4-27
4-3 Wiring Conforming to EMC Directives
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
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
 The momentary maximum output of Servo Drive 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.
 Select a no-fuse breaker with a rated current greater than the total effective load current of all the
motors (when multiple Servo Drives are used). (The rated current of the power supply input for
each motor is provided in "Main Circuit and Motor Connections"(P.4-12).)
 Add the current consumption of other controllers, and any other components when selecting.
Inrush Current
 The following table lists the Servo Drive inrush currents.
 With low-speed no-fuse breakers, an inrush current 10 times the rated current can flow for 0.02
second.
 When the power of multiple Servo Drives 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.
Servo Drive model
Inrush current (Ao-p)
Main circuit power
supply
Control circuit pow-
er supply
R88D-KNA5L-ECT-R 7 14
R88D-KN01L-ECT-R 7 14
R88D-KN02L-ECT-R 7 14
R88D-KN04L-ECT-R 15 14
R88D-KN01H-ECT-R 14 28
R88D-KN02H-ECT-R 14 28
R88D-KN04H-ECT-R 14 28
R88D-KN08H-ECT-R 29 28
R88D-KN10H-ECT-R 29 28
R88D-KN15H-ECT-R 29 28
R88D-KN20H-ECT-R 29 14
R88D-KN30H-ECT-R 22 14
R88D-KN50H-ECT-R 22 14
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