6.3 If an Alarm Code Appears on the LED Monitor
6-28
[ 41 ] pG PG wire break
Phenomenon: The pulse generator (PG) wire has been broken somewhere in the circuit.
(1) PG(Z phase) wire break under
master-follower operation.
Check whether the pulse generator (PG) is correctly connected to the
option card or any wire is broken.
➔ Check whether the PG is connected correctly. Or, tighten the related
terminal screws.
➔ Check whether the coating is trapped in the connecting part.
➔ Replace the wire(s).
(2) The inverter was affected by
strong electrical noise.
Check noise countermeasures (grounding condition, signal line and
communication cable/main circuit wiring installation method, etc.)
➔ Take noise countermeasures.
➔ Keep the main circuit wiring and control circuit wiring as far apart as
possible.
[ 42 ] d0 Excessive positioning deviation
Phenomenon: The position deviation during position control was excessive.
Check whether an encoder wire break has occurred.
(2) Encoder rotation direction (wiring
phase sequence), motor rotation
direction (inverter output wiring
phase sequence) mismatch
Connect and set so that all directions match.
Review the setting values for d14 to d17 and H190.
(3) The deviation overflow setting
value is too small.
Review the setting values for d223 and d224.
Increase the setting value if too small.
(4) The position control gain is too
small.
Review the setting values for d203 and d204.
Increase the setting value if too small.
(5) The speed control gain is too
small.
Review the setting values for d03 (A45, b45, r45).
Increase the setting value if too small.
(6) Torque limiting has been applied.
If torque limiting is triggered, it will not be possible to perform position
control or speed control correctly. Take the following countermeasures
to prevent torque limiting being applied.
∙ Reduce the load.
∙ Review the acceleration/deceleration time.
∙ Review the machine configuration such as the reduction ratio and
motor capacity to reduce the load.
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