Справочник Пользователя для Mitsubishi Electronics FR-A700

When connecting the brake unit (FR-BU(H)/MT-BU5) to improve the brake capability at deceleration, make connection
as shown below.
(1) Connection with the FR-BU (55K or lower)

*1

Connect the inverter terminals (P/+, N/-) and brake unit (FR-BU (H)) terminals so that their terminal signals match with each other.
(Incorrect connection will damage the inverter.)

*2

When the power supply is 400V class, install a step-down transformer.

*3

Be sure to remove the jumper across terminals PR and PX when using the FR-BU with the inverter of 7.5K or lower.

*4

The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR) should be within 5m. If twisted wires are
used, the distance should be within 10m.

⋅ If the transistors in the brake unit should become faulty, the resistor can be unusually hot, causing a fire. Therefore, install a

magnetic contactor on the inverter's input side to configure a circuit so that a current is shut off in case of fault.

⋅ Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.

U

V

W

P/+

N/

−

R/L1

S/L2

T/L3

Motor

IM

Inverter

PR

N/

−

P/+

P

HA

HB

HC

FR-BU

FR-BR

TH2

TH1

PR

*1

Three-phase AC 

power supply

MCCB

MC

OFF

ON

MC

T 

*2

MC

*3

PR

PX

*4

5m or less