Siemens SINAMICS G150 Manual page 1492

4 Faults and alarms
4.2 List of faults and alarms
Reaction upon A: NONE
Acknowl. upon A: NONE
F07901 Drive: Motor overspeed
Message value: -
Message class: Application / technological function faulted (17)
Drive object: VECTOR_G
Reaction: OFF2 (IASC/DCBRK)
Acknowledge: IMMEDIATELY
Cause: The maximum permissible speed was either positively or negatively exceeded.
The maximum permissible positive speed is formed as follows: Minimum (p1082, CI: p1085) + p2162
The maximum permissible negative speed is formed as follows: Maximum (-p1082, CI: 1088) - p2162
Remedy: The following applies for a positive direction of rotation:
- check r1084 and if required, correct p1082, CI:p1085 and p2162.
The following applies for a negative direction of rotation:
- check r1087 and if required, correct p1082, CI:p1088 and p2162.
Activate pre-control of the speed limiting controller (p1401.7 = 1).
Increase the hysteresis for the overspeed signal p2162. This upper limit is dependent upon the maximum motor
speed p0322 and the maximum speed p1082 of the setpoint channel.
F07902 (N, A) Drive: Motor stalled
Message value: %1
Message class: Application / technological function faulted (17)
Drive object: VECTOR_G
Reaction: OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2)
Acknowledge: IMMEDIATELY
Cause: The system has identified that the motor has stalled for a time longer than is set in p2178.
Fault value (r0949, interpret decimal):
1: Stall detection using r1408.11 (p1744, p0492).
2: Stall detection using r1408.12 (p1745) or via the flux difference (r0083 ... r0084).
3: Stall detection using r0056.11 (only for separately excited synchronous motors).
See also: p1744 (Motor model speed threshold stall detection), p2178 (Motor stalled delay time)
Remedy: It should always be carefully ensured that the motor data identification (p1910) as well as the rotating measurement
(p1960) were carried out (also refer to r3925). For synchronous motors with encoder, the encoder must have been
adjusted (p1990).
For closed-loop speed and torque control with speed encoder, the following applies:
- check the speed signal (interrupted cable, polarity, pulse number, broken encoder shaft).
- check the speed encoder, if another speed encoder was selected using the data set changeover. This must be
connected to the same motor that is controlled for the data set changeover.
If there is no fault, then the fault tolerance (p1744 or p0492) can be increased. For resolvers with a high signal ripple,
for example p0492 should be increased and the speed signal smoothed (p1441, p1442).
If the stalled motor should take place in the range of the monitor model and for speeds of less than 30 % of the rated
motor speed, then a change can be made directly from the current model into the flux impression (p1401.5 = 1). We
therefore recommend that the time-controlled model change is switched in (p1750.4 = 1) or the model changeover
limits are significantly increased (p1752 > 0.35 x p0311; p1753 = 5 %).
- check the speed encoder, if another speed encoder was selected using the data set changeover. This must be
connected to the motor that is controlled for the data set changeover.
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 (r1750.0) or when the speed setpoint is still
zero. If so, increase the current setpoint via p1610 or set p1750.2 = 1 (sensorless vector control to standstill for
passive loads).
- 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 or quick magnetizing selected (p1401).
- check the current controller (p1715, p1717) and the speed adaptation controller (p1764, p1767). If the dynamic
response was significantly reduced, then this should be increased again.
- If there is no fault, then the fault tolerance (p1745) or the delay time (p2178) can be increased.
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SINAMICS G130/G150
List Manual (LH2), 04/2014, A5E03263479A