14
Fig. 3.4a Grounding of Multiple inverters.
Good Good Bad
3.4 Grounding
Connect positive earth ground using terminal E on the Main Circuit terminal (TM1).
CAUTION: Ground wire size should be in accordance with NEC regulations or at least 14 AWG minimum. The lead
length should be kept as short as possible.
NOTE: Ground resistance to building earth should be below 100 ohm. Provide extra ground collector shoe if unsure
of ground on crane itself.
NOTE: NEVER ground inverter along with welding machines, large current motors....etc.
NOTE: Where several inverter units are used together all of them should be directly grounded to a common point.
Please follow the grounding instructions shown in Fig. 3.4.
WARNING: Never ground or connect terminal N of inverter to neutral.
Table 3.3b CC-4XX Series
Inverter type CC-407 CC-415 CC-422 CC-437 CC-455 CC-475 CC-4110 CC-4150 CC-4220
MCCB / fuse rating 10A 15A 20A 30A 40A 50A 75A
MC (A/B IEC rated) 100A09ND3 100A12ND3 100A18ND3 100A30ND3 100A38ND3 100A45ND3
Wire Size *1
(minimum)
TM1 14 AWG 12 AWG 10 AWG 8 AWG 4 AWG
TM2/TB1 18 AWG
Screw *2
Terminal size
TM1 (torque) M4 (16 in.-lbs) M6 (22 in.-lbs.)
TM2 (torque) M3 (7 in. - lbs.)
TB1 (torque) Wire clamp type captive screw. (10 in. - lbs.)
NOTE: *1 Use copper conductors only, minimum size listed, size field wiring based on 75°C wire only.
*2 Use only U.L. listed field wiring lug kits or U.L. listed ring terminals.
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