Connection Of Stand-Alone Option Units - Mitsubishi Electric A800-GF Instruction Manual

2.10

Connection of stand-alone option units

The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the option unit carefully in accordance with
the corresponding option unit manual.
2.10.1
Connection of the brake unit (FR-BU2)
Connect the brake unit (FR-BU2) as shown below to improve the braking capability during deceleration.
After making sure that the wiring is correct and secure, set "11 or 111" in Pr.30 Regenerative function selection.
Set Pr.0 Brake mode selection = "2" in the brake unit FR-BU2.
MCCB
Three phase
AC power
supply






NOTE
• The warning "oL" of the stall prevention (overvoltage) is disabled while Pr.30 Regenerative function selection = "11 or 111".
• For the parameter details, refer to the FR-A800 Instruction Manual (Detailed).
T
MC
R/L1 U
V
S/L2
T/L3 W
P/+
N/-
Inverter/
converter
∗6
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.)
For the FR-A842-08660(355K) or lower, up to two cables can be connected to terminals P/+ and N/-. For the
FR-A842-09620(400K) or higher, up to four cables can be connected. To use more cables, use a bus bar.
When the power supply is 400 V class, install a stepdown transformer.
The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (MT-BR5) must be within 5 m
each. Even when the cable is twisted, the wiring 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.
Connection of stand-alone option units
∗3
ON OFF
Motor
M
MC
10 m or less
∗1∗2
∗4
P
P
N
PR
BUE
A
SD
B
C
Brake unit
FR-BU2
INSTALLATION AND WIRING
CR1 CR2 CR3 CR4
MC
CR1
TH1
P
PR
∗5
TH2
Resistor unit
MT-BR5
CR2
TH1
P
PR
∗5
TH2
Resistor unit
MT-BR5
CR3
TH1
P
PR
∗5
TH2
Resistor unit
MT-BR5
CR4
TH1
P
PR
TH2 ∗5
Resistor unit
MT-BR5
2
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