Siemens SIMOREG DC Master 6RA7028-6DS22 Operating Instructions Manual page 377

02.00
Fault
No.
Cause as a function of fault value
(r047.001, r949.001 or r949.009 with acknowledged error)
Fault value:
Armature current is too low when α=30° and EMF=0.
1
(average armature current <75% of I A, motor or <75% of I A, rated )
Possible cause:
•
Armature circuit interrupted
•
High-resistance load
•
P150 (Alpha G limit) has been set to excessively high value
It was not possible to determine the armature circuit resistance (P110) because the armature current was ≥ 37.5 % of
2
P100 in fewer than 20 of the 150 firing cycles of the measuring phase.
Possible cause:
• Armature current of 37.5% of P100 (I A, motor ) is no longer possible (although a current of 75% of P100 was already
flowing, maybe a fuse has blown).
Armature current peaks are too small at α=30° and EMF=0
3
(armature current peak value <50% of I A, motor or <50% of I A,rated )
Possible cause:
•
Armature circuit inductance is too high (field supply from armature terminals)
•
P150 (Alpha G limit) has been set to excessively high value
Possible remedy:
•
Reduce P100 (I A,motor ) while this optimization run is in progress
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))
SIEMENS AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
Description
Further information (r047.002 to r047.016)
Faults / Alarms
10-13