2-25
•
Use twisted-pair cables for the power supply cables whenever possible, or bind the cables.
Driver
Binding
R
T
or
Driver
R
T
•
Separate power supply cables and signal cables when wiring.
j
Selecting Components
This section describes the standards used to select components required to increase noise resistance.
Select these components based on their capacities, performances, and applicable ranges.
Recommended components have been listed; refer to the manufacturer of each component for details.
D
No-fuse Breakers (MCCB)
When selecting no-fuse breakers, take into consideration the maximum input current and the inrush
current. The momentary maximum output for a servo system is approximately three times that of the
rated output, and a maximum output of three seconds can be executed. Therefore, select no-fuse
breakers with an operating time of at least five seconds at 300% of the rated maximum output. General-
purpose and low-speed no-fuse breakers are generally suitable. Refer to the table in
2-2-3 Terminal
Block Wiring for the power supply input currents for each motor, and then add the current consumption
for the number of shafts, other controllers, etc., to make the selection.
The Servo Driver inrush current flows at a maximum of 50 A for 20 ms when 200 V is input. With low-
speed no-fuse breakers, a inrush current 7 to 8 times the rated current flows for 0.1 second. When mak-
ing the selection, take into consideration the entire inrush current for the system.
D
Surge Absorbers
Use surge absorbers to absorb surges from power supply input lines due to lightning, abnormal volt-
ages, etc. When selecting surge absorbers, take into account the varistor voltage, the amount of surge
immunity, and the amount of energy resistance. For 200-VAC systems, use a varistor voltage of 470 V.
The surge absorbers shown in the following table are recommended.
Maker
Model
Varistor
voltage
Max. limit
voltage
Surge
immunity
Energy
resistance
Fuse
capacity
Type
Matsushita
El
i
ERZV10D471(W)
470 V
775 V
1,250 A
45 J
3 to 5 A
Disk
Electric
Parts
ERZV14D471(W)
470 V
775 V
2,500 A
80 J
3 to 10 A
Parts
ERZV20D471(W)
470 V
775 V
4,000 A
150 J
5 to 15 A
ERZC20EK471(W)
470 V
775 V
5,000A
150 J
---
Block
Ishizuka
El
i
Z10L471
470 V
773 V
1,000A
15 W
s
3 to 5 A
Disk
Electronics
Co
Z15L471
470 V
738 V
1,250 A
20 W
s
3 to 5 A
Co.
Z21L471
470 V
733 V
3,000 A
30 W
s
5 to 10 A
Z25M471S
470 V
810 V
10,000 A
235 J
---
Block
Okaya
Electric Ind.
R
⋅
A
⋅
V
-781BWZ-2A
---
783 V
1,000 A
---
---
Block
R
⋅
A
⋅
V
-781BXZ-2A
---
783 V
1,000 A
---
---
R
⋅
A
⋅
V
-401
⋅
621BYR-2
---
620 V
1,000 A
---
---
System Design and Installation
Chapter 2
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