YASKAWA SGMSS - Molded-Case Circuit Breaker (MCCB)

4 Specifications and Dimensional Drawings of Cables and Peripheral Devices
4.4.8 Molded-case Circuit Breaker (MCCB)
4-14
4.4.8 Molded-case Circuit Breaker (MCCB)
If selecting a molded-case circuit breaker, observe the following precautions.
Ground Fault Detector
• Select ground fault detectors for inverters.
• High-frequency current leaks from the servomotor armature because of switching operation inside the
SERVOPACK.
(1) Maximum Input Current
• The instantaneous maximum output of SERVOPACK is approximately 3 times of the rated output for
maximum for 3 seconds. Accordingly, select a molded-case circuit breaker whose breaking time is 5 sec-
onds or more at 300% of SERVOPACK rated current.
The general-purpose low-speed acting molded-case circuit breakers are applicable.
• The power supply capacity per SERVOPACK when using a servomotor is described in 2.5.2 Molded-case
Circuit Breaker and Fuse Capacity. Select a molded-case circuit breaker with the capacity larger than the
effective load current (when using more than multiple SERVOPACK) calculated from the total power
supply capacity.
• The consumption of other controllers must be considered when selecting a molded-case circuit breaker.
(2) Inrush Current
• Refer to 2.5.2 Molded-case Circuit Breaker and Fuse Capacity for SERVOPACK inrush current.
• The allowable inrush current for a low-speed acting molded-case circuit breaker is approximately 10 times
of the rated current for 0.02 seconds.
• When turning ON multiple SERVOPACK simultaneously, select a molded-case circuit breaker with the
allowable current for 20 ms larger than the total inrush current shown in 2.5.2 Molded-case Circuit
Breaker and Fuse Capacity.
IMPORTANT
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