Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 231

8. TROUBLESHOOTING
Alarm No.: A.33 Name: Overvoltage
Description
Detailed Detailed
display Name
33.1 Main circuit 1) The regenerative option is
voltage error
2) Regenerative option is not
3) Check the built-in
4) Regenerative capacity is
5) Main circuit power supply
6) Main circuit power supply
The value of the status display Pn (bus voltage) is "5" (overvoltage).
Cause
used, but the set value of
the parameter is not
correct.
used.
Lead of the built-in
regenerative resistor or the
regenerative option is
open or disconnected.
regenerative resistor
(regenerative option).
insufficient.
voltage is high.
voltage is high. (A servo
amplifier for 1-phase
100VAC input is used in
the 200VAC power supply
circuit.)
Checking method
Check the set value of Incorrect setting.
parameter No.PA02.
Correct setting.
Check the wiring and Open or
the lead of the built-in disconnected.
regenerative resistor
No problem.
(regenerative option).
Check the resistance Error in the built-in
value. regenerative resistor
(regenerative
option).
No problem.
Check if alarm occurs Alarm does not
when the deceleration occur.
time constant is
increased.
Alarm occurs.
Check if the main MR-JN- A: Above
circuit power supply 253VAC
voltage is the following MR-JN- A1: Above
or above. 132VAC
MR-JN- A: 253VAC
MR-JN- A: 253VAC
MR-JN- A1: 132VAC
or less
MR-JN- A1:
132VAC or less
Check the model of The model of servo
servo amplifier. amplifier is "MR-JN-
A1".
8 - 14
Result Action
Correct the set value.
Check 2).
Connect correctly.
Check 3).
When using the built-in
regenerative resistor,
replace the servo
amplifier.
When using the
regenerative option,
replace the regenerative
option.
Check 4).
Use the regenerative
option if it is not used.
Increase the deceleration
time constant.
Check 5).
Reduce the main circuit
power supply voltage.
Check 6).
The servo amplifier may
malfunction due to the
voltage input different from
the power specification.
Replace the servo
amplifier with a "MR-JN-
A" model.