Connection Of Stand-Alone Option Units; Connection Of The Brake Resistor - Mitsubishi Electric FR-A800 Series Instruction Manual

2.10
The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the option unit carefully in accordance with
the Instruction Manual of the corresponding option unit.

2.10.1 Connection of the brake resistor

• When an inverter-driven motor is driven by a load or requires rapid deceleration, install an external brake resistor. Connect
the brake resistor to terminals P/+(P3) and PR. (For the locations of terminal P/+(P3) and PR, refer to the terminal block
layout (page
• For the FR-A820-00490(7.5K) or lower and the FR-A840-00250(7.5K) or lower, the plug-in brake resistor is connected to
terminals P/+ and PX.
When the plug-in brake resistor does not have enough thermal capability for high-duty operation, install an external brake
resistor. At this time, remove the jumper across terminals PR and PX and connect the brake resistor to terminals P/+ and
PR. terminal block layout
Removing jumpers across terminals PR and PX disables the plug-in brake resistor (power is not supplied). The plug-in
brake resistor can be left connected to the inverter, and so is the plug-in brake resistor's lead wire connected to the
terminal.
FR-A820-00046(0.4K), FR-A820-00077(0.75K)
1) Remove the screws in
terminals PR and PX
and remove the jumper.
2) Connect the brake resistor
across terminals P/+ and PR.
(The jumper should remain
disconnected.)
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Connection of stand-alone option units

55).)
(page 55).)
Terminal PX
Terminal P/+
Brake resistor
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FR-A820-00105(1.5K) to FR-A820-00250(3.7K)
FR-A840-00023(0.4K) to FR-A840-00126(3.7K)
1) Remove the screws in terminals
PR and PX and remove the jumper.
Jumper
Terminal PR
Terminal PR
2) Connect the brake resistor
across terminals P/+ and
PR. (The jumper should
remain disconnected.)
Jumper
Terminal PX
Terminal P/+
Terminal PR
Brake resistor
2. INSTALLATION AND WIRING
2.10 Connection of stand-alone option units
1
2
3
4
5
6
7
8
9
Terminal PR
10
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