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9. TROUBLESHOOTING
9.2.2 Remedies for alarms
CAUTION
y When any alarm has occurred, eliminate its cause, ensure safety, then reset the
alarm, and restart operation. Otherwise, injury may occur.
y As soon as an alarm occurs, turn off Servo-on (SON) and power off the main
circuit .
POINT
y When any of the following alarms has occurred, always remove its cause and
allow about 15 minutes for cooling before resuming operation. If operation is
resumed by switching control circuit power off, then on to reset the alarm,
the servo amplifier and servo motor may become faulty.
x Overload 1 (A. 50)
x Overload 2 (A. 51)
y The alarm can be deactivated by switching power off, then on or by turning
on the reset signal (RES). For details, refer to Section 9.2.1.
When an alarm occurs, the trouble signal (ALM) switches off and the dynamic brake is operated to stop the
servomotor. At this time, the display indicates the alarm No.
The servo motor comes to a stop. Remove the cause of the alarm in accordance with this section. The
optional Servo Configuration Software may be used to refer to the cause.
Display Name Definition Cause Action
1. Power supply voltage is low.
2. Power failed instantaneously for
15ms or longer.
3. Shortage of power supply capacity
caused the power supply voltage to
drop at start, etc.
4. The busvoltage dropped to 15VDC
or less.
Review the power supply.
A. 10 Undervoltage Power supply
voltage dropped
5. Faulty parts in the servo amplifier
Alarm (10) occurs if power is
switched on after connectors
CN1A, CN1B, CNP2, CNP3
are disconnected.
Checking method
Change the servo amplifier.
A. 11 Board error 1 Printed board faulty
A. 12 Memory error 1 RAM, ROM memory
fault
A. 13 Clock error Printed board fault
A. 15 Memory error 2 EEPROM fault
Faulty parts in the servo amplifier
Checking method
Alarm (any of 11 to 13 and 15)
occurs if power is switched on
after disconnection of all cables
but the control circuit power
supply cables.
Change the servo amplifier.
1. Encoder connector (CNP2)
disconnected.
Connect correctly.
2. Encoder fault
Change the servo motor.
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change cable.
A. 16 Encoder error 1 Communication
error occurred
between encoder
and servo amplifier.
4. Wrong combination of servo
amplifier and servo motor
connected.
Use correct combination.