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Wiring Of The Main Circuit - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

Transistorized inverter, high function & low acoustic noise.
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2.2.2 Wiring of the main circuit

( 1 ) Wiring instructions
1) Crimping terminals with insulation sleeves are recommended for use with the power and motor cables.
2) Cut the protective bushes of the wiring cover when running the cables. (22K or less)
3) Power must not be applied to the output terminals (U, V, W) of the inverter. Otherwise the inverter will be
4) After wiring, wire off-cuts must not be left in the inverter.
Wire off-cuts can cause an alarm, failure or malfunction. Always keep the inverter clean.
When drilling mounting holes in a control box etc., exercise care to prevent chips and other foreign matter
from entering the inverter.
5) Use cables of the recommended size for wiring to make the voltage drop 2% or less.
If the wiring distance is long between the inverter and motor, a main circuit cable voltage drop will cause
the motor torque to decrease especially at the output of a low frequency.
6) The overall wiring length should be 500m (1640.40feet) maximum.
Especially for long distance wiring, the overcurrent protection may be misactivated or the devices connected to the
output side may misoperate or become faulty under the influence of a charging current due to the stray capacitance
of the wiring. Therefore, the maximum overall wiring length should be as indicated in the following table. (When two
or more motors are connected to the inverter, the total wiring length should be within the indicated value.)
Inverter Capacity
Non-low acoustic noise mode
Low acoustic noise mode
Overall wiring length (1.5K or more)
7) Connect only the recommended optional brake resistor between the terminals P and PR 〈+ and PR〉.
These terminals must not be shorted.
8) Electromagnetic wave interference
The input/output (main circuit) of the inverter includes harmonic components, which may interfere with the
communication devices (such as AM radios) used near the inverter. In this case, install the FR-BIF optional radio
noise filter (for use in the input side only) or FR-BSF01 or FR-BLF line noise filter to minimize interference.
9) Do not install a power capacitor, surge suppressor or radio noise filter (FR-BIF option) in the output side of the
This will cause the inverter to trip or the capacitor and surge suppressor to be damaged. If any of the above devices
are installed, immediately remove them. (If the FR-BIF radio noise filter is connected, switching power off during
motor operation may result in E.UVT. In this case, connect the radio noise filter in the primary side of the
electromagnetic contactor.)
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300m (984.24 feet)
500m (1640.40 feet)
200m (656.16 feet)
300m (984.24 feet)
(1640.40 feet) maximum
(984.24 feet)
(984.24 feet)
300m (984.24 feet) + 300m (984.24 feet) = 600m (1968.48 feet)
1.5K or more
500m (1640.40 feet)
500m (1640.40 feet)


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