IAI America XSEL-S - Manual (Page 61)

Chapter 1 Specifications Check
1.2.4 Selection of the Circuit Breaker 1.2.5 Selection of the Leakage Breaker
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1.2.4 Selection of the Circuit Breaker
For the selection of the circuit breaker, perform it according to the following items.
� 3 times of the rated current flows to the controller during the acceleration/deceleration.
Select one that does not trip when the above current passes. When it trips, select the
breaker with a rated current one rank above. (Refer to the Operation Characteristic Curve
described in the catalogue of each manufacturer.)
� Select the breaker that does not trip with the rush current. (Refer to the Operation
Characteristic Curve described in the catalogue of each manufacturer.)
� For the rated breaking current, select the current value which can break the current even
when a short circuit occurs.
Rated Breaking Current > Short-circuit Current = Primary Power Supply Capacity/Power
Voltage
� Consider margin for the rated current on the circuit breaker.
Rated Current of Circuit Breaker >
Rated Voltage Amperage [VA] / AC Input Voltage × Margin (1.2 to 1.4 for reference)�
1.2.5 Selection of the Leakage Breaker
� Regarding the leakage breaker, it is necessary to have a clear purpose for selection such
as a fire protection or protection of human body.
� Leak current varies depending on the capacity of connected motor, cable length and the
surrounding environment. Measure the leak current at the point where a ground fault
circuit interrupter is to be installed when leakage protection is conducted.
� Use the harmonic type for a leakage breaker.