Wiring Of The Main Circuit - Mitsubishi FR-E 500 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 (65.62 feet) is
shown on page 21.)
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
100V,
200V
Non-low
class
acoustic noise
mode 400V
class
100V,
200V
Low acoustic
class
noise mode
400V
class
Overall wiring length (3.7K or more)
0.1K 0.2K
200 200
(656.16) (656.16)
— —
30 100
(98.42) (328.08)
— —
500m (1640.40 feet)
(984.24 feet)
(984.24 feet)
300m (984.24 feet)+300m (984.24 feet)=600m (1968.48 feet)
INSTALLATION AND WIRING
0.4K 0.75K
300 500
(984.24 ) (1640.40)
200 200
(656.16) (656.16)
200 300
(656.16) (984.24)
30 100
(98.42) (328.08)
maximum
300m
300m
18
1.5K 2.2K
500 500
(1640.40) (1640.40) (1640.40)
300 500
(984.24) (1640.40) (1640.40)
500 500
(1640.40) (1640.40) (1640.40)
200 300
(656.16) (984.24) (1640.40)
(Unit: m (feet))
3.7K or
more
500
500
500
500