Mitsubishi Electric FR-F820-00077 Instruction Manual page 100

Connection of stand-alone option units
NOTES 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 except when connecting a DC reactor
(FR-HEL).
Connection example with the FR-BR-(H) resistor unit
Fig. 2-49:
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.)
When the power supply is 400 V class, install a stepdown transformer.
The wiring distance between the inverter and brake unit (FR-BU2), and between the brake unit
(FR-BU2) and resistor unit (FR-BR) must be within 5 m each. Even when the wire is twisted, the cable
length must be within 10 m.
The contact between TH1 and TH2 is closed in the normal status and is open at a fault.
NOTE Do not remove the jumper across terminals P/+ and P1 except when connecting a DC reactor
(FR-HEL).
2 - 72
MCCB
Three-phase AC
power supply
Connection example with the FR-BR-(H) resistor unit
T
MC
Motor
U
R/L1
S/L2 V
W
T/L3
Inverter
P/+
N/-
≤ 10 m
Installation and wiring
ON OFF
MC
MC
FR-BR
P
TH1
M
PR
TH2
FR-BU2
PR
A
P/+ B
N/- C
BUE
SD
I002409E_B