Connection Of Stand-Alone Option Units - Mitsubishi Electric FR-F802-E Instruction Manual

Connection of stand-alone option units

2.8
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.
2.8.1
Connection of the brake unit (FR-BU2)
Connect the brake unit (FR-BU2) as shown below to improve the braking capability during deceleration.
After wiring securely, set Pr.30 Regenerative function selection = "11" .
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 = "11" .
• For the parameter details, refer to the FR-F800 Instruction Manual (Detailed).
52
INSTALLATION AND WIRING
MCCB MC
R/L1
S/L2
T/L3
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 wiring to terminals P/+ and N/- of the FR-F842-08660(400K) or lower inverters, up to two cables can
be connected. For wiring to the terminals of the FR-F842-09620(450K) or higher inverters, 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.
∗3
T
ON
Motor
U
V
M
MC
W
10 m or less
∗1, ∗2
P/+
P
P
N/- N
PR
BUE
A
SD
B
C
Brake unit
FR-BU2
OFF CR1 CR2 CR3 CR4
MC
∗4
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