Mitsubishi Electric FR-A720-0.4K Instruction Manual page 45

Connection of stand-alone option units
(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 the jumper across terminals PR and PX when using the FR-BU with the inverter of 7.5K or lower.
*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 The contact between TH1 and TH2 is closed in the normal status and is open at a fault.
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
After making sure that the wiring is correct, set the following parameters:
Pr. 30 Regenerative function selection = "1"
Pr. 70 Special regenerative brake duty = "0 (initial value)"
Set Pr. 0 Brake mode selection = "2" in the brake unit FR-BU2.
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 The contact between TH1 and TH2 is open in the normal status and is closed at a fault.
*5 CN8 connector used with the MT-BU5 type brake unit is not used.
CAUTION
⋅ The stall prevention (overvoltage), oL, does not occur while Pr.30 Regenerative function selection = "1" and Pr.70 Special
regenerative brake duty = "0% (initial setting)."
38
MCCB MC
MCCB
MC
R/L1
S/L2
T/L3
Inverter
T
*2
MC
Motor
U
R/L1
S/L2 V IM
W
T/L3
*4
Inverter
PR
P/+
*3
PX
*1
N/-
5m or less
*2
T
Motor
U
IM
V
W
P/+
P
*1
*1
N/-
N
*3
BUE
SD
Brake unit
*5
FR-BU2
ON OFF
MC
FR-BR
P TH1
*5
PR
TH2
FR-BU2
PR
A
P/+ B
*1
N/- C
BUE
SD
*4
ON OFF CR1
MC
MC
*3
5m or less
TH1
P
P
PR
PR
TH2
Resistor unit
MT-BR5
CR1
*4