Siemens Sinumerik 840D sl Diagnostic Manual page 791

03/2009
Remedy: - check that the motor can freely rotate.
- check the torque limit: For a positive direction of rotation r1538, for a negative direction of rotation
r1539.
- check the parameter, message "Motor locked" 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).
- for SERVO with encoderless operation and motors with low power ratings (< 300 W), increase the
pulse frequency (p1800).
- after de-selecting basic positioning, check the torque limits when motoring (p1528) and when regen-
erating (p1529).
207900 <location>Drive: Motor locked/speed controller at its limit
Message -
value:
Drive object: VECTOR
Reaction: OFF2 (NONE, OFF1, OFF3, STOP1, 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 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 acti-
vated (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, p2177
Remedy: - check that the motor can freely rotate.
- check the torque limit: For a positive direction of rotation r1538, for a negative direction of rotation
r1539.
- check the parameter, message "Motor locked" 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).
- for SERVO with encoderless operation and motors with low power ratings (< 300 W), increase the
pulse frequency (p1800).
- after de-selecting basic positioning, check the torque limits when motoring (p1528) and when regen-
erating (p1529).
- in the simulation mode and operation with speed encoder, the power unit to which the motor is con-
nected must be powered up and must be supplied with the torque setpoint of the simulated closed-
loop control. Otherwise, change over to encoderless control (refer to p1300).
207901 <location>Drive: Motor overspeed
Message -
value:
Drive object: SERVO, VECTOR
Reaction: OFF2
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.
207902 <location>Drive: Motor stalled
Message %1
value:
Drive object: SERVO
Reaction: OFF2 (NONE, OFF1, OFF3, STOP1, STOP2)
Acknowledge: IMMEDIATELY
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
SINAMICS-Alarms
2-791