Siemens SINAMICS G120D List Manual page 842

Faults and alarms
List of faults and alarms
F07861 (A) External fault 2
Reaction: OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2)
Acknowledge: IMMEDIATELY (POWER ON)
Cause: The BICO signal "external fault 2" was triggered.
See also: p2107 (External fault 2)
Remedy: Eliminate the causes of this fault.
F07862 (A) External fault 3
Reaction: OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2)
Acknowledge: IMMEDIATELY (POWER ON)
Cause: The BICO signal "external fault 3" was triggered.
See also: p2108 (External fault 3), p3111 (External fault 3 enable), p3112 (External fault 3 enable negated)
Remedy: Eliminate the causes of this fault.
F07900 (N, A) Drive: Motor blocked
Reaction: OFF2 (NONE, OFF1, OFF3, STOP2)
Acknowledge: IMMEDIATELY
Cause: Motor has been operating at the torque limit longer than the time specified in p2177 and below the speed threshold
set in p2175.
This signal can also be triggered if the speed is oscillating and the speed controller output repeatedly goes to its limit.
It may also be the case that thermal monitoring of the power unit reduces the current limit (see p0290), thereby caus-
ing the motor to decelerate.
See also: p2175 (Motor blocked speed threshold), p2177 (Motor blocked delay time)
Remedy: - check that the motor can freely move.
- check the effective torque limit (r1538, r1539).
- check the parameter, message "Motor blocked" and if required, correct (p2175, p2177).
- check the direction of rotation enable signals for a flying restart of the motor (p1110, p1111).
- for U/f control: check the current limits and acceleration times (p0640, p1120).
F07901 Drive: Motor overspeed
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
Reaction: OFF2 (IASC/DCBRK, NONE, OFF1, OFF3, STOP2)
Acknowledge: IMMEDIATELY
Cause: For a vector drive the system has identified that the motor has stall for a time longer than is set in p2178.
Fault value (r0949, interpret decimal):
1: Stall detection using r1408.11 (p1744 or p0492) vector control with encoder.
2: Stall detection using r1408.12 (p1745) or (r0084 - r0083).
See also: p1744 (Motor model speed threshold stall detection), p2178 (Motor stalled delay time)
Remedy: Steps should always be taken to ensure that both motor data identification and the rotating measurement were car-
ried out (see p1900, r3925).
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 con-
nected to the same motor that is controlled for the data set changeover.
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SINAMICS G120D List Manual (LH14), 01/2013