Справочник Пользователя для Mitsubishi Electronics FR-A720-0.4k to 90k

Connect the brake unit (FR-BU2) as shown below to improve the braking capability at deceleration.

*1

Connect the inverter terminals (P/+, N/-) and brake unit (FR-BU2) terminals so that their terminal names match with each other.
(Incorrect connection will damage the inverter and brake unit.)

*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-BU2 with the inverter of 7.5K or lower.

*4

Keep a wiring distance of within 5m between the inverter, brake unit (FR-BU2) and discharging resistor. Even when the wiring
is twisted, the cable length must not exceed 10m.

*5

It is recommended to install an external thermal relay to prevent overheat of discharging resistors.

*6

Refer to FR-BU2 manual for connection method of discharging resistor.

FR-BU2-1.5K

GZG 300W-50

Ω (one)

TH-N20CXHZ 1.3A

FR-BU2-3.7K

GRZG 200-10

Ω (three in series)

TH-N20CXHZ 3.6A

FR-BU2-7.5K

GRZG 300-5

Ω (four in series)

TH-N20CXHZ 6.6A

FR-BU2-15K

GRZG 400-2

Ω (six in series)

TH-N20CXHZ 11A

FR-BU2-H7.5K

GRZG 200-10

Ω (six in series)

TH-N20CXHZ 3.6A

FR-BU2-H15K

GRZG 300-5

Ω (eight in series)

TH-N20CXHZ 6.6A

FR-BU2-H30K

GRZG 400-2

Ω (twelve in series)

TH-N20CXHZ 11A

⋅ Set "1" in Pr. 0 Brake mode selection of the FR-BU2 to use GRZG type discharging resistor.
⋅ 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/-
BUE
SD

P/+

A

B
C

FR-BU2

GRZG type 
discharging resistor

External thermal 
relay

R

R

Three-phase AC 
power supply

MCCB

MC

OFF

ON

MC

T

*1

*4

*4

*2

MC

*5

*6

OCR contact

OCR

5m or less

PR
PX

*3

To the brake 
unit terminal P/+

To a resistor

TH-N20

1/L

1

5/L

3

2/T

1

6/T

3