Siemens SINAMICS V90 Operating Instructions Manual page 284

Diagnostics
12.1 List of faults and alarms
Fault
F7575: Drive: Motor encoder
not ready
Message class: Actual posi-
tion/speed value incorrect or
not available (11)
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
F7599: Encoder 1: Adjust-
ment not possible
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
Reaction: OFF1 (NONE,
OFF2, OFF3)
Acknowledgement:
IMMEDIATELY
F7800 Drive: No power unit
present
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
Reaction: NONE
Acknowledgement:
IMMEDIATELY
F7801: Motor overcurrent
Message class: Motor over-
load (8)
Reaction: OFF2
Acknowledgement:
IMMEDIATELY
284
Cause
The motor encoder signals that it is not
ready.
Initialization of motor encoder was
•
unsuccessful.
The function "parking encoder" is ac-
•
tive (encoder control word G1_STW.14
= 1).
The maximum encoder value times the
factor to convert the absolute position from
increments to length units (LU) has ex-
ceeded the value range (-2147483648 ...
2147483647) for displaying the position
actual value.
The power unit parameters cannot be read
or no parameters are stored in the power
unit.
The permissible motor limit current was
exceeded.
Effective current limit set too low.
•
Current controller not correctly set.
•
Motor was braked with an excessively
•
high stall torque correction factor.
Up ramp was set too short or the load
•
is too high.
Short-circuit in the motor cable or
•
ground fault.
Motor current does not match the cur-
•
rent of Motor Module.
Remedy
Evaluate other queued faults via motor en-
coder.
If the value for the maximum possible abso-
lute position (LU) is greater than 4294967296,
then it is not possible to make an adjustment
due to an overflow.
For rotary encoders, the maximum possible
absolute position (LU) is calculated as fol-
lows:
Motor encoder with position tracking:
EPOS: p29247 * p29244
Motor encoder without position tracking:
For multiturn encoders:
•
EPOS: p29247 * p29248 * 4096 / p29249
For singleturn encoders:
•
EPOS: p29247 * p29248 / p29249
Carry out a POWER ON (power off/on) for
•
all components.
Change the module.
•
Reduce the stall torque correction factor.
•
Increase the up ramp or reduce the load.
•
Check the motor and motor cables for
•
short-circuit and ground fault.
Check the Motor Module and motor com-
•
bination.
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2017, A5E37208830-003