Diagnostics
11.2 List of faults and alarms
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2019, A5E36037884-007
397
Fault
Cause
Remedy
F7901: Motor overspeed
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
•
The maximumly permissible speed has
been exceeded.
•
The speed limit has been exceeded.
•
Check and correct the maximum speed
(p1082).
•
Check and correct the speed limit
(p29070, p29071), and the DI signals
SLIM1 and SLIM2.
•
Check if there are any peaks of actual
speed. If the value of the peak is especial-
ly large, contact the hotline.
F7995: Motor identification
failure
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
For incremental motor, needs pole position
identification when first SON. If the motor
already in run (i.e. by external force) posi-
tion identification may failure.
Stop the motor before servo on.
F30001: Power unit: Overcur-
rent
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
The power unit has detected an overcur-
rent condition.
•
Closed-loop control is incorrectly pa-
rameterized.
•
Controller parameters are not proper.
•
Motor has a short-circuit or fault to
ground (frame).
•
Power cables are not correctly con-
nected.
•
Power cables exceed the maximum
permissible length.
•
Power unit defective.
•
Line phase interrupted.
•
Check the motor data - if required, carry
out commissioning.
•
Modify speed loop Kp (p29120), position
loop Kv (p29110).
•
Check the motor circuit configuration
(star-delta).
•
Check the power cable connections.
•
Check the power cables for short-circuit or
ground fault.
•
Check the length of the power cables.
•
Replace power unit.
•
Check the line supply phases.
•
Check the external braking resistor con-
nection.
F30002: DC link voltage,
overvoltage
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
The power unit has detected overvoltage
in the DC link.
•
Motor regenerates too much energy.
•
Device connection voltage too high.
•
Line phase interrupted.
•
Increase the ramp-down time.
•
Activate the DC link voltage controller.
•
Use a braking resistor.
•
Increase the current limit of the infeed or
use a larger module.
•
Check the device supply voltage.
•
Check the line supply phases.
F30003: DC link voltage,
undervoltage
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
The power unit has detected an undervolt-
age condition in the DC link.
•
Line supply failure
•
Line supply voltage below the permis-
sible value.
•
Line supply infeed failed or interrupted.
•
Line phase interrupted.
•
Check the line supply voltage
•
Check the line supply infeed and observe
the fault messages relating to it (if there
are any)
•
Check the line supply phases.
•
Check the line supply voltage setting.
