Mitsubishi Electric FR-A820-00046 Instruction Manual page 62

Terminal connection diagrams
For the FR-A820-03800(75K) or higher, the FR-A840-02160(75K) or higher, or when using a motor
with a capacity of 75 kW or higher, always connect a DC reactor (FR-HEL), which is available as an
option. (To select a DC reactor, refer to page 8-1, and select one according to the applicable motor
capacity.)
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 the 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 page 5-439.)
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 the voltage/current input switch OFF. To input a current, set the
voltage/current input switch ON. (Refer to page 5-406.)
It is recommended to use 2 W, 1 kΩ when the frequency setting signal is changed frequently.
Remove the jumper between PR and PX to connect the brake resistor. (FR-A820-00490(7.5K) or
lower and FR-A840-00250(7.5K) or lower).
Connect a brake resistor across terminals P/+ (P3) and PR. The terminal PR is equipped in the
FR-A820-01250(22K) or lower and FR-A840-01800(55K) or lower. Install a thermal relay to prevent
overheating and damage of discharging resistors. (Refer to page 2-87.)
Do not connect the DC power supply (under DC feeding mode) to terminal P3.
The function of these terminals can be changed with the output terminal assignment (Pr. 195,
Pr. 196). (Refer to page 5-378.)
The function of these terminals can be changed with the output terminal assignment (Pr. 190 to
Pr. 194). (Refer to page 5-378.)
The terminal FM can be used to output pulse trains as open collector output by setting Pr. 291.
Not required when calibrating the scale with the operation panel.
NOTES To prevent a malfunction due to noise, keep the signal cables 10 cm or more away from the power
cables. Also, separate the main circuit cables at the input side from the main circuit cables at the
output side.
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 for-
eign matter to enter the inverter.
Set the voltage/current input switch correctly. Incorrect setting may cause a fault, failure or mal-
function.
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Installation and wiring