Mitsubishi Electric FR-A700 Instruction Manual page 87

Wiring
Connection with the brake unit MT-BU5 (02160 or more)
After making sure that the wiring is correct, set "1" in Pr. 30 "Regenerative function selection"
and "10%" in Pr. 70 "Special regenerative brake duty". (Refer to section 6.13.2.)
3-phase AC
power supply
Fig. 3-36: Connection with the brake unit MT-BU5
If the control contacts are only specified for 230V control power you must install a transformer
when using a 400V power supply.
The wiring distance between the inverter, brake unit and resistor unit should be within 5m.
If twisted wires are used, the distance should be within 10m.
b
CAUTION:
● Install the brake unit in a place where a cooling air reaches the brake unit heatsink
and within a distance of the cable supplied with the brake unit reaches the inverter.
● For wiring of the brake unit and inverter, use an accessory cable supplied with the
brake unit. Connect the main circuit cable to the inverter terminals P/+ and N/ − and
connect the control circuit cable to the CN8 connector inside by making cuts in the
rubber bush at the top of the inverter for leading the cable.
● The brake unit which uses multiple resistor units has terminals equal to the number
of resistor units. Connect one resistor unit to one pair of terminal (P, PR).
FR-A700 EC
Connection of stand-alone option units
Inverter
ON
Brake unit
MT-BU5
OFF
≤ 5m
Resistor unit
MT-BR5
I001347E
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