Connection Of Stand-Alone Option Units; Connection Of The Dedicated External Brake Resistor (Fr-Abr) (Fr-A720-00900 (Fr-A740-00440) Or Less) - Mitsubishi Electric FR-A700 Instruction Manual

2.5 Connection of stand-alone option units

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 corresponding option unit manual.
2.5.1 Connection of the dedicated external brake resistor (FR-ABR)
(FR-A720-00900 (FR-A740-00440) or less)
The built-in brake resistor is connected across terminals P/+ and PR. Fit the external dedicated brake resistor (FR-
ABR) when the built-in brake resistor does not have enough thermal capability for high-duty operation. At this time,
remove the jumper from across terminals PR-PX (FR-A720-00330 (FR-A740-00170) or less) and connect the
dedicated brake resistor (FR-ABR) across terminals P/+-PR.
(For the locations of terminal P/+ and PR, refer to the terminal block layout (page 17).)
Removing jumpers across terminal PR-PX disables the built-in brake resistor (power is not supplied).
Note that the built-in brake resistor is not need to be removed from the inverter.
The lead wire of the built-in brake resistor is not need to be removed from the terminal.
Set parameters below.
⋅ Pr. 30 Regenerative function selection = "1"
⋅ Pr. 70 Special regenerative brake duty = "FR-A720-00330 (FR-A740-00170) or less: 10%, FR-A720-00460 (FR-A740-
00230) or more: 6%" (Refer to page 204)
CAUTION
1. The brake resistor connected should only be the dedicated brake resistor.
2. The jumper across terminals PR-PX (FR-A720-00330 (FR-A740-00170) or less) must be disconnected before connecting the
dedicated brake resistor. Doing so may damage the inverter.
FR-A720-00030, 00050
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.)
1) Removal of Jumper
Jumper
Terminal PX
FR-A720-00080 to 00175, FR-A740-00015 to 00090
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.)
1) Removal of Jumper
Jumper
Terminal PR
Terminal PX
2) Connection of Brake Resistor
Terminal PR
Brake resistor
2) Connection of Brake Resistor
Brake resistor

Connection of stand-alone option units

Terminal PR
Terminal P/+
P/+
Terminal
PR
Terminal
2
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