Mitsubishi Electric FR-A740-00023 Instruction Manual page 51

(2) FR-BR-(H) connection example with resistor unit
Three phase AC
power supply
*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 a jumper across terminal PR-PX when using the FR-BU with the inverter of 00250 or less.
*4 The wiring distance between the inverter, brake unit (FR-BU) and resistor unit (FR-BR) should be within 5m. Even when the
wiring is twisted, the cable length must not exceed 10m.
*5 Normal: across TH1-TH2...close, Alarm: across TH1-TH2...open
CAUTION
⋅ Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
(3) Connection example with MT-BR5 type resistor unit
Three phase AC
power supply
*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 The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (MT-BR5) should be within 5m. If twisted wires
are used, the distance should be within 10m.
*4 Normal: across TH1-TH2...open, Alarm: across TH1-TH2...close
*5 CN8 connector used with the MT-BU5 type brake unit is not used.
CAUTION
⋅ When replacing the existing MT-BU5 type brake unit, set "2" in Pr. 0 Brake mode selection of the FR-BU2, "1" in Pr. 30 Regenerative
function selection and "10%" in Pr. 70 Special regenerative brake duty (refer to page 198) of the inverter.
MCCB MC
R/L1
S/L2
T/L3
Inverter
PR
*3
PX
T
*2
MCCB
MC
R/L1 U
V
S/L2
T/L3 W
P/+
N/-
Inverter
*5
Connection of stand-alone option units
ON
T
*2
MC
MC
FR-BR
Motor
U
P TH1
V IM
PR
W
TH2
*4
FR-BU2
PR
P/+ P/+
*1
N/- N/-
BUE
SD
*4
5m or less
ON OFF CR1
Motor
IM
MC
MC
*3
5m
or less
*1
P
N P
P
*3
PR
BUE PR
SD
Brake unit Resistor unit
FR-BU2 MT-BR5
OFF
*5
A
B
C
*4
TH1
CR1
TH2
41
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