Yaskawa FSP Amplifier - Manual (Page 318)

FSP Amplifier User’s Manual Appendix B: Special Wiring
B-3
5. To prevent malfunction due to noise, take the following actions:
• Position the input reference device and noise filter as close to the
servo amplifier as possible.
• Always install a surge absorber circuit in the relay, solenoid, and
electromagnetic contactor coils.
• The distance between a power line (such as a power supply line or
motor cable) and a signal line must be at least 11.8 in (30 cm). Do
not put the power and signal lines in the same duct or bundle them
together.
• Do not share the power supply with an electric welder or electrical
discharge machine. When the servo amplifier is placed near a high-
frequency oscillator, install a noise filter on the input side of the
power supply line.
Note: 1. Since the servo amplifier uses high-speed switching elements, signal lines may receive noise.
To prevent this, always take the above precautions.
6. Use a UL listed molded-case circuit breaker (MCCB) or fuse in
accordance with the National Electrical Code (NEC) to protect the
power supply line from high voltage.
• This servo amplifier connects directly to a commercial power
supply without a transformer, so always use an MCCB or fuse to
protect the servo system from accidental high voltage.
• Select an appropriate MCCB or fuse according to the servo
amplifier capacity and the number of servo amplifiers to be used as
shown in the following table.