Main circuit terminal specifications
1.4 Main circuit terminal specifications
Specification of main circuit terminal
R, S, T
AC power input
U, V, W
Power supply for
Built-in brake circuit
• The inverter will be damaged if power is applied to the inverter output terminals (U, V, W). Never
perform such wiring.
• When connecting the external brake resistor, remove jumpers across terminals PR-PX (7.5K or less).
Refer to page 105.
• When connecting the brake unit (FR-BU-C), remove jumpers across terminals PR-PX (7.5K or less).
Refer to page 12.
Connect to the commercial power supply.
Connect a three-phase squirrel-cage motor.
Connected to the AC power supply terminals R and S. To retain the alarm
display and alarm output, remove the jumpers from terminals R-R1 and S-S1
and apply external power to these terminals.
Do not turn off the power supply for control circuit (R1, S1) with the main
circuit power (R, S, T) on. Doing so may damage the inverter. The circuit
should be configured so that the main circuit power (R, S, T) is also turned off
when the power supply for control circuit (R1, S1) is off.
15K or less: 60VA, 22K to 55K: 80VA
Disconnect the jumper from terminals PR-PX (7.5K or less) and connect the
brake resistor across terminals P-PR.
For the 15K or less, connecting the resistor further provides regenerative
Connect the optional FR-BU-C brake unit.
Disconnect the jumper from terminals P-P1 and connect the power factor
When the jumper is connected across terminals PX-PR (factory setting),
the built-in brake circuit is valid. (Provided for the 7.5K or less.)
For grounding the inverter chassis. Must be grounded.