Siemens SINAMICS G120D List Manual page 843

If there is no fault, then the fault tolerance (p1744 and p0492) can be increased.
For closed-loop speed and torque control without speed encoder, the following applies:
- check whether the drive stalls solely due to the load in controlled mode or when the speed setpoint is still zero. If
yes, then increase the current setpoint using p1610.
- if the motor excitation time (p0346) was significantly reduced and the drive stalls when it is switched on and run
immediately, p0346 should be increased again.
If there is no fault, then the fault tolerance can be increased (p1745).
- check the current limits (p0640, r0067, r0289). If the current limits are too low, then the drive cannot be magnetized.
- If the fault occurs with fault value 2 when the motor accelerates very quickly to the field weakening range, the devi-
ation between the flux setpoint and flux actual value can be reduced and, in turn, the message prevented, by reduc-
ing p1596 or p1553.
The following generally apply for closed-loop and torque control:
- check whether a line phase failure is affecting power unit PM250D.
- check whether the motor cables are disconnected (see A07929).
If there is no fault, then the delay time can be increased (p2178).
A07903 Drive: Motor speed deviation
Reaction: NONE
Acknowledge: NONE
Cause: The absolute value of the speed difference from the setpoint (p2151) 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:
- 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.
- for closed-loop torque control, the speed setpoint does not track the speed actual value.
- for active Vdc controller.
For U/f control, the overload condition is detected as the I_max controller is active.
See also: p2149 (Monitoring configuration)
Remedy: - increase p2163 and/or p2166.
- increase the torque/current/power limits.
- for closed-loop torque control: The speed setpoint should track the speed actual value.
- de-activate alarm with p2149.0 = 0.
A07910 (N) Drive: Motor overtemperature
Reaction: NONE
Acknowledge: NONE
Cause: KTY or no sensor:
The measured motor temperature or the temperature of the motor temperature model 2 has exceeded the alarm
threshold (p0604). The response parameterized in p0610 becomes active.
PTC or bimetallic NC contact:
The response threshold of 1650 Ohm was exceeded or the NC contact opened.
Alarm value (r2124, interpret decimal):
11: No output current reduction.
12: Output current reduction active.
See also: p0604 (Mot_temp_mod 2/KTY alarm threshold), p0610 (Motor overtemperature response)
Remedy: - check the motor load.
- check the motor ambient temperature.
- check KTY84.
- check overtemperatures of the motor temperature model 2 (p0626 ... p0628).
See also: p0612 (Mot_temp_mod activation), p0625 (Motor ambient temperature), p0626 (Motor overtemperature,
stator core), p0627 (Motor overtemperature, stator winding), p0628 (Motor overtemperature rotor winding)
A07920 Drive: Torque/speed too low
Reaction: NONE
Acknowledge: NONE
Cause: For p2193 = 1:
The torque deviates from the torque/speed envelope characteristic (too low).
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SINAMICS G120D List Manual (LH14), 01/2013
Faults and alarms
List of faults and alarms
3-843