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Sigma II User's Manual
mechanism to prevent noise interference.
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 XXin. (30cm). 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.
2.
For details on grounding and noise filters, refer to 5.8.2 Wiring for Noise Control.
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.
Chapter 5: Parameter Settings and Functions
5-103
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