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Chapter 2 System Configuration and Power Specifications
2.2 Power Supply Capacity
2-12
ME0392-4C
2.2 Power Supply Capacity
Power capacity is divided into two parts, control power capacity and motor power capacity.
24V DC power supply is to be input from the control power supply connector and the motor
power supply connector on the gateway unit. The user must make sure that 0 V of the control
and motor power is used in common.
The motor power supply to the 200V AC actuator is to be input from the 200V power supply unit
(RCON-PS2-3).
The necessary power capacity is calculated from adding the "total control power capacity of the
unit in use" and the "total motor power capacity of the connected actuator". However, the 200V
driver unit is to be calculated from the “sum-up of the control current amperage of used units”
and separated from the motor power supply.
The current rating for 24V DC power must exceed the total current rating for motor power
capacity, and the peak current must exceed the total motor power capacity. However, when
multiple axes are connected, provided that not all of the actuators' operation timing is the same,
the resulting value is not a simple total, because the rated current/maximum current do not flow
simultaneously.
2.2 Power Supply Capacity
ME0392-4C
2-13
[In-Rush Current of IAI Power Supply Unit PSA-24]
Item Conditions Specifications
In-Rush Current
At Cold Start (25°C)
100V AC 17A (typ)
200V AC 34A (typ)
At Cold Start (40°C)
100V AC 27.4A (typ)
200V AC 54.8A (typ)
The pulse width that the in-rush current flows in is 5ms or less. Also, in parallel operation, the in-
rush current is added for number of units. Confirm the characteristics when select so the
breaker would not work at the in-rush current.
[For 200V System]
For selection of the circuit breaker, follow the instructions below.
• Three times higher current than the rated flows to the controller at acceleration / deceleration.
Select a breaker that would not trip when this much current flows. In case it trips, it is
necessary to select a breaker with rated current one rank higher. (Check with the operation
characteristic curves shown in a catalog provided by the manufacturer.)
•
Select a breaker that would not trip with the in-rush current. (Check with the operation
characteristic curves shown in a catalog provided by the manufacturer.)
•
Select the rated cutoff current that surely cuts off the current even when short-circuit current
flows.
Rated Cutoff Current > Short-Circuit Current = Primary Current Amperage / Power Voltage
Have enough margin to the rated current when you select a circuit breaker.
For Single-Phase 200V AC:
Rated Current of Circuit Breaker > Motor Current Amperage (VA) / AC Input Voltage × Margin (1.2 ~ 1.4)
For 3-Phase 200V AC:
Rated Current of Circuit Breaker > Motor Current Amperage (VA) / AC Input Voltage × Margin (1.2 ~ 1.4) / √3
*Selection of Leakage Breaker
• It is necessary to clarify the purpose such as fire protection and human protection when
selecting a leakage breaker.
•
The leakage current may vary depending on the wattage of motor, cable length and other
ambient environment. In case of leakage protection, measure the leakage current at the
position to install a leakage breaker.
•
Select a leakage breaker applicable for higher harmonics.