Operating Instructions

Service, maintenance and fault rectification
Fault rectification
8
101 |
118
Siemens
A5E36496664A_f
Smart Infrastructure 2021-10-11
Number Cause Solution
F07330 Search current measured
too low
1. Increase the search current (p1202).
2. 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.
1. Adjust the limits to the signal level (p2267, p2268).
2. Check the actual value (p2264).
F07801 Motor overcurrent The permissible motor limit current has been exceeded.
1. Check the current limits (p0640).
2. Vector control: Check the settings for the current
controller (p1715, p1717).
3. V/f control: Check the settings for the current limiting
controller (p1340…p1346).
4. Increase the up ramp (p1120) or reduce the load.
5. Check the motor and the motor cables for short-
circuits or ground faults.
6. Check the motor for star-delta connection and rating
plate parameterization.
7. Check the combination of the power unit and motor.
8. Select the flying restart function (p1200) if switched
to rotating motor.
F07806 Regenerative power limit
exceeded
1. Increase the down ramp.
2. Reduce the driving load.
3. Use a power unit with a higher regenerative
feedback capability.
4. For vector controls, the regenerative power limit in
p1531 can be reduced until the fault is no longer
activated.
F07807 Short-circuit detected
1. Check the drive connection on the motor side for any
phase-to-phase short-circuit.
2. Ensure that no line and motor cables have been
accidently mixed up.
F07860
F07861
F07862
External fault 1…3  The variable speed drive receives an alarm from an
external source. Rectify the causes of this fault.
F07900 Motor blocked
1. Check that the motor can run freely.
2. Check the torque limits (r1538 and r1539).
3. Check the parameters of the "Motor blocked"
message (p2175, p2177).
F07901 Motor overspeed
1. Activate precontrol of the speed limiting controller
(p1401 bit 7 = 1).
2. Increase the hysteresis for the overspeed signal
(p2162).
F07902 Motor stalled
1. Check whether the motor data has been set correctly
and perform a motor identification.
2. Check the current limits (p0640, r0067, r0289). If the
current limits are too low, the drive cannot be
magnetized.
3. Check whether motor cables are disconnected
during operation.
A07920
F07923
Torque/speed too low The torque deviates from the torque/speed envelope
curve.
1. Check the connection between the motor and load.
2. Adjust the settings according to the load.
A07921
F07924
Torque/speed too high