Connection Of Stand-Alone Option Units; Connection Of The Brake Unit (Fr-Bu2) - Mitsubishi Electric FR-CS82S-025 Instruction Manual

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 Instruction Manual of the corresponding option unit.
2.8.1

Connection of the brake unit (FR-BU2)

Connect the brake unit (FR-BU2(H)) as follows to improve the braking capability during deceleration.
 Connection example with the GRZG type discharging resistor
Three-phase AC
power supply
*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 When the power supply is 400 V class, install a stepdown transformer.
*3 The wiring distance between the inverter,
the wiring length must be within 10 m.
*4 It is recommended to install an external thermal relay to prevent overheat of the discharging resistor.
*5 For the connection method of the discharging resistor, refer to the Instruction Manual of the FR-BU2.
• Recommended external thermal relay
Brake unit
FR-BU2-1.5K
FR-BU2-3.7K
FR-BU2-7.5K
FR-BU2-15K
FR-BU2-H7.5K
FR-BU2-H15K
FR-BU2-H30K
NOTE
• Set "1" in Pr.0 Brake mode selection in the FR-BU2 to use a GRZG type discharging resistor.
42
2. INSTALLATION AND WIRING
2.8 Connection of stand-alone option units
MCCB MC
brake unit (FR-BU2)
Discharging resistor
GZG 300W-50Ω (one)
GRZG 200-10Ω (three in series) TH-T25-3.6A
GRZG 300-5Ω (four in series)
GRZG 400-2Ω (six in series)
GRZG 200-10Ω (six in series)
GRZG 300-5Ω (eight in series)
GRZG 400-2Ω (twelve in series) TH-T25 11A
T
*2
MC
Motor
U
R/L1
External thermal
relay
S/L2 V
IM
W
T/L3
*3
Inverter
P/+
*1
N/-
*3
10 m or less
, and discharging resistor must be within 5 m. Even when the cable is twisted,
Recommended external
thermal relay
TH-T25-1.3A
TH-T25-6.6A
TH-T25-11A
TH-T25-3.6A
TH-T25-6.6A
OCR contact
ON OFF
MC
GRZG type
discharging resistor
OCR
*5
R R
*4
FR-BU2
PR
A
P/+ B
N/- C
BUE
SD
1/L 5/L
1 3
2/T 6/T
1 3
To the brake To a resistor
unit terminal P/+