! Check:
−
ExtAlarmSel (30.32), alarm = 0, ExtAlarmOnSel
(30.34)
9.07,
bit 9 always 4
A127 127 AIRange
Analog input range:
Undershoot of one of the analog input values under 4mA /
2V. Check:
−
AI Mon4mA (30.29)
−
used analog inputs connections and cables
−
polarity of connection
9.07,
bit 10 always 4
A128 128 FieldBusCom Fieldbus communication loss:
F528 FieldBusCom is only activated after the first data
set from the overriding control is received by the drive.
Before the first data set is received, only A128
FieldBusCom is active. The reason is to suppress
unnecessary faults (the start up of the overriding control is
9.07,
bit 11 always if FB
TimeOut
(30.35)
≠
0
4