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Connection Of Stand-alone Option Units; Connection Of The Brake Unit (fr-bu2) - Mitsubishi Electric FR-A800 Instruction Manual

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2.10

Connection of stand-alone option units

The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the option unit carefully in accordance with
the corresponding option unit manual.
2.10.1

Connection of the brake unit (FR-BU2)

Connect the brake unit (FR-BU2(H)) as shown below to improve the braking capability during deceleration.
Connection example with the GRZG type discharging resistor
Three-phase AC
power supply





• Recommended external thermal relay
Brake unit
FR-BU2-H7.5K
FR-BU2-H15K
FR-BU2-H30K
NOTE
• Set "1" in Pr.0 Brake mode selection of the FR-BU2 to use a GRZG type discharging resistor.
• Do not remove the jumper across terminals P/+ and P1.
MCCB
MC
R/L1
S/L2
T/L3
Inverter
∗1
When wiring, make sure to match the terminal symbol (P/+, N/-) at the inverter side and at the brake unit (FR-BU2) side.
(Incorrect connection will damage the inverter and brake unit.)
Install a stepdown transformer.
The wiring distance between the inverter and brake unit (FR-BU2), and between the brake unit (FR-BU2) and
discharging resistor must be within 5 m. Even when the wires are twisted, the cable length must be within 10 m.
It is recommended to install an external thermal relay to prevent overheat of the discharging resistor.
For the connection method of the discharging resistor, refer to the Instruction Manual of the FR-BU2.
Discharging resistor
GRZG 200-10Ω
(six in series)
GRZG 300-5Ω
(eight in series)
GRZG 400-2Ω
(twelve in series)
Connection of stand-alone option units
ON
∗2
T
MC
MC
GRZG type
discharging
OCR
resistor
R
Motor
U
External thermal
∗4
relay
V
M
W
FR-BU2
∗3
PR
P/+
P/+
∗1
N/-
N/-
BUE
SD
∗3
10m or less
Recommended
external thermal relay
TH-N20CXHZ 3.6A
TH-N20CXHZ 6.6A
TH-N20CXHZ 11A
INSTALLATION AND WIRING
OCR
contact
OFF
∗5
R
A
B
C
1/L
5/L
1
3
TH-N20
2/T
6/T
1
3
To a resistor
To the brake
unit terminal P/+
2
59

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