24
WIRING
3.6 Connection Example with MT-BR5 Type Resistor
Unit
Make up a sequence which always shuts off power in the input side by an
overheat signal of the built-in thermal relay of the resistor unit in case a built-
in transistor of the brake unit is damaged and configure a circuit which
prevents abnormal overheat of the brake resistor leading to burnout. The
external connection diagram is shown below.
3.6.1
When connecting one inverter and one brake unit
*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
The wiring distance between the inverter, brake unit (FR-BU2) and resistor unit (MT-BR5)
should be within 5m. If twisted wires are used, the distance should be within 10m.
*4
Normal: across TH1-TH2...open, Alarm: across TH1-TH2...close
*5
CN8 connector used with the MT-BU5 type brake unit is not used.
CAUTION
When replacing from the exisiting MT-BU5 type brake unit, set "2" in
Pr.0 Brake
mode switchover (refer to page 33)
, "1" in
Pr.30 Regenerative function selection
and
"10%"
in
Pr.70 Special regeneration brake duty
(refer to the inverter manual)
of the
inverter.
MT-BR5
MT-BR5
MC
R/L1
Motor
IM
Inverter
S/L2
T/L3
U
V
P/+
N/-
P
PR
5m
or less
W
Three
phase
AC
power
supply
MCCB
TH1
TH2
MC
CR1
OFF
ON
MC
CR1
T
*3
*1
*3
*5
*4
P
N
BUE
SD
P
PR
Brake unit
FR-BU2
Registor unit
MT-BR5
*2
Содержание FR-BU2-1.5K
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