APPENDIX
App. - 6
(b) Selection example of MCCB and fuse
Use T class fuses or molded-case circuit breaker (UL489 Listed MCCB) as the following table.
The T class fuses and molded-case circuit breakers in the table are selected examples based
on rated I/O of the drivers. When you select a smaller capacity servo motor to connect it to the
driver, you can also use smaller capacity T class fuses or molded-case circuit breaker than
ones in the table.
Driver (100 V class) (Scheduled release product)
Molded-case circuit breaker (120 V AC)
LECSN
1
-T5/ LECSN
1
-T7/ LECSN
1
-T8
NV50-SVFU-15A (50 A frame 15 A)
Molded-case circuit breaker (240 V AC)
(Note 2)
LECSN2-T5/ LECSN2-T7/ LECSN2-T8/ LECSN2-T9 (S)
NF50-SVFU-5A (50 A frame 5 A)
“(S)” means 1-phase 200 V AC power input and “(T)” means 3-phase 200 V AC power input in the table.
(c) Power supply
This driver can be supplied from star-connected supply with grounded neutral point of overvoltage
category III (overvoltage category II for 1-phase drivers) set forth in IEC/EN 60664-1. For the
interface power supply, use an external 24 V DC power supply with reinforced insulation on I/O
terminals.
(d) Grounding
To prevent an electric shock, always connect the protective earth (PE) terminal (marked ) of the
driver to the protective earth (PE) of the cabinet. Do not connect two grounding cables to the
same protective earth (PE) terminal. Always connect cables to the terminals one-to-one.
This product can cause a DC current in the protective earthing conductor. To protect
direct/indirect contact using an earth-leakage current breaker (RCD), only an RCD of type B can
be used for the power supply side of the product.
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