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APPLICATIONS
2.8.1 Wiring Precautions
2
Note
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5) Observe the following precautions to prevent malfunctions due to noise interference.
• Position the input reference device and noise filter as close to the Servopack as pos-
sible.
• Always install a surge absorber circuit in the relay, solenoid and magnetic 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 (12 in). 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 a) Since Servopack uses high-speed switching elements, signal lines may re-
ceive noise. To prevent this, always take the above actions.
b) For details of grounding and noise filters, refer to 2.8.2 Wiring for Noise Con-
trol.
6) Use a molded-case circuit breaker (MCCB) or fuse to protect the power supply line from
high voltage.
• The Servopack is directly connected to com-
mercial power supply without a transformer.
Always use an MCCB or fuse to protect the ser-
vo system from accidental high voltage.
• Select an appropriate MCCB or fuse according
to the Servopack capacity and the number of
Servopacks to be used as shown in the following
table.
MCCB or Fuse for Each Power Capacity
Servopack Type
SGDF-A1C
SGDF-A2C
SGDF-A3C
SGDF-B3C
SGDF-B5C
SGDF-B9C
1) Power capacity at rated load.
2) Operating characteristics (25°C): 2 seconds or more for 200%, 0.01 second or more for
700%.
3) A fast-operating fuse cannot be used because the Servopack power supply is a capaci-
tor input type. A fast-operating fuse may blow out when the power is turned ON.
— 2-68 —
Molded-case Circuit
Breaker (MCCB) for
Wiring
Power Capacity Per
Power Capacity Per MCCB
Servopack (W)
(see note 1)
28
42
60
22
24
30
or Fuse (A)
(see note 2)
5
5
5
5
5
5
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