Wiring Of The Main Circuit - Mitsubishi FR-E540-0.4K-EC Instruction Manual

2.2.2 Wiring of the Main Circuit

(1) Wiring instructions
1) It is recommended to use insulation-sleeved solderless terminals for power supply
and motor wiring.
2) Power must not be applied to the output terminals (U, V, W) of the inverter.
Otherwise the inverter will be damaged.
3) 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., be careful so that chips and
others do not enter the inverter.
4) Use thick cables 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. (A selection example for the wiring length of 20m is shown on page 19.)
5) For long distance wiring, the overcurrent protection may be activated improperly 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. If the wiring length exceeds the value, it is recommended to set "1" in Pr. 156
to make the fast-response current limit function invalid. (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
200V class
400V class
200V class
400V class
Overall wiring length (3.7K or more)
INSTALLATION AND WIRING
0.4K 0.75K
300m 500m
200m 200m
200m 300m
30m 100m
500m maximum
300m
300m
300m + 300m = 600m
17
1.5K 2.2K
500m 500m
300m 500m
500m 500m
200m 300m
3.7K or
more
500m
500m
500m
500m