Mitsubishi Electric FATEC FR-A800 Manual page 130

7
REVIEW OF INSTALLATION ENVIRONMENT
Failure example 2: Incorrect connection of the DC reactor
[Failure]
At a motor test drive, OV was displayed and the DC reactor was burned.
[Cause]
The DC reactor was connected to terminals P/+ and PR of the brake resistor instead of P/+
and P1.
P/+ P1
DC reactor (FR-HEL)
For the 75K or higher inverters,
or whenever a 75 kW or higher
motor is used, always connect
this reactor.
The DC reactor was connected to terminals
P/+ and PR of the brake resistor instead of P/+ and P1.
The DC reactor is damaged at deceleration.
7.3 Problems and measures when using inverter
High-duty brake resistor
(FR-ABR∗)
Improves the braking capability
of the inverter built-in brake.
Remove the jumper across the
terminals PR and PX to connect
this. (7.5K or lower)
∗ It is compatible with the models with
a capabity of 22K or lower.
P/+
PR
Earth (ground)
1
2
3
4
5
6
7
8
125