Yaskawa Large Capacity Sigma II Series - Manual (Page 176)

4 Parameter Settings and Functions
4.8.1 Wiring Precautions
4-100
5. To prevent malfunction due to noise, take the following actions:
• Position the input reference device and noise filter as close to the SERVOPACK 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 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 SERVOPACK is placed near a high-frequency oscillator, install a noise filter on the input
side of the power supply line.
Note: 1. Since the SERVOPACK uses high-speed switching elements, sig-
nal lines may receive noise. To prevent this, always take the above
actions.
2. For details on grounding and noise filters, refer to 4.8.2 Wiring for
Noise Control.
6. Use a molded-case circuit breaker (QF) or fuse to protect the power supply line from high voltage.
• This SERVOPACK connects directly to a commercial power supply without a transformer, so
always use a QF or fuse to protect the servo system from accidental high voltage.
• Refer to 7.5.10 Molded-case Circuit Breaker (MCCB) to select an appropriate QF or fuse
according to the SERVOPACK capacity.