29
Connection of stand-alone option unit
2.4.2
Connection of the brake unit (FR-BU2)
Connect the brake unit (FR-BU2) as shown below to improve the braking capability at deceleration. If the transistors in the
brake unit should become faulty, the resistor can be unusually hot. To prevent unusual overheat and fire, install a magnetic
contactor on the drive unit's input side to configure a circuit so that a current is shut off in case of fault.
(1) Connection example with the GRZG type discharging resistor
<Recommended external thermal relay>
Connect the drive unit terminals (P/+ and N/-) and brake unit (FR-BU2) terminals so that their terminal names match with each other.
(Incorrect connection will damage the drive unit and brake unit.)
When the power supply is 400V class, install a step-down transformer.
The wiring distance between the drive unit, brake unit (FR-BU2) and discharging resistor should be within 5m.
Even when the wiring is twisted, the cable length must not exceed 10m.
It is recommended to install an external thermal relay to prevent overheat of discharging resistor.
Refer to FR-BU2 manual for connection method of discharging resistor.
Brake Unit
Discharging Resistor
Recommended External
Thermal Relay
FR-BU2-1.5K
GZG 300W-50
(one)
TH-T25-1.3A
FR-BU2-3.7K
GRZG 200-10
(three in series)
TH-T25-3.6A
FR-BU2-H7.5K
GRZG 200-10
(six in series)
TH-T25-3.6A
NOTE
Set "1" in
Pr. 0 Brake mode selection
of the FR-BU2 to use GRZG type discharging resistor.
Do not remove the jumper across terminals P/+ and P1 except when connecting a DC reactor (FR-HEL).
U
V
W
P/+
N/-
R/L1
S/L2
T/L3
IM
PR
N/-
BUE
SD
P/+
A
B
C
FR-BU2
R
R
Three-phase AC
power supply
MC
OFF
ON
MC
T
MC
OCR
Drive unit
10m or less
Motor
External thermal
relay
GRZG type
discharging resistor
OCR contact
MCCB
To the brake
unit terminal P/+
To a resistor
1/L
1
5/L
3
2/T
1
6/T
3
Содержание FR-D720-0.2K-G
Страница 45: ...34 MEMO ...
Страница 293: ...290 MEMO ...
Страница 294: ...291 APPENDIX This chapter provides the APPENDIX of this product Always read the instructions before using the equipment ...