Faults and Alarms
List of faults and alarms
3-1578
© Siemens AG 2007 All Rights Reserved
SINAMICS S List Manual (LH1), 07/2007
A07903
Drive: Motor speed deviation
Drive object:
SERVO, VECTOR
Reaction:
NONE
Acknowledge:
NONE
Cause:
The absolute value of the speed difference from the two setpoints (p2151, p2154) and the speed actual value (r2169)
exceeds the tolerance threshold (p2163) longer than tolerated (p2164, p2166).
The alarm is only enabled for p2149.0 = 1.
Possible causes could be:
- the load torque is greater than the torque setpoint.
- when accelerating, the torque/current/power limit is reached. If the limits are not sufficient, then it is possible that
the drive has been dimensioned too small.
- the speed controller is inhibited (refer to p0856; refer to Kp/Tn adaptation of the speed controller).
- for closed-loop torque control, the speed setpoint does not track the speed actual value.
- for active Vdc controller.
- the encoder pulse number was incorrectly parameterized (p0408).
The signal is not generated if the ramp-function generator tracking prevents the setpoint and actual speed from drift-
ing (moving) apart.
Only for vector drives:
For V/f control, the overload condition is detected as the Imax controller is active.
See also: p2149 (Monitoring configuration)
Remedy:
- increase p2163 and/or p2166.
- increase the torque/current/power limits.
- enable the speed controller.
- for closed-loop torque control: The speed setpoint should track the speed actual value.
- correct the encoder pulse number in p0408 or mount the correct tachometer.
A07904 (N)
External armature short-circuit: Contactor feedback signal "Closed" missing
Drive object:
A_INF, B_INF, SERVO, S_INF, VECTOR
Reaction:
NONE
Acknowledge:
NONE
Cause:
When closing, the contactor feedback signal (p1235) did not issue the signal "Closed" (r1239.1 = 1) within the mon-
itoring time (p1236).
Remedy:
- check that the contactor feedback signal is correctly connected (p1235).
- check the logic of the contactor feedback signal (r1239.1 = 1: "Closed", r1239.1 = 0: "Open").
- increase the monitoring time (p1236).
- if required, set the external armature short-circuit without contactor feedback signal (p1231=2).
Reaction upon N:
NONE
Acknowl. upon N:
NONE
F07905 (N, A)
External armature short-circuit: Contactor feedback signal "Open" missing
Drive object:
A_INF, B_INF, SERVO, S_INF, VECTOR
Reaction:
OFF2 (NONE)
Acknowledge:
IMMEDIATELY
Cause:
When opening, the contactor feedback signal (p1235) did not issue the signal "Open" (r1239.1 = 0) within the mon-
itoring time (p1236).
Remedy:
- check that the contactor feedback signal is correctly connected (p1235).
- check the logic of the contactor feedback signal (r1239.1 = 1: "Closed", r1239.1 = 0: "Open").
- increase the monitoring time (p1236).
- if required, set the external armature short-circuit without contactor feedback signal (p1231=2).
Reaction upon N:
NONE
Acknowl. upon N:
NONE
Reaction upon A:
NONE
Acknowl. upon A:
NONE