11-22
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Troubleshooting and Maintenance
Alarm No. 99.0
Alarm No. 99.0 may occur due to the timing between safety input 1/2 and alarm clear input.
This alarm will occur if both of the following conditions are met:
An alarm was cleared when at least one of the input photocouplers for safety inputs 1 and 2 was
OFF (which means that a Safety Input Error (Alarm No. 30.0) had occurred).
At least one of the input photocouplers for safety inputs 1 and 2 was turned from OFF to ON in a
specific period during the alarm clear process (See below).
*1. Alarm No. 99.0 will occur if at least one of the input photocouplers for safety inputs 1 and 2 is turned
from OFF to ON.
Precautions for Correct Use
Be sure to clear the alarm after turning ON the photocouplers for safety inputs 1 and 2 again.
Safety input 1
Safety input 2
Alarm reset
input (RESET)
Alarm
Approx. 120 ms
Specified period
Approx. 1 ms
*1
Alarm No. 99.0
occurred
Alarm No. 30.0
occurred
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