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
µs. 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
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