IAI America XSEL-QX - Manual (Page 33)

9
Part 1 Installation
(4) Auxiliary power devices
[1] Circuit breaker
Install a circuit breaker or earth leakage breaker in the AC power-supply line (primary side) of the
controller in order to prevent damage due to power switching and short current. One circuit breaker or
earth leakage breaker can be used to protect both the motor power supply and control power supply.
x While the actuator is accelerating or decelerating, the controller current increases to three times
the rated current. Select an appropriate circuit breaker that will not trip when this higher current
flows. If the circuit breaker you have selected trips, change it to one with the next higher level of
rated current.
x Select a circuit breaker that will not trip due to rush current. [Refer to the graph of operating
characteristics in the manufacturer’s catalog.]
x The rated cutoff current of the selected circuit breaker must be enough to cut off any short-circuit
current, should it flow, without fail.
Rated cutoff current > Short-circuit current = Power-supply capacity on primary side / Power-
supply voltage
x The rated current of the selected circuit breaker should have an ample allowance.
Rated current of circuit breaker > (Rated motor power-supply capacity [VA] + Control power-supply
capacity [VA]) / AC input voltage x Safety factor (rough guide: 1.2 to 1.4)
[2] Earth leakage breaker
Install an earth leakage breaker on the AC power-supply line side (primary side) of the controller to cut off
earth leakage current. One earth leakage breaker may be used to serve both the motor power and plant
power.
x You must select an appropriate earth leakage breaker that can meet your specific purpose, be it
fire protection, protection of human life, or the like. Also measure the earth leakage current at the
location where the earth leakage breaker is to be installed.
x The earth leakage current changes according to the capacity of the motor to be connected,
lengths of cables, and surrounding environment. So that proper earth leakage protection can be
provided, measure the earth leakage current at the location where the earth leakage breaker is to
be installed.
x Use an earth leakage breaker of harmonic type.
[3] Electromagnetic contactor
If your controller is of the global specification, an electromagnetic contactor must be installed in front of the
motor power input port on the controller so that the motor drive source can be cut off. Select a product that
meets your requirement for safety category. Refer to Chapter 6, “Safety Circuit,” for the configuration of
the safety circuit.