Connection of stand-alone option units
66
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 wiring securely, set
Pr.30 Regenerative function selection
= "11 or 111" .
Set
Pr.0 Brake mode selection
= "2" in the brake unit FR-BU2.
NOTE
• The stall prevention (overvoltage), oL, does not occur while
Pr.30 Regenerative function selection
= "11 or 111" .
• For the parameter details, refer to the FR-A800 Instruction Manual (Detailed).
∗1
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.)
∗2
For wiring to terminals P/+ and N/- of the FR-A842-08660(355K) or lower inverters, up to two cables can
be connected. For wiring to the terminals of the FR-A842-09620(400K) or higher inverters, up to four
cables can be connected. To use more cables, use a bus bar.
∗3
When the power supply is 400 V class, install a stepdown transformer.
∗4
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.
∗5
The contact between TH1 and TH2 is open in the normal status and is closed at a fault.
∗6
The CN8 connector used with the MT-BU5 type brake unit is not used.
P
PR
10 m or less
TH1
TH2
CR1
P
N
BUE
SD
P
PR
Brake unit
FR-BU2
Resistor unit
MT-BR5
TH1
TH2
Resistor unit
MT-BR5
P
PR
TH1
TH2
Resistor unit
MT-BR5
P
PR
MC
R/L1
Motor
M
Inverter with
converter unit
S/L2
T/L3
U
V
P/+
N/-
W
Three phase
AC power
supply
MCCB
MC
OFF
ON
MC
CR1
T
CR2
CR4
CR2 CR3 CR4
A
B
C
∗4
∗5
∗5
∗5
∗5
∗1
,
∗2
∗3
TH1
TH2
Resistor unit
MT-BR5
P
PR
CR3
∗6
Summary of Contents for FR-A842-07700
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