7
A magnetic contactor is required to make the AC power to SERVOPACK ON/OFF sequence externally. Be
sure to attach a spark killer to the excitation coil of the magnetic contactor.
If selecting a molded-case circuit breaker, observe the following precautions.
• Do not touch the regenerative units as they reach high temperatures. Use heat-resistant, non-
flammable wiring and make sure that the wiring does not touch the units. For connecting wire size when
connecting a unit, refer to P16.
• The regenerative unit has three error detection functions: regenerative resistor burnout, regenerative
transistor failure, and overvoltage detection. When these functions are tripped, the built-in alarm relay will
operate and the C1 and C2 output terminals of the regenerative unit will be opened.
• Construct a sequence so that the power supply (through L1 and L2) to the SERVOPACK will be always
shut OFF when the alarm relay operates. Two to three seconds are required to reset the alarm relay once
the alarm relay operates. The alarm state will return to normal when the main capacitor in the SERVOPACK
finishes discharging.
• The instantaneous maximum output of SERVOPACK is approximately 3 times the rated output. The output
can last up to 3 seconds. Accordingly, select a molded-case circuit breaker whose breaking time is 5
seconds or more at 300% of SERVOPACK rated current. The general-purpose low-speed acting molded-
case circuit breakers are applicable.
• The consumption of other controllers must be considered when selecting a molded-case circuit breaker.
• The power-supply capacity per SERVOPACK when using a servomotor is described in
n
SERVOPACKs
and Applicable Peripheral Devices
on page 4. If using several SERVOPACKs, select a molded-case circuit
breaker with a capacity larger than the effective load current, which is calculated from the total power
supply capacity.
• The allowable inrush current for a low-speed acting molded-case circuit breaker is approximately 10 times
the rated current for 0.02 seconds.
• If several SERVOPACKs are being used at the same time, select a molded-case circuit breaker with an
allowable current (20 ms) greater than the total inrush current of the SERVOPACK.
• Refer to
n
SERVOPACKs and Applicable Peripheral Devices
on page 4 for more information on the
SERVOPACK's inrush current.
• Install a noise filter on the power supply line for peripheral equipment as necessary.
• Use a noise filter to prevent noise interference. If the equipment is to be used near private houses or may
receive noise interference, install a noise filter on the input side of the power supply line. Because the SJDE
SERVOPACK is designed as an industrial device, it provides no mechanism to prevent noise interference.
• Install the input reference device and noise filter as close to the SERVOPACK as possible.
<Caution>
<Maximum Input Current >
< Inrush Current >
Selection of Devices
Molded-case Circuit Breaker (MCCB)
Noise Filter
Magnetic Contactor
• It is recommended to use a general-purpose circuit breaker of the rated current 200 mA or more, or a circuit
breaker for inverters (for high-frequency).
•
High-frequency current may leak through the armature of a servomotor when switching in the SERVOPACKs.
Earth Leakage Breaker
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