Yaskawa YASNAC PC NC Maintenance Manual User Manual
Page 29
PC NC Maintenance Manual
Chapter 4: Troubleshooting
4-8
(10) Alarm Numbers 3081 to 3088 (Broken PG Cable)
The A and B phase signal cables are checked for breakage.
(11) Alarm Number 3091 (Broken Spindle PG Cable)
The A, B, and C phase signal cables are checked for breakage.
(12) Alarm Numbers 3121 to 3125 (Excessive Speed)
This alarm is detected if the motor speed exceeds 1.2 times the
maximum motor speed.
Contact a Yaskawa customer service representative.
(13) Alarm Numbers 3161 to 3165 (Absolute Error)
Malfunction of the absolute encoder is detected. Contact a
Yaskawa customer service representative after checking the fol-
lowing:
Table 4.8: Troubleshooting - Alarm Numbers 3081 ~ 3088 (Broken PG Cable)
Cause Check
Item
Countermeasures
Signal cables between the
NC and the AC servo drive
unit are broken or loose.
Ensure that the cable connectors are
plugged into the connectors securely.
If they are loose or disconnected,
re-connect them correctly.
Faulty PG cable breakage
detection circuit.
Determine whether the alarm occurs in
the first pressing of the POWER ON
button even when the cables are con-
nected correctly.
Contact your Yaskawa
customer service representative.
Error in motor type param-
eter setting
Determine whether the motor type set-
ting parameters (pm 1061 to pm 1065)
has been set to “0”.
Correct the setting for the motor
type parameters (pm1061 to
pm1065).
Table 4.9: Troubleshooting - Alarm Number 3091 (Broken Spindle PG Cable)
Cause Check
Item
Countermeasures
Signal cables between the
NC and the AC servo drive
unit are broken or loose.
Ensure that the cable connectors are
plugged into the connectors securely.
If they are loose or discon-
nected, re-connect them cor-
rectly.
Faulty PG cable breakage
-detection circuit
Determine whether the alarm occurs in
the first pressing of POWER ON button
even when the cables are connected
correctly.
Contact a Yaskawa customer
service representative.
Faulty PG
If an alarm occurs during low speed
operation, the PG may be faulty.
Contact a Yaskawa customer
service representative.