2. Installation and Wiring
2-6
Note 5)
Refer to the appendix 1 for the power supply voltage and frequency, and prepare a power supply
suitable for the unit.
Note 6)
Power supply capacity
Make sure that capacity of the transformer used as the inverter's power supply is within the
following range. (For 4% impedance transformer)
Constant torque:
500kVA or less
Variable torque:
Capacity that is 10-times or less inverter capacity
If the above values are exceeded, install an AC Reactor on the inverter's input side or a DC
Reactor in the DC stage. (Refer to chapter 7-5).
Note 7)
Noise measures
The inverter will generate high harmonic electromagnetic noise, so using the following noise
measures is recommended. This must be followed for EMC (CE compliance)
a) Insert a noise filter on the input side of the inverter. Refer to Table 7-2 and select the noise
filter.
b) Keep the wiring length between the noise filter and inverter to 30cm or less for the N00K4 to
N22K0, X00K4 to X30K0, and 50cm or less for the N30K0 to N37K0, X37K0 to X45K0.
c) Use a shield cable for the inverter and motor wiring, and connect the screen to the inverter's
terminal and motor grounding terminal.
d) When both control circuit wiring and main circuit are wired in parallel, keep distance of 30cm
or more, or pass each of the wiring through metal conduits. If the control circuit wiring and
main circuit wiring intersect, make sure that they intersect at a right angle.
Note 8)
Inverter output
a) Do not insert a power factor improvement capacitor on the output side of the inverter.
b) When inserting a magnetic contactor on the output side of the inverter, prepare a sequence
control circuit so that the magnetic contactor will open and close after the inverter stops.
Note 9)
Grounding
Always wire the inverter’s ground terminal. The ground must be according to the regulations of
the Country where the inverter is being used .
Note 10)
Inverter output surge voltage (For 400V Series)
The surge voltage applied on the motor side increases depending the output cable length, If this
wiring between motor and drive exceeds in 30mts, connect a surge absorber exclusive for the
inverter output.
Note 11)
DCL
Always short circuit across L+1 and L+2 when not using the DCL. (Factory setting state)
When connecting the optional DCL, connect it to L+1 and L+2.
Twist the wiring to the DCL, and keep the wiring length to 5m or less.
Note 12)
DBR unit
When connecting the optional DBR unit, follow Fig. 2-4 (2) and connect the L+2 and L– for 011L,
011H and larger.
The DBR unit and inverter unit will both be damaged if the connection is incorrect.
Twist the wiring to the DBR unit, and keep the wiring length to 3m or less.
Refer to Section 7-4 for details.
Note 13)
DRB protection
When using the optional DBR unit, use the DBR unit's overload detection relay or insert a thermal
relay (76D) to protect the DBR resistor and inverter. Prepare a sequence control circuit to turn
OFF the magnetic contactor (MC) on the input side of the inverter or trip the wiring breaker
(MCCB) with trip coil using the contact of the DBR unit's overload detection relay or it's thermal
relay (76D).
Note 14)
Contactor’s coils
Install a surge absorber on the magnetic contactor or relay coils installed near the inverter.
