Siemens 6RA7086-6KS22 Operating Instructions Manual page 451

05.05
Fault
No.
Cause as a function of fault value
(r047.001, r949.001 or r949.009 with acknowledged error)
14 The speed has changed by more than 12.5% at a constant speed setpoint even through the applied field current setpoint is
still ≥ 50% of P102 (I F,motor )
Possible cause: as for fault value 12
15 The EMF setpoint is too small to plot a field characteristic
EMF set = U A – I A,motor * R A = P101 – P100 * P110 < 10% of 1.35 * P078.i001
(e.g. P078.i001 = 400 V . . . minimum EMF set = 54 V)
16 Field weakening operation is not allowed in operation without a tachometer (P083=3)
17 The field current controller cannot be optimized because the field circuit time constant cannot be determined (actual field
current does not decay after switch-off to below 0.95*initial value within approximately 1s or to below 0.8 * 0.95*initial
values within approximately 2 s)
Possible cause:
•
Setting in P103 is too high
•
Field circuit inductance is too high
•
Fault in actual field current sensing circuit (gating board or A7001 electronics board defective)
•
Ratio r073.02 / P102 is too high (change P076.02 if necessary)
18 Field weakening range is too wide, i.e. during power-up (at full field) to a speed setpoint of +10% n max , the |EMK| is > 77%
of setpoint EMF (P101 – P100 * P110)
Possible cause:
•
Maximum speed setting is incorrect
•
Pulse encoder parameters are incorrect (P140 to P143)
•
Parameters for tachometer adaptation are incorrect (P741)
•
Setpoint EMF is not correct (P101, P100, P110)
•
An excessively high load torque (in positive or negative direction, e.g. a suspended load) causes the drive to rotate, one
of the armature current or torque limits may be parameterized too low
19 A steady-state actual speed of +10%, +20%, +30% . . . or +100% of the maximum speed cannot be reached within 3
minutes (or maximum value of the three set acceleration times) in speed-controlled operation (the speed setpoint/actual
value difference averaged over 90 firing cycles must equal <0.1% n max for a specific time period)
Possible cause:
•
Acceleration time is set too low (P303, P307, P311)
•
Drive is blocked
•
An excessively high load torque (in positive or negative direction, e.g. a suspended load) causes the drive to rotate, one
of the armature current or torque limits may be parameterized too low
•
Poor speed controller setting (P225, P226, P228) or speed controller is parameterized as pure P controller or with
droop
•
A band elimination filter (P201, P202 or P203, P204) is active
•
Command "Ramp-function generator enable" =0 or "Ramp-function generator STOP" =1 is applied
•
"Field weakening operation" (P081 = 1) is not parameterized
20 Current limit is too low
(With speed controller optimization run: Less than 30% or 45% of P100 (I A,motor ) + the armature current required for zero
speed,
With optimization run for friction moment and moment of inertia compensation: Less than 20% of P100 (I A, motor ) + the
armature current required for a steady-state speed corresponding to 10% of maximum speed)
21 Field weakening range is too wide (n act < +7% n max produces |EMF| > 54% setpoint EMF)
(setpoint EMF= K289= P101 – P100 * P110)
Possible cause:
•
Maximum speed setting is incorrect
•
Pulse encoder parameters are incorrect (P140 to P143)
•
Parameters for tachometer adaptation are incorrect (P741)
•
Setpoint EMF is not correct (P101, P100, P110)
•
Caution:
Even a high absolute negative actual speed value can produce an | EMF | of > 54% setpoint EMF
SIEMENS AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
Description
Further information (r047.002 to r047.016)
Faults / Alarms
10-15