Siemens SIMOTICS S-1FL6 - Page 399

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.