Mitsubishi Electric MELSERVO MRJ2S-B, Instruction Manual

Page: 152 / 200

Troubleshooting Alarms and Warnings
9 - 4
Display Error Definition Cause Action
10 Undervoltage Power supply
voltage dropped to
160V (servo
amplifier 200V) and
280V (servo
amplifier 400V) or
less, respecively.
1. Power supply voltage is low. Check the power
supply
2. There was an instantaneous control
circuit power failure of 60ms or longer.
3. The impedance of the power supply
is too high.
4. Main circuit power switched on
within 5s after it had switched off.
5. Faulty parts in the servo amplifier Change the servo
amplifier
12 Memory error 1 RAM, memory fault Faulty parts in the servo amplifier
Checking method: Alarm (12–15)
occurs if power is switched on after
CN1A, CN1Band CN3 connectors are
disconnected.
Change the servo
amplifier
13 Clock error Printed board fault
15 Memory error 2 E²PROM fault
16 Encoder error 1 Communication error
occurred between
encoder and servo
amplifier 1. Encoder connector (CN2)
disconnected.
Connect correctly
2. Encoder fault Change the servo
motor
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change
cable
17 Board error 2 CPU/parts fault Faulty parts in the servo amplifier
Checking method: Alarm 17 or 19
occurs if power is switched on after
CN1A, CN1B and CN3 connectors are
disconnected.
Change the servo
amplifier
19 Memory error 3 ROM, memory fault
1A Motor
combination error Wrong combination
of servo amplifier
and servo motor. Wrong combination of servo amplifier
and servo motor connected. Use correct
combination
20 Encoder error 2 Communication error
occurred between
encoder and servo
amplifier 1. Encoder connector (CN2)
disconnected
Connect correctly
2. Encoder fault Change the servo
motor
3. Encoder cable faulty
(Wire breakage or shorted)
Repair or change
cable
24 Main circuit error Connection between
load circuit and earth
potential 1. Power input wires and servo motor
output wires are in contact at main
circuit terminal block (TE1).
Connect correctly
2. Too little insulation resistance
between cable or motor and earth
potential
Change the cable
3: Main circuit of servo amplifier failed.
Checking method: Alarm 24 occurs if
the servo is switched on after
disconnecting the U, V, W power
cables from the servo amplifier.
Change the servo
amplifier
Tab. 9-2: Failure corrective action (1)