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Siemens 6RA7086-6KS22 Operating Instructions Manual Page 450

6ra70 series, microprocessor-based converters from 6kw to 2500kw for variable-speed dc drives, simoreg dc master.
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Faults / Alarms
Fault
No.
Cause as a function of fault value
(r047.001, r949.001 or r949.009 with acknowledged error)
4
The armature circuit inductance (P111) cannot be determined from the sampled values of the armature current and line
voltage of the armature current crest last generated
Possible cause:
•P100 (I A,motor ) or r072.i002 (I A,rated ) very much smaller than actual motor rated current of the armature
•L A >327.67mH (armature circuit inductance too large)
•P100 (I A,motor ) very much smaller than r072.i002 (I A,rated )
•Armature circuit short-circuited
5
Offset adjustment of actual field current sensing is not possible
(value detected for P825 is outside permissible value range)
Possible cause:
Fault in actual field current sensing circuit
(defective A7004 gating board or A7001 electronics board)
7
The field circuit resistance (P112) is indeterminable
(the actual field current does not reach the internally specified setpoint of 95% of P102 as a result of P112 variation)
Possible cause:
R A >3276.7Ω
Fault in actual field current sensing circuit (defective gating board or A7001 electronics board)
The command "Inject standstill field" is applied
P102 is set too high
A thyristor in the field bridge is not firing
8
80% of rated EMF (K287=P101 – P100 * P110) cannot be reached within 15s (or maximum of the three set acceleration
times)
Possible cause:
Acceleration time (P303, P307, P311) is set too low
P101 does not match the set maximum speed (U A at n max < P101) or setting for P102 is too low
The command "Ramp-function generator enable"=0 or "Ramp-function generator stop"=1
9
Field current control loop is not stable enough to record field characteristics
(30s after injection of internal field current setpoint, actual field current is deviating by more than (0.39% of P102 + 0.15 %
of r073.002) from the setpoint)
Possible cause:
Field current controller or field current precontrol is not optimized or optimized badly (check P112, P253 to P256 or
execute a current controller optimization run (P051=25))
10
Field characteristic is not uniform
(i.e. in spite of field current setpoint reduction, the flux values of this measuring point calculated from EMF and actual speed
are rising)
Possible cause:
High armature reaction and sharp load variations during recording of field characteristics
Field current controller or field current precontrol is not optimized or optimized badly (check P112, P253 to P256 or
execute a current controller optimization run (P051=25))
A lower field current limit of ≥ 50% of P102 (I F,motor ) is applied
11
(for this reason, it is not possible to plot a minimum of 9 field weakening measuring points)
Possible cause:
P103 ≥ 50% of P102
Check P614 !
The drive has reached the positive torque limit even though the applied field current setpoint is still ≥ 50% of P102
12
(I F,motor )
Possible cause:
Armature current is very "unsteady", e.g. due to high speed controller P gain setting in P225 (on drive with high integral-
action time). In this case, setting a lower actual speed filtering value in P200 and execution of another speed controller
optimization run (P051=26) may help.
Check torque limits
The drive has reached the positive armature current limit even through the applied field current setpoint is still ≥ 50% of
13
P102 (I F,motor )
Possible cause:
Armature current is very "unsteady", e.g. due to high speed controller P gain setting in P225 (on drive with high integral-
action time). In this case, setting a lower actual speed filtering value in P200 and execution of another speed controller
optimization run (P051=26) may help
Check armature current limits
10-14
Description
Further information (r047.002 to r047.016)
SIMOREG DC Master
05.05
SIEMENS AG
6RX1700-0AD76
Operating Instructions

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