Siemens 6RA7086-6KS22 Operating Instructions Manual page 450

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