For the FR-A820-03800(75K) or higher, the FR-A840-02160(75K) or higher, or whenever a 75 kW or higher motor is used, always connect a DC
reactor (FR-HEL), which is available as an option. (To select a DC reactor, refer to
When a DC reactor is connected to the FR-A820-03160(55K) or lower or the FR-A840-01800(55K) or lower, if a jumper is installed across
terminals P1 and P/+, remove the jumper before installing the DC reactor.
When using separate power supply for the control circuit, remove the jumper between R1/L11 and S1/L21.
The function of these terminals can be changed with the input terminal assignment (Pr.178 to Pr.189). (Refer to
Terminal JOG is also used as a pulse train input terminal. Use Pr.291 to choose JOG or pulse.
Terminal input specifications can be changed by analog input specification switchover (Pr.73, Pr.267). To input a voltage, set each of the voltage/
current input switch OFF. To input a current, set each of the voltage/current input switch ON. Terminals 10 and 2 are also used as a PTC input
terminal. (Pr.561) (Refer to
It is recommended to use 2 W 1 kΩ when the frequency setting signal is changed frequently.
Remove the jumper between terminals PR and PX to connect the brake resistor. (FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or
Connect a brake resistor across terminals P/+ (P3) and PR. (Terminal PR is equipped in the FR-A820-00046(0.4K) to 01250(22K), and FR-A840-
00023(0.4K) to 01800(55K).) Install a thermal relay to prevent overheating and damage of brake resistors. (Refer to
Do not connect the DC power supply (under DC feeding mode) to terminal P3.
*10 The function of these terminals can be changed with the output terminal assignment (Pr.195, Pr.196). (Refer to
*11 The function of these terminals can be changed with the output terminal assignment (Pr.190 to Pr.194). (Refer to
• To prevent a malfunction due to noise, keep the signal cables 10 cm or more away from the power cables. Also, keep the
cables of the main circuit for input and output separated.
• After wiring, wire offcuts must not be left in the inverter.
Wire offcuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in an enclosure etc., take caution not to allow chips and other foreign matter to enter the inverter.
• Set the voltage/current input switches correctly. Incorrect setting may cause a fault, failure or malfunction.
790, and select one according to the applicable motor
2. INSTALLATION AND WIRING
2.4 Terminal connection diagrams