SINAMICS G130/G150
List Manual (LH2), 04/2014, A5E03263479A
1491
4 Faults and alarms
4.2 List of faults and alarms
A07899 (N) Drive: Stall monitoring not possible
Message value: Parameter: %1
Message class: Error in the parameterization / configuration / commissioning procedure (18)
Drive object: VECTOR_G
Reaction: NONE
Acknowledge: NONE
Cause: Stall monitoring is not possible, because a change was made into the open-loop speed controlled mode before the
wait time p2177 had expired.
This situation can only occur, if the following conditions apply:
p1300 = 20
p2177 > p1758
p1750.2 = 0
p1750.6 = 0
Remedy: - Deactivate the changeover into open-loop speed controlled operation when operating at the torque limit (p1750.6 =
0).
Condition:
No slow reversing through the open-loop speed controlled operating range p1755 within the time p1758 when
operating at the torque limit.
- shorten the stall detection wait time (p2177 < p1758).
- Activate closed-loop controlled operation from standstill and higher (p1750.2 = 1).
Condition:
There is no active load, for example, a hoisting gear
- Use an operating mode with encoder (p1300 = 21).
Reaction upon N: NONE
Acknowl. upon N: NONE
F07900 (N, A) Drive: Motor blocked
Message value: -
Message class: Application / technological function faulted (17)
Drive object: VECTOR_G
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 in
p2175.
This signal can also be initiated if the speed actual value is oscillating and the speed controller output repeatedly
goes to its limit.
If the simulation mode is enabled (p1272 = 1) and the closed-loop control with speed encoder activated (p1300 = 21),
then the inhibit signal is generated if the encoder signal is not received from a motor that is driven with the torque
setpoint of the closed-loop control.
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 inversion of the actual value (p0410).
- check the motor encoder connection.
- check the encoder pulse number (p0408).
- after de-selecting the "Basic positioner" (EPOS) function mode, check the motoring (p1528) and regenerative
(p1529) torque limit and modify again.
- in the simulation mode and operation with speed encoder, the power unit to which the motor is connected must be
powered up and must be supplied with the torque setpoint of the simulated closed-loop control. Otherwise, change
over to encoderless control (see p1300).
- 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).
Reaction upon N: NONE
Acknowl. upon N: NONE
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