538
SELECTION
(3) BU type brake unit and discharging
resistor
1) Installation position
For the installation position of the discharging
resistor, refer to paragraph (2), part 1).
2) Wiring
(a) When wiring the brake unit (BU type) and
discharging resistor, note high DC voltage
application and discharging resistor-
generated heat.
(b) Minimize the cable length between the
inverter and brake unit and the discharging
resistor and brake unit. If it exceeds 2m, twist
the cables. (If twisted, the distance must not
exceed 5m)
(c) When wiring the discharging resistor, the
resistor-generated heat (maximum surface
temperature is approximately 150 to 300 )
must be taken into consideration.
• Take measures to prevent the cables
from making contact with the resistor.
• Use heat-resistant cables (such as
glass-braided cables), or cover the
cables with silicone tubes.
(d) Use cables of the size below or larger size.
(e) Connect the cables so that the terminal
symbols of the brake unit match those of the
inverter. When the FR-HEL power-factor
improving reactor has been connected, do not
connect the brake unit to terminal P1 to
protect the brake unit from damage.
(f) If the transistors in the brake unit become
faulty, the resistor can be unusually hot,
causing a fire. Therefore, install a magnetic
contactor on the inverter's input side to
configure a circuit so that a current is shut off
in case of fault.
(4) FR-BU2/FR-BU/MT-BU5 brake unit and
resistor unit
1) Installation position
Always install the brake unit and resistor unit on a
vertical surface in the vertical direction. Installing
them in the horizontal direction or on a horizontal
surface reduces the heat dissipation effect.
Since the case temperature of the resistor unit
rises to or above 100 (the temperature rise of
the brake resistor of the MT-BU5 is 300K), install
the unit in a place where it will not make contact
with cables and flammables.
2) Wiring
(a) When wiring the brake unit (FR-BU2/FR-BU/
MT-BU5) and resistor unit, note high DC
voltage application and resistor unit generated
heat.
(b) Minimize the cable length between the
inverter and brake unit and the resistor unit
and brake unit. Use a twisted cable when the
wiring length exceeds 5m.
(Even when the wiring is twisted, the cable
length must not exceed 10m.)
Cables applicable to the BU brake unit
BU Brake Unit Type
Cable Size
200V
BU-1500, 3700
2mm
2
BU-7.5K, 15K
3.5mm
2
400V
BU-H7.5K
2mm
2
BU-H15K, H30K
3.5mm
2
P
N
P
N PR
Inverter
Brake
unit
2m or less
P
N
P
N
PR
2m or less
5m or less
5m or less
Inverter
Brake
unit
Discharging
resistor
Discharging
resistor
Wiring the BU brake unit
P
N
P
N
P1
P
N
P
N
FR-
HEL
Brake unit
Brake unit
Incorrect connection examples
P
N
P
N PR
P
N
P
N
PR
PR
P
PR
P
*
*
The MT-BU5 is installed within a distance of
the supplied cable (P, N, drive signal) reaches
the inverter.
Refer to the inverter manual.
Inverter
Brake
unit
5m or less
Inverter
Brake
unit
5m or less
Resistor
unit
Resistor
unit
10m or less
10m or less
*
Wiring the FR-BU2/FR-BU/MT-BU5 brake unit
Содержание FR-A700 Series
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