Connection Of Stand-Alone Option Units; Connection Of The Dedicated External Brake Resistor (Fr-Abr) (22K Or Less) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Connection of stand-alone option units

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)
(22K 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 (7.5K 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 16).)
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 = "7.5K or less: 10%, 11K or more: 6%" (Refer to page 198)
CAUTION
1. The brake resistor connected should only be the dedicated brake resistor.
2. The jumper across terminals PR-PX (7.5K or less) must be disconnected before connecting the dedicated brake resistor.
Doing so may damage the inverter.
FR-A720-0.4K, 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.)
1) Removal of Jumper
Terminal PX
FR-A720-1.5K to 3.7K, FR-A740-0.4K to 3.7K
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
Terminal PX
42
2) Connection of Brake Resistor
Jumper
Terminal PR
2) Connection of Brake Resistor
Jumper
Terminal PR
Terminal PR
Terminal P/+
Brake resistor
Terminal P/+
PR
Terminal
Brake resistor