Emf For Braking Operation Too High - Siemens SINAMICS DCM List Manual

Fault value (r0949, interpret decimal):
1: Cable break affecting tachometer or incremental encoder TTL/HTL
2: Tachometer or incremental encoder TTL/HTL polarity incorrect
Note:
r50047[1]: Speed actual value (r52179)
r50047[2]: EMF actual value (r52287)
See also: p50357 (Tachometer interruption monitoring threshold)
Remedy: - Check the incremental encoder TTL/HTL's wiring, connections, and function.
- Check the power supply for the incremental encoder TTL/HTL.
- Check the parameters for the incremental encoder TTL/HTL.
- Check the polarity for the speed actual value (p50743).
- Perform an optimization run for the current controller in the armature circuit (p50051 = 25).
- Check the fuses in the armature circuit.
- If the device operates as slave connected in parallel: set p50357 = 100% (tachometer breakage not active).
Reaction upon N: NONE
Acknowl. upon N: NONE
Reaction upon A: NONE
Acknowl. upon A: NONE
F60043 (N, A)

EMF for braking operation too high

Message value: -
Message class: Motor overload (8)
Drive object: DC_CTRL
Reaction: OFF2 (NONE)
Acknowledge: IMMEDIATELY
Cause: The EMF actual value is too high for braking operation.
This fault is triggered if a firing angle greater than 165 ° would be required in the new torque direction immediately
after a torque direction change (precisely because the EMF is so high).
What this actually means is that the fault is triggered if the following 5 conditions are met for a requested torque
direction change (MI or MII is to be selected):
- p50272 = 0 (fault parameterized and not alarm + field weakening)
- An additional torque-free interval which might have been parameterized (p50160 > 0) has expired.
- The parallel drive is ready for the new torque direction to be selected.
- The absolute value of the armature current requested in the new torque direction (r52118, filtered with p50190) is >
1% of r50072[1].
- The calculated firing angle (r52101) for the armature current requested in the new torque direction is > 165 ° or >
p50151 if p50192 = 1.
Possible fault causes:
- "Speed-dependent field weakening" (p50081 = 0) has not been parameterized, although field weakening operation
would be necessary for the required maximum speed.
Note:
With a firing angle Alpha G = 30 ° (rectifier stability limit p50150) and low armature currents, EMF values up to the
peak value of the phase-to-phase line voltage can be reached when motoring.
- Setpoint EMF for field weakening operation too high (parameter p50101 set too high)
- Line voltage dip
- EMF controller or field current controller not optimized; this can lead to excessive EMF when the drive accelerates.
Note:
r50047[1]: Calculated firing angle (armature) prior to limiting (r52101)
r50047[2]: EMF actual value currently measured (r52287)
r50047[3]: Armature current controller setpoint (r52118)
Remedy: - Reduce the speed.
- Activate the "Speed-dependent field weakening" function (p50081 = 1).
Reaction upon N: NONE
Acknowl. upon N: NONE
Reaction upon A: NONE
Acknowl. upon A: NONE
SINAMICS DCM
List Manual (LH8), 02/2015, 6RX1800-0ED76
4 Faults and alarms
4.2 List of faults and alarms
1149