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Connection of stand-alone option units
2.5.2 Connection of the brake unit (FR-BU2)
Connect the brake unit (FR-BU2) as shown below to improve the braking capability at deceleration.
(1) Connection example with the GRZG type discharging resistor
<Recommended external thermal relay>
*1 Connect the inverter terminals (P/+, N/-) and brake unit (FR-BU2) terminals so that their terminal names match with each other.
(Incorrect connection will damage the inverter and brake unit.)
*2 When the power supply is 400V class, install a step-down transformer.
*3 Be sure to remove the jumper across terminals PR and PX when using the FR-BU2 with the inverter of 7.5K or lower.
*4 Keep a wiring distance of within 5m between the inverter, brake unit (FR-BU2) and discharging resistor. Even when the wiring
is twisted, the cable length must not exceed 10m.
*5 It is recommended to install an external thermal relay to prevent overheat of discharging resistors.
*6
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-50Ω (one) TH-N20CXHZ 1.3A
FR-BU2-3.7K
GRZG 200-10Ω (three in series) TH-N20CXHZ 3.6A
FR-BU2-7.5K
GRZG 300-5Ω (four in series) TH-N20CXHZ 6.6A
FR-BU2-15K
GRZG 400-2Ω (six in series) TH-N20CXHZ 11A
FR-BU2-H7.5K
GRZG 200-10Ω (six in series) TH-N20CXHZ 3.6A
FR-BU2-H15K
GRZG 300-5Ω (eight in series) TH-N20CXHZ 6.6A
FR-BU2-H30K
GRZG 400-2Ω (twelve in series) TH-N20CXHZ 11A
CAUTION
⋅ Set "1" in Pr. 0 Brake mode selection of the FR-BU2 to use GRZG type discharging resistor.
⋅ Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
U
V
W
P/+
N/-
R/L1
S/L2
T/L3
Motor
IM
Inverter
PR
N/-
BUE
SD
P/+
A
B
C
FR-BU2
GRZG type
discharging resistor
External thermal
relay
RR
Three-phase AC
power supply
MCCB
MC
OFFON
MC
T
*1
*4
*4
*2
MC
*5
*6
OCR contact
OCR
5m or less
PR
PX
*3
To the brake
unit terminal P/+
To a resisto
r
TH-N20
1/L1 5/L3
2/T1 6/T3