Siemens G120P

Fault rectification
6
A
larms and faults
51
Siemens AG
CM2G5111en
2014-05-16
Number Cause Solution
 Check that the motor is correctly connected.
F07426 Technology controller actual value
limited
The actual value for the technology controller which is interconnected via connector
input p2264 has reached a limit.
 Adjust the limits to the signal level (p2267, p2268).
 Check the actual value (p2264).
F07801 Motor overcurrent The permissible motor limit current has been exceeded.
 Check the current limits (p0640).
 Vector control: Check the settings for the current controller (p1715, p1717).
 V/f control: Check the settings for the current limiting controller (p1340…p1346).
 Increase the up ramp (p1120) or reduce the load.
 Check the motor and the motor cables for short-circuits or ground faults.
 Check the motor for star-delta connection and rating plate parameterization.
 Check the combination of the power unit and motor.
 Select the flying restart function (p1200) if switched to rotating motor.
F07806 Regenerative power limit exceeded
 Increase the down ramp.
 Reduce the driving load.
 Use a power unit with a higher regenerative feedback capability.
 For vector controls, the regenerative power limit in p1531 can be reduced until
the fault is no longer activated.
F07807 Short circuit detected
 Check the drive connection on the motor side for any phase-to-phase short-
circuit.
 Ensure that no line and motor cables have been accidently mixed up.
F07860
F07861
F07862
External fault 1…3
 The drive receives an alarm from an external source. Rectify the causes of this
fault.
F07900 Motor blocked
 Check that the motor can run freely.
 Check the torque limits (r1538 and r1539).
 Check the parameters of the "Motor blocked" message (p2175, p2177).
F07901 Motor overspeed
 Activate precontrol of the speed limiting controller (p1401 bit 7 = 1).
 Increase the hysteresis for the overspeed signal (p2162).
F07902 Motor stalled
 Check whether the motor data has been set correctly and perform a 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.
A07920
F07923
Torque/speed too low The torque deviates from the torque/speed envelope curve.
 Check the connection between the motor and load.
 Adjust the settings according to the load.
A07921
F07924
Torque/speed too high
A07929 No motor detected The magnitude of the current following enabling of the drive pulses is so small that
no motor is detected.
 Check the motor cables, contactors and switches.
 Reduce the threshold value (p2179, e.g. with synchronous motors)
 Check the voltage boost of the V/f control (p1310)
 Carry out a measurement at standstill in order to set the stator resistance
(p0350).
A07994 Motor data identification not carried
out
The "Vector control" mode is set but motor data identification has not yet been
carried out.
 Carry out motor data identification (see p1900).
 Set the parameters for the "V/f control" (p1300 < 20).
F30001 Power unit: Overcurrent Check the following settings and components: