Mitsubishi FR-BU2-1.5K - Page 24

17
WIRING
• External connection diagram 2 (When connecting an external thermal
relay)
<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.)
Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
*2 When the power supply is 400V class, install a step-down transformer.
*3 When using the FR-BU2 with the FR-A500, A700 series inverter 7.5K or less or FR-V500 series
inverter 5.5K or less, be sure to remove a jumper across terminal PR and PX.
*4 Keep a wiring distance of within 5m between the inverter, brake unit (FR-BU2)and brake 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 brake resistors.
Brake Unit Brake Resistor
Recommended External
Thermal Relay
FR-BU2-1.5K
GZG 300W-50Ω TH-N20 1.3A
FR-BU2-3.7K
GRZG 200-10Ω TH-N20 3.6A
FR-BU2-7.5K
GRZG 300-5Ω TH-N20 6.6A
FR-BU2-15K
GRZG 400-2Ω TH-N20 11A
FR-BU2-H7.5K
GRZG 200-10Ω TH-N20 3.4A
FR-BU2-H15K
GRZG 300-5Ω TH-N20 6.6A
FR-BU2-H30K GRZG 400-2Ω TH-N20 11A
CAUTION
To replace the existing BU type brake unit, set "1" in Pr.0 Brake mode switchover.
(Refer to page 33. )
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
brake registor
External
thermal
relay
R
Three
phase
A
C
power
supply
MCCB MC
MC
OFF
ON
MC
T
*5
PR
PX
*1
5m or less
*4
*4
*3
*2
R