Connection of the brake unit (FR-BU2). Mitsubishi Electric FR-F806-E-L2 (IP55/UL Type 12
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Connection of stand-alone option units
2.9
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.
2.9.1
Connection of the brake unit (FR-BU2)
Connect the brake unit (FR-BU2(H)) as shown below to improve the braking capability during deceleration.
Connection example with the GRZG type discharging resistor
OFF
OCR contact
ON
T ∗2
Three-phase AC power supply
MCCB MC
R/L1
S/L2
T/L3
U
V
W
MC MC
Motor
M
OCR
GRZG type discharging resistor
R R
External thermal relay ∗4
∗5
Inverter
∗1
P/+
N/-
∗3
FR-BU2
PR
A
P/+
N/-
∗1
BUE
SD
B
C
∗3
10 m or less
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 discharging resistor must be within 5 m. Even when the wires are twisted, the cable length must be within 10 m.
It is recommended to install an external thermal relay to prevent overheat of the discharging resistor.
For the connection method of the discharging resistor, refer to the Instruction Manual of the FR-BU2.
• Recommended external thermal relay
1/L
1
5/L
3
Brake unit Discharging resistor
Recommended external thermal relay
FR-BU2-H7.5K
FR-BU2-H15K
FR-BU2-H30K
GRZG 200-10 Ω
(six in series)
GRZG 300-5 Ω
(eight in series)
GRZG 400-2 Ω
(twelve in series)
TH-T25-3.6A
TH-T25-6.6A
TH-T25-11A
2/T
1
To the brake unit terminal P/+
6/T
3
To a resistor
2
NOTE
• Set "1" in Pr.0 Brake mode selection of the FR-BU2 to use a GRZG type discharging resistor.
• Do not remove the jumper across terminals P/+ and P1.
51
Connection of stand-alone option units
Connection example with the FR-BR-(H) resistor unit
ON OFF
T ∗2
MC MC
FR-BR
MCCB MC
Three phase AC power supply
R/L1
S/L2
T/L3
U
V
W
Motor
M
P
PR
TH1 ∗4
TH2
∗3
Inverter
P/+
N/-
∗1
FR-BU2
PR
A
P/+
N/-
BUE
SD
B
C
∗3
10 m or less
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.
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".
Set Pr.0 Brake mode selection = "2" in the brake unit FR-BU2.
Τ ∗2
Three phase
AC power supply
MCCB MC
R/L1
S/L2
T/L3
U
V
W
P/+
N/-
Inverter
∗5
ON OFF CR1
∗1
∗3
Motor
M
MC
P
N
BUE
SD
P
PR
A
B
C
Brake unit
FR-BU2
10 m or less
∗3
MC
P
PR
∗4
TH1
TH2
Resistor unit
MT-BR5
CR1
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.
NOTE
• The stall prevention (overvoltage), oL, does not occur while Pr.30 Regenerative function selection = "1". (Refer to the FR-
F800 Instruction Manual (Detailed).)
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