Siemens Sinumerik 840D sl Diagnostic Manual page 751

03/2009
Cause: The function DSC (Dynamic Servo Control) was activated although there is no encoder.
See also: p1191 (DSC position controller gain KPC)
Remedy: If there is no encoder and CI: p1191 (DSC position controller gain) is interconnected, then connector
input CI: p1191 must have a 0 signal.
207430 <location>Drive: Changeover to open-loop torque controlled operation
not possible
Message -
value:
Drive object: SERVO
Reaction: OFF2 (NONE, OFF1, OFF3)
Acknowledge: IMMEDIATELY
Cause: For encoderless operation, the converter cannot change over to closed-loop torque-controlled opera-
tion (BI: p1501).
Remedy: Do not attempt to cover over to closed-loop torque-controlled operation.
207431 <location>Drive: Changeover to encoderless operation not possible
Message -
value:
Drive object: SERVO
Reaction: OFF2 (OFF1)
Acknowledge: IMMEDIATELY
Cause: For closed-loop torque control, the converter cannot change over to encoderless operation (p1404).
Remedy: Do not attempt to change over to encoderless operation.
207432 <location>Drive: Synchronous motor without overvoltage protection
Message %1
value:
Drive object: SERVO
Reaction: OFF2 (OFF1)
Acknowledge: IMMEDIATELY
Cause: Under voltage conditions, a synchronous motor can generate an overvoltage condition that can
destroy the drive system.
Fault value (r0949, interpret hexadecimal):
Associated Drive Data Set (DDS).
Remedy: Overvoltage protection can be implemented in the following ways:
- limit the maximum speed (p1082) without any additional protection.
The maximum speed without protection is calculated as follows:
Rotary motors: p1082 [rpm] <= 11.695 * p0297/p0316 [Nm/A]
Linear motors: p1082 [m/min] <= 73.484 * p0297/p0316 [N/A]
- use a voltage protection module (VPM) in conjunction with the function "Safe Torque Off" (p9601,
p9801).
When a fault condition exists, the VPM short-circuits the motors. During the short-circuit, the pulses
must be suppressed - this means that the terminals for the function "Safe Torque Off" must be con-
nected to the VPM.
When using a VPM, p0643 must be set to 1.
- activating the internal voltage protection (IVP) with p1231 = 3.
See also: p0643 (Overvoltage protection for synchronous motors), p1231 (Armature short-circuit / DC
brake configuration)
207433 <location>Drive: Closed-loop control with encoder is not possible as the
encoder has not been unparked
Message %1
value:
Drive object: SERVO
Reaction: NONE (OFF1, OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: The changeover to closed-loop control with encoder is not possible as the encoder has not been
unparked.
© Siemens AG 2009 All Rights Reserved
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
SINAMICS-Alarms
2-751