Yaskawa PC NC - Manual (Page 171)

4 - 9
YASNAC PCNC Operating Manual Chapter 4: Maintenance
(10)Alarm Nos.: 3081 to 3088 (Broken PG Cable)
The A and B phase signal cables are checked for breakage.
(11)Alarm No. 3091 (Broken Spindle PG Cable)
The A, B, and C phase signal cables are checked for breakage.
(12) Alarm Nos.: 3121 to 3125 (Excessive Speed)
This alarm is detected if the motor speed exceeds 1.2 times the maximum motor speed.
Contact your Yaskawa representative.
Table 4.1.5.7: Troubleshooting – Alarm Nos.: 3081 to 3088 (Broken PG Cable)
CAUSE CHECK ITEM COUNTERMEASURES
Signal cables between the
NC and the AC servo drive
unit are broken or loose.
Make sure 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.
Check if the alarm occurs in the first
pressing of POWER ON button even
if the cables are connected correctly.
Contact your Yaskawa
representative.
Error in motor type
parameter setting
Check the motor type setting parameters
(pm 1061 to pm 1065) if “0” has been set.
Correct the setting for the motor
type setting parameters (pm1061
to pm1065).
Table 4.1.5.8: Troubleshooting – Alarm No.: 3091 (Broken Spindle PG Cable)
CAUSE CHECK ITEM COUNTERMEASURES
Signal cables between the
NC and the AC servo drive
unit are broken or loose.
Make sure 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
Check if the alarm occurs in the first
pressing of POWER ON button even
if the cables are connected correctly.
Contact your Yaskawa
representative.
Faulty PG
If an alarm occurs during low speed
operation, the PG could be faulty.
Contact your Yaskawa
representative.