Mitsubishi Electric FR-A800 Instruction Manual page 61

Connection of stand-alone option units
Connection example with the FR-BR-(H) resistor unit
Three phase AC
power supply
NOTE
• Do not remove the jumper across terminals P/+ and P1.
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.
Three phase
AC power
supply
NOTE
• The stall prevention (overvoltage), oL, does not occur while Pr.30 Regenerative function selection = "1" and Pr.70 Special
regenerative brake duty = "0% (initial value)". (Refer to the FR-A800 Instruction Manual (Detailed).)
60
INSTALLATION AND WIRING
MCCB
MC

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 resistor unit (FR-BR) must be within 5 m. Even when the wires are 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.
MCCB
MC

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 resistor unit (MT-BR5) must be within 5 m. 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.
T ∗2
MC
Motor
U
R/L1
S/L2 V
M
W
T/L3
∗3
Inverter
P/+
∗1
N/-
∗3
10m or less
∗2
T
ON
Motor
R/L1 U
V
S/L2 M
MC
T/L3 W
∗1
P/+ P
N/- N P
∗3
PR
BUE
SD
Inverter
Brake unit
∗5
FR-BU2
ON OFF
MC
FR-BR
∗4
P TH1
PR
TH2
FR-BU2
PR
A
P/+
B
N/- C
BUE
SD
OFF CR1
MC
∗3
10m or
∗4
less
CR1
P TH1
PR
TH2
Resistor unit
MT-BR5