Siemens SINAMICS V90 Operating Instructions Manual page 294

Diagnostics
12.1 List of faults and alarms
Alarm
A7092: Drive: Moment of
inertia estimator still not ready
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
A7440: EPOS: Jerk time is
limited
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
A7441: LR: Save the position
offset of the absolute encoder
adjustment
Message class: Applica-
tion/technological function
faulty (17)
A7454: LR: Position value
preprocessing does not have
a valid encoder
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
A7455: EPOS: Maximum
velocity limited
Message class: Error in the
parameteriza-
tion/configuration/commission
ing procedure (18)
A7456: EPOS: Setpoint ve-
locity limited
Message class: Applica-
tion/technological function
faulty (17)
294
Cause
The moment of the inertia estimator has
still not determined any valid values.
The acceleration cannot be calculated.
The moment of inertia estimator has stabi-
lized, if the ratio of machine load moment
of inertia (p29022) have been determined.
The calculation of the jerk time Tr = max
(p2572, 2573)/2574 resulted in an exces-
sively high value so that the jerk time is
internally limited to 1000 ms.
Note:
The alarm is also output if jerk limiting is
not active.
The status of the absolute encoder ad-
justment has changed.
In order to permanently save the deter-
mined position offset (p2525), it must be
saved in a non-volatile fashion (p0977).
One of the following problems has oc-
curred with the position actual value pre-
processing:
An encoder is not assigned for the
•
position actual value preprocessing.
An encoder is assigned, but no encod-
•
er data set.
An encoder an an encoder data set
•
have been assigned, however, the en-
coder data set does not contain any
encoder data or invalid data.
The maximum velocity (p2571) is too high
to correctly calculate the modulo correc-
tion.
Within the sampling time for positioning,
with the maximum velocity, a maximum of
the half modulo length must be moved
through. p2571 was limited to this value.
The actual setpoint velocity is greater than
the parameterized maximum velocity
(p2571) and is therefore limited.
Remedy
Traverse the axis until the moment of inertia
estimator has stabilized.
The alarm is automatically withdrawn after the
moment of inertia estimator has stabilized.
Increase the jerk limiting (p2574).
•
Reduce maximum acceleration or maxi-
•
mum deceleration (p2572, p2573).
See also: p2572 (EPOS maximum accelera-
tion), p2573 (EPOS maximum deceleration),
p2574 (EPOS jerk limiting)
Not necessary.
This alarm automatically disappears after the
offset has been saved.
See also: p2525 (LR encoder adjustment
offset)
Check the drive data sets, encoder data sets
and encoder assignment.
Reduce the maximum velocity (p2571).
Check the entered setpoint velocity.
•
Reduce the velocity override.
•
Increase the maximum velocity (p2571).
•
Check the signal source for the externally
•
limited velocity.
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 04/2017, A5E37208830-003