Mitsubishi Electric FR-A800, Instruction Manual

Page: 114 / 1042

Connection of stand-alone option units Installation and wiring
2 - 84
Connection example with the MT-BR5 type resistor unit
After wiring securely, set Pr. 30 "Regenerative function selection"= "1" and Pr. 70 "Special regenerative
brake duty" = "0 (initial value)".
Set Pr. 0 "Brake mode selection" = "2" in the brake unit FR-BU2.
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 (MT-BR5) 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 open in the normal status and is closed at a fault.
,
The CN8 connector used with the MT-BU5 type brake unit is not used.
I002410E
Fig. 2-61: Connection example with the MT-BR5 type resistor unit
NOTE The stall prevention (overvoltage), oL, does not occur while Pr. 30 "Regenerative function selec-
tion" = "1" and Pr. 70 "Special regenerative brake duty" = "0% (initial value)." (Refer to page 5-675.)
MC
R/L1
M
S/L2
T/L3
U
V
P/+
N/-
P
PR
W
MCCB
TH1
TH2
MC
CR1
MC
CR1
T
*2
P
N
BUE
SD
P
PR
Three-phase AC
power supply
≤
10m
ON OFF
Motor
Inverter
,
#
Brake unit
FR-BU2
Resistor unit
MT-BR5