Siemens SINAMICS V90 Operating Instructions Manual page 321

Fault
F7430: Changeover to open-
loop torque controlled opera-
tion not possible
Reaction: OFF2
Acknowledgement: POWER
ON
F7431: Changeover to en-
coderless operation not pos-
sible
Reaction: OFF2
Acknowledgement: POWER
ON
F7442: LR: Multiturn does not
match the modulo range
Reaction: OFF1 (OFF2,
OFF3)
Acknowledgement:
IMMEDIATELY
F7443: Reference point coor-
dinate not in the permissible
range
Reaction: OFF1 (OFF2,
OFF3)
Acknowledgement:
IMMEDIATELY
F7450: Standstill monitoring
has responded
Reaction: OFF1
Acknowledgement:
IMMEDIATELY
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2015, A5E36037884
Cause
For encoderless operation, the converter
cannot change over to closed-loop torque-
controlled operation.
For closed-loop torque control, the con-
verter cannot change over to encoderless
operation.
The ratio between the multiturn resolution
and the modulo range (p29246) is not an
integer number. This results in the adjust-
ment being set back, as the position actual
value cannot be reproduced after power-
off/power-on.
The reference point coordinate received
when adjusting the encoder via connector
input p2599 lies outside the half of the
encoder range and cannot be set as actual
axis position.
After the standstill monitoring time expired,
the drive left the standstill window.
Position loop gain too low.
•
Position loop gain too high (instabil-
•
ity/oscillation).
Mechanical overload.
•
Connecting cable, motor/drive convert-
•
er incorrect (phase missing, inter-
change).
11.2 List of faults and alarms
Remedy
Do not attempt to change over to closed-
•
loop torque-controlled operation.
Check the encoder cable connection.
•
Do not attempt to change over to encoder-
•
less operation.
Check the encoder cable connection.
•
Make the ration between the multiturn resolu-
tion and the modulo range an integer number.
The ratio v is calculated as follows:
Motor encoder without position tracking
•
(p29243 = 0):
v = (4096 * p29247 * p29248)/(p29249 *
p29246)
Motor encoder with position trakcing
•
(p29243 = 1):
v = (p29244 * 29247)/p29246
Set the reference point coordinate to a lower
value than specified in the fault value.
See also: p2599 (EPOS reference point coor-
dinate value.
For a motor with an absolute encoder, the
maximum permissible encoder range is calcu-
lated by the formula (4096xp29247)/2.
Check the causes and resolve.
Diagnostics
321