46
Chapter 7
– Troubleshooting
XtrapulsCD1-a
1.9 - "FEEDBACK" FAULT IN THE ENCODER FEEDBACK CONFIGURATION
Check the encoder supply connection on the drive X3 connector.
Check the encoder A channel and B channel connections on the drive X3 connector.
Remark
: In the
Incremental encoder
configuration
without HES
, the motor
Phasing
procedure must be carried
out again after a
Feedback
fault release.
1.10 - "COUNTING" FAULT IN THE ENCODER FEEDBACK CONFIGURATION
Check the marker pulse connection on the drive X3 connector. If the motor encoder is not providing a marker
pulse channel output, the drive marker pulse channel must be disabled in order to cancel the
Counting
fault. The
drive marker pulse channel can be disabled by setting at 0 the
Zero mark pitch
parameter.
For the
TTL incremental encoder
configuration:
Check for the correct encoder supply voltage value
Check for the correct encoder-drive-motor ground and shield connections with regard to the recommendations
of
chapter 4
.
Check for the correct encoder A channel, B channel and Z marker signal waveforms.
Check that the following conditions are answered for taking into account the maximum value of the encoder
pulse frequency at the maximum motor speed value :
Max. motor speed (rpm) < 60 x 10
6
/ Number of encoder pulses per revolution
Max. motor speed (rpm) < 60 x Encoder pulse frequency limit (Hz) / Number of encoder pulses per revolution
Check that the
Motor encoder resolution
and the
Zero mark pitch
parameter values are correct.
Check that the number of encoder pulses between two successive Z marker pulses is equal to the
Motor
encoder resolution
value multiplied by the
Zero mark pitch
parameter value. If this condition is not fulfilled,
the encoder counting protection must be disabled in order to cancel the
Counting
fault. The encoder counting
protection can be disabled by setting at 0 the
Zero mark pitch
parameter.
For a linear motor with only one marker pulse over the entire motor travelling range, the parameter
Zero
mark pitch
must be set at 15. In this case the encoder counting protection is checking that the measured
encoder position has always got the same value when the marker pulse is activated (no position
measurement drift).
When the encoder counting protection has been disabled, the drive is only checking that the
encoder pulses frequency is lower than 1.5 times the maximum encoder frequency. The maximum
encoder frequency is calculated into the drive according to the
Motor encoder resolution
parameter value and the
Maximum speed
parameter value. In this case, encoder pulse noises at a
frequency lower than 1.5 times the maximum encoder frequency may involve uncontrolled motor
movements that may be dangerous for operator and machine.
!
When the drive marker pulse channel has been disabled, the encoder counting protection is no more
active. In this case, encoder pulse noises may involve uncontrolled motor movements that may be
dangerous for operator and machine.
!
