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Chapter 3
3-22
System Design and Installation
●
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. The surge absorbers shown in the following
table are recommended.
Note 1. The (W) for the Matsushita models indicates that they are UL and CSA certified.
Note 2. Refer to the manufacturers’ documentation for operating details.
Note 3. The surge immunity is for a standard impulse current of 8/20
µ
s. If pulses are wide, either
decrease the current or change to a larger-capacity surge absorber.
Note 4. The energy resistance is the value for 2 ms. It may not be possible to retard high-energy
pulses at less than 700 V. In that case, absorb surges with an insulated transformer or reac-
tor.
●
Noise Filters for Power Supply Input
Use a noise filter to attenuate extraneous noise and to diminish noise radiation from the Servo Driver.
Select a noise filter with a load current of at least twice the rated current. The following table shows
noise filters that reduce by 40 dB noise between 200 kHz and 30 MHz.
Single-
phase
200
APA3H
30 W
0.82
90
1.025
NF30-SW 10A
200
APA5H
50 W
1.1
90
1.375
NF30-SW 10A
200
AP01H
100 W
2
90
2.5
NF30-SW 10A
200
AP02H
200 W
3.4
90
4.25
NF30-SW 10A
200
AP04H
400 W
5.5
90
6.875
NF30-SW 10A
200
AP08H
750 W
9.4
130
11.75
NF30-SW 15A
Maker
Model
Varistor
voltage
Max. limit
voltage
Surge
immunity
Energy
resistance
Type
Matsushita Electric
ERZC20EK471(W) 470 V
775 V
5,000 A
150 J
Block
ERZC25EK471(W) 470 V
775 V
10,000 A
225 J
ERZC32EK471(W) 470 V
775 V
20,000 A
405 J
Ishizuka Electronics
Co.
Z25M471S
470 V
775 V
10,000A
235 J
Block
Z33M471S
470 V
775 V
20,000 A
385 J
Type
Model
Rated current
Maker
Single-phase
GT-2050
5 A
Tokin
LF-210N
10 A
LF-215N
15 A
LF-220N
20 A
Smart
Servo
Driver
Power
supply
voltage
V
Servo
Driver
model
(R7D-)
Capacity Rated
current
A (rms)
Inrush
current
circuit
A (0-p)
125% of
rated
current
NFB model
Summary of Contents for SMARTSTEP A Series
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