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APPENDIX
App. - 5
(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 servo amplifiers. When you select a smaller capacity servo motor to connect it to the servo
amplifier, you can also use smaller capacity T class fuses or molded-case circuit breaker than ones
in the table. For selecting ones other than Class T fuses and molded-case circuit breakers below,
refer to section 11.7.
Servo amplifier (Note) Molded-case circuit breaker (240 V AC) Fuse (300 V)
MR-JE-10_/MR-JE-20_/MR-JE-40_/MR-JE-70_ (T) NF50-SWU-5A (50 A frame 5 A) 10 A
MR-JE-70_ (S)/MR-JE-100_ (T) NF50-SWU-10A (50 A frame 10 A) 15 A
MR-JE-200_ (T)/MR-JE-300_ NF50-SWU-15A (50 A frame 15 A) 30 A
MR-JE-100_ (S) NF50-SVFU-15A (50 A frame 15 A) 30 A
MR-JE-200_ (S) NF50-SVFU-20A (50 A frame 20 A) 40 A
Note. "(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 servo amplifier can be supplied from star-connected supply with grounded neutral point of
overvoltage category III set forth in IEC/EN 60664-1. However, when you use the neutral point for
single phase supply, a reinforced insulating transformer is required in the power input section. 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
servo amplifier 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.
If using a leakage circuit breaker, always ground the protective earth (PE) terminal of the servo
amplifier to prevent an electric shock. This product can cause a d.c. current in the protective earthing
conductor. Where a residual current-operated protective (RCD: earth-leakage current breaker)
device is used for protection in case of direct or indirect contact, only an RCD of Type B is allowed
on the supply side of this product.
PE
terminals
PE
terminals