NORD Drivesystems BU0510 - Manual (Page 74)

POSICON position control for NORD frequency inverters, SK 530E and above
74 Subject to technical alterations BU 0510 GB-3911
7.2.5 Miscellaneous encoder faults (universal encoder interface)
Symptom Additional test Possible cause
Hiperface encoders:
Motor has error E25.0 after starting

The Sin/Cos signals are not connected correctly.
The voltage signal can be checked with P709.
SSI encoders:
The position jumps back to 0 too
early.
Multiply Transmit (OFF),
PBF (OFF).
coding is in binary.

The resolution is set too low.
SSI encoders:
The position jumps instead of
counting up or down evenly.
Multiply Transmit (OFF),
PBF (OFF).

The position coding (Gray, binary) is not set
correctly.

The resolution is not set correctly, especially
with Gray coding.
SSI encoders:
The position jumps with a power
of 2.
Multiply Transmit (OFF),
PBF (OFF).
coding is in binary.

The resolution is set too high.
SSI encoders:
Continuous Multiply Transmit error

Encoder does not support Multiply Transmit
BISS encoder:
Communication error although the
encoder is connected.

Resolution set incorrectly
BISS encoder:
Communication error after enabling

Resolution set incorrectly
BISS encoder:
Ratio present, although none has
been set.

Resolution set incorrectly
Encoder reports an internal error.

If the encoder reports an internal error the cause
of the error must be determined from the reason
entered in parameter P650[-01] on the basis of
the documentation from the encoder
manufacturer.

A BISS encoder only reports a 1 as the cause of
the fault. This message means that a fault has
occurred since the last initialisation. If the fault
does not disappear of its own accord, the
encoder voltage supply must be disconnected
for 1 minute in order to reset the fault.

If the fault occurs after a long period of fault-free
operation this indicates that the encoder will
soon fail.
Universal encoder warning 
The encoder reports and internal error P650[-01]
or an internal warning P650[-02]. However, the
fault is not critical for positioning.

A BISS encoder only reports a 1 as the cause of
the warning. This message means that a
warning has occurred since the last initialisation.
If the warning does not disappear of its own
accord, the encoder voltage supply must be
disconnected for 1 minute in order to reset the
message.

If the warning occurs after a long period of fault-
free operation this indicates that the encoder will
soon fail.