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4-25
4-3 Wiring Conforming to EMC Directives
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
4
System Design
Selecting Connection Component
This section explains the criteria for selecting the connection components required to improve noise resistance.
Understand each component's characteristics, such as its capacity, performance, and applicable range when
selecting the connection components.
For more details, contact the manufacturers directly.
No-fuse Breaker (NFB)
When selecting a no-fuse breaker, consider the maximum input current and the inrush current.
Maximum Input Current
Œ
The driver's momentary maximum output is approx. 3 times the rated output, and can be output
for up to 3 seconds.
Therefore, select no-fuse breakers with an operation time of at least 5 seconds at 300% of the
rated current ratio. General and low-speed no-fuse breakers are generally suitable.
Œ
Select a no-fuse breaker with a rated current greater than the total effective load current of all the
motors (when multiple drivers are used). (The rated current of the power supply input for each
motor is provided in "Main Circuit and Motor Connections"(P.4-13).)
Œ
Add the current consumption of other controllers, and any other components when selecting.
Inrush Current
Œ
The following table lists the driver inrush currents.
Œ
With low-speed no-fuse breakers, an inrush current 10 times the rated current can flow for 0.02
second.
Œ
When multiple drivers are turned ON simultaneously, select a no-fuse breaker with a 20-ms
allowable current that is greater than the total inrush current, shown in the following table.
Driver model
Inrush current (Ao-p)
Main circuit
power supply
Control circuit
power supply
R88D-KTA5L 7 14
R88D-KT01L 7 14
R88D-KT02L 7 14
R88D-KT04L 15 14
R88D-KT01H 14 28
R88D-KT02H 14 28
R88D-KT04H 14 28
R88D-KT08H 29 28
R88D-KT10H 29 28
R88D-KT15H 29 28
R88D-KT20H 29 14
R88D-KT30H 22 14
R88D-KT50H 22 14