4 System Design
4-44
G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
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.
When selecting a no-fuse breaker, consider the maximum input current and the inrush current.
z 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 on page 4-21.)
• Add the current consumption of other controllers, and any other components when selecting.
z 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.
4-3-2 Selecting Connection Component
No-fuse Breaker (NFB)
Servo Drive model
Inrush current (Ao-p)
Main circuit power supply Control circuit power supply
R88D-KNA5L-ECT 7 14
R88D-KN01L-ECT 7 14
R88D-KN02L-ECT 7 14
R88D-KN04L-ECT 15 14
R88D-KN01H-ECT 14 28
R88D-KN02H-ECT 14 28
R88D-KN04H-ECT 14 28
R88D-KN08H-ECT 29 28
R88D-KN10H-ECT 29 28
R88D-KN15H-ECT 29 28
R88D-KN20H-ECT 29 14
R88D-KN30H-ECT 22 14
R88D-KN50H-ECT 22 14
R88D-KN75H-ECT 66 15
R88D-KN150H-ECT 66 15
R88D-KN06F-ECT 28 48
R88D-KN10F-ECT 28 48
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