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Sigma II User's Manual
3.3 Main Circuit Wiring
This section shows typical examples of main circuit wiring for Sigma II Series servo products,
functions of main circuit terminals, and the power ON sequence.
Observe the following precautions when wiring.
• Do not bundle or run power and signal lines together in the same duct. Keep power and signal lines
separated by at least 11.81in (30cm)
Not doing so may cause fire or malfunction.
• Use twisted-pair wires or multi-core shielded-pair wires for signal and encoder (PG) feedback
lines.out of control or malfunction.
The maximum length is 118.11in. (3m) for reference input lines and is (787.40in. (20m) out of control or
malfunction.
• Do not touch the power terminals for 5 minutes after turning power OFF because high voltage may
still remain in the servo amplifier.
still remain in the servo amplifier.
• Avoid frequently turning power ON and OFF. Do not turn power ON or OFF more than once per
minute.
Since the servo amplifier has a capacitor in the power supply, a high charging current flows for 0.2 seconds
when power is turned ON. Frequently turning power ON and OFF causes main power devices like capaci-
tors and fuses to deteriorate, resulting in unexpected problems.
• Suitable for use on a circuit capable of delivering not more than 5000A
imum.
Must be used with UL listed fuses or circuit breakers, in accordance with the National Electrical Code.
CAUTION
!
3-7
Chapter 3: Wiring
(symmetrical), 240V max-
RMS
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