Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual page 257

Number Cause
F07900
Motor blocked
F07901 Motor overspeed
F07902 Motor stalled
F30001 Overcurrent
F30002 DC-link voltage overvoltage
F30003 DC-link voltage undervoltage
F30004 Inverter overtemperature
F30005 I2t inverter overload
F30011 Line phase failure
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Remedy
Check that the motor can run freely.
Check the torque limits (r1538 and r1539).
Check the parameters of the "Motor blocked" message (P2175, P2177).
Activate precontrol of speed limiting controller (P1401 bit 7 = 1).
Increase hysteresis for overspeed message P2162.
Check whether the motor data has been parameterized correctly and
perform motor identification.
Check the current limits (P0640, r0067, r0289). If the current limits are too
low, the drive cannot be magnetized.
Check whether motor cables are disconnected during operation.
Check the following:
Motor data, if required, carry out commissioning

Motor's connection method (Υ / Δ)

V/f operation: Assignment of rated currents of motor and Power

Module
Line quality

Make sure that the line commutating reactor is connected properly

Power cable connections

Power cables for short-circuit or ground fault

Power cable length

Line phases

If this doesn't help:
V/f operation: Increase the acceleration ramp

Reduce the load

Replace the power unit

Increase the ramp-down time (p1121).
Set the rounding times (P1130, P1136).
Activate the DC-link voltage controller (P1240, P1280).
Check the line voltage (P0210).
Check the line phases.
Check the line voltage (P0210).
Check whether the inverter fan is running.
Check whether the ambient temperature is in the permissible range.
Check whether the motor is overloaded.
Reduce the pulse frequency.
Check the rated currents of the motor and Power Module.
Reduce current limit P0640.
When operating with V/f characteristic: Reduce P1341.
Check the inverter's input fuses.
Check the motor cables.
Alarms, faults and system messages
9.5 List of faults
257