Siemens CU230P-2 HVAC Parameter Manual page 623

F07902 (N, A) Drive: Motor stalled
Reaction: OFF2 (IASC/DCBRAKE, NONE, OFF1, OFF3, STOP2)
Acknowledge: IMMEDIATELY
Cause: For a vector drive the system has identified that the motor has stall for a time longer than is set in p2178.
Fault value (r0949, interpret decimal):
1: Reserved.
2: Stall detection using r1408.12 (p1745).
See also: p2178 (Motor stalled delay time)
Remedy: Steps should always be taken to ensure that both motor data identification and the rotating measurement were car-
ried out (see also p1900, r3925).
- Check whether the drive stalls solely due to the load in controlled mode or when the speed setpoint is still zero. If
yes, then increase the current setpoint using p1610.
- If the motor excitation time (p0346) was significantly reduced and the drive stalls when it is switched on and run
immediately, p0346 should be increased again.
- Check the current limits (p0640, r0067, r0289). If the current limits are too low, then the drive cannot be magnetized.
- Check whether a line phase failure is affecting power unit PM230, PM250, PM260.
- Check whether the motor cables are disconnected.
If there is no fault, then the fault tolerance (p1745) or the delay time (p2178) can be increased.
A07903 Drive: Motor speed deviation
Reaction: NONE
Acknowledge: NONE
Cause: The absolute value of the speed difference from the setpoint (p2151) and the speed actual value (r2169) exceeds
the tolerance threshold (p2163) longer than tolerated (p2164, p2166).
The alarm is only enabled for p2149.0 = 1.
Possible causes could be:
- the load torque is greater than the torque setpoint.
- when accelerating, the torque/current/power limit is reached. If the limits are not sufficient, then it is possible that
the drive has been dimensioned too small.
- for closed-loop torque control, the speed setpoint does not track the speed actual value.
- for active Vdc controller.
For V/f control, the overload condition is detected as the Imax controller is active.
See also: p2149 (Monitoring configuration)
Remedy: - increase p2163 and/or p2166.
- increase the torque/current/power limits.
- for closed-loop torque control: The speed setpoint should track the speed actual value.
- deactivate alarm with p2149.0 = 0.
A07910 (N) Drive: Motor overtemperature
Reaction: NONE
Acknowledge: NONE
Cause: KTY or no sensor:
The measured motor temperature or the temperature of the thermal model has exceeded the alarm threshold
(p0604). The response parameterized in p0610 becomes active.
PTC or bimetallic NC contact:
The response threshold of 1650 Ohm was exceeded or the NC contact opened.
Alarm value (r2124, interpret decimal):
1: No output current reduction.
2: Output current reduction active.
See also: p0604 (Motor temperature alarm threshold), p0610 (Motor overtemperature response)
Remedy: - check the motor load.
- check the motor ambient temperature.
- check KTY84.
- check temperatures of the thermal model (p0626 ... p0628).
© Siemens AG 2009 All Rights Reserved
SINAMICS G120 Control Units CU230P-2 Parameter Manual (LH9), 11/2009
Faults and Alarms
List of Faults and Alarms
3-623