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18
Main circuit terminals
1.2.9 Earthing (Grounding) precautions
z Leakage currents flow in the inverter (filter pack). To prevent an electric shock, the
inverter (filter pack) and motor must be earthed (grounded). Earthing (Grounding)
must conform to the requirements of national and local safety regulations and
electrical codes.
(NEC section 250, IEC 536 class 1 and other applicable standards)
z Use the dedicated earth (ground) terminal to earth (ground) the inverter (filter pack).
(Do not use the screw in the casing, chassis, etc.)
Use a tinned* crimping terminal to connect the earth (ground) cable. When
tightening the screw, be careful not to damage the threads.
*Plating should not include zinc.
z Use the thickest possible earth (ground) cable. Use the cable whose size is equal to
or greater than that indicated in the following table, and minimize the cable length.
The earthing (grounding) point should be as near as possible to the inverter.
For use as a product compliant with the Low Voltage Directive, use PVC cable
whose size is indicated within parentheses.
z As a noise reduction technique, use one wire of the four-core cable with the earth
(ground) terminal of the motor, and earth (ground) at one point from the filter pack
side via the inverter. (Refer to page 2.)
(For the type without filter pack, earth (ground) the motor with the inverter at one point
on the inverter side.)
Motor Capacity
Earth (Ground) Cable Size (Unit: mm
2
)
200V class 400V class
2.2kW or less 2 (2.5) 2 (2.5)
3.7kW 3.5 (4) 2 (4)
5.5kW 5.5 (6) 3.5 (4)
7.5kW 14 (16) 3.5 (4)
11kW 14 (16) 5.5 (6)
15kW 22 (25) 14 (16)
CAUTION
When the inverter is run in the low acoustic noise mode, more leakage currents
occur than in the non-low acoustic noise mode due to high-speed switching
operation. Always earth (ground) the inverter, motor and filter pack before use.
P1
Inverter
U
V
W
Motor
IM
Power
supply
R
S
T
P
R
S
T
R0
S0
T0
P1
P
Filter pack
Earthing
(Grounding)
GND