Siemens Sinumerik 840D sl Diagnostic Manual page 747

03/2009
Cause: An incorrect commutation angle was detected, that can result in a positive coupling in the speed con-
troller.
Possible causes:
- the motor encoder is incorrectly adjusted with respect to the magnet position.
- the motor encoder is damaged.
- the angular commutation offset is incorrectly set (p0431).
- data to calculate the motor model has been incorrectly set (p0356 (motor-stator leakage inductance)
and/or p0350 (motor-stator resistance) and/or p0352 (cable resistance).
- the changeover speed for the motor model is too low (p1752). The monitoring function only becomes
effective above the changeover speed.
- the motor encoder speed signal is faulted.
- the control loop is instable due to incorrect parameterization.
Fault value (r0949, interpret decimal):
SERVO:
0: The comparison of the pole position angle from the encoder and the motor model resulted in an
excessively high value (> 80 ° electrical).
1: -
VECTOR:
0: The comparison of the pole position angle from the encoder and the motor model resulted in an
excessively high value (> 45 ° electrical).
1: The change in the speed signal from the motor encoder has changed by > p0492 within a current
controller clock cycle.
Remedy: - if the encoder mounting was changed - re-adjust the encoder.
- replace the defective motor encoder.
- correctly set the angular commutation offset (p0431).
- correctly set the motor stator resistance, cable resistance and motor-stator leakage inductance
(p0350, p0352, p0356).
- increase the changeover speed for the motor model (p1752). The monitoring is completely de-acti-
vated for p1752 > p1082 (maximum speed)
Note:
For High Dynamic Motors (1FK7xxx-7xxx), for applications with a higher current, if necessary, the
monitoring should be disabled.
207413 <location>Drive: Commutation angle incorrect (pole position
identification)
Message -
value:
Drive object: SERVO, VECTOR
Reaction: ENCODER (NONE, OFF2)
Acknowledge: IMMEDIATELY
Cause: An incorrect commutation angle was detected, that can result in a positive coupling in the speed con-
troller.
- within the pole position identification routine (p1982 = 2):
A difference of > 45° electrical to the encoder angle was determined.
- for VECTOR, within the encoder adjustment (p1990 = 2):
A difference of > 6 ° electrical to the encoder angle was determined.
Remedy: - correctly set the angular commutation offset (p0431).
- re-adjust the motor encoder after the encoder has been replaced.
- replace the defective motor encoder.
- check the pole position identification routine. If the pole position identification routine is not suitable
for this motor type, then disable the plausibility check (p1982 = 0).
207414 <location>Drive: Encoder serial number changed
Message -
value:
Drive object: SERVO
Reaction: ENCODER (NONE, OFF2)
Acknowledge: IMMEDIATELY
© Siemens AG 2009 All Rights Reserved
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
SINAMICS-Alarms
2-747