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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. For 200-VAC systems, use a varistor voltage of 470 V.
The surge absorbers shown in the following table are recommended.
Maker
Model
Matsushita
ERZC10DK471 (W)
Electric
El
i
ERZC14DK471 (W)
Industrial
Industrial
ERZC20DK471 (W)
ERZC20EK471 (W)
Ishizuka
Z10L471
Electric
El
i
Z15L471
Z21L471
Z25M471S
Okaya
y
R A V-781 BWZ-2A
Electric
El
i
R A V-781 BXZ-2A
Industrial
Industrial
R-A-V-401-621BYR-2
Note 1. The "(W)" for the Matsushita Electric Industrial products indicates that they are UL- and CSA-
approved products.
Note 2. Refer to 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 de-
crease the current or change to a larger-capacity surge absorber.
Note 4. The energy resistance is the value at 2 ms. At 700 V or less, high-energy pulses may not be
avoidable. In that case, use an insulated transformer or reactor for surge absorption.
Noise Filters for Power Supply Input
Use a noise filter for external noise attenuation and for the reduction of radiation noise from the Posi-
tion Driver.
Select a noise filter with a rated current of at least double that of the Driver's input current.
The noise filters shown in the following table can be used for 40-dB attenuation of noise between
200 kHz and 30 MHz.
Maker
Tokin
Note 1. For attenuating noise in a low-frequency band of less than 200 kHz, use an insulated trans-
former and a noise filter.
Note 2. For attenuating noise in a high-frequency band of more than 30 MHz, use a ferrite core and a
high-frequency noise filter employing a through-type capacitor.
2-70
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Varistor
Max. limit
voltage
voltage
470 V
775 V
470 V
775 V
470 V
775 V
470 V
775 V
470 V
773 V
470 V
738 V
470 V
733 V
470 V
810 V
---
783 V
---
783 V
---
620 V
Model
LF-210N
LF-215N
LF-220N
LF-315K
LF-325K
Surge
Energy
immunity
resistance
1,250 A
45J
2,500 A
80J
4,000 A
150J
5,000 A
150J
1,000 A
15W s
1,250 A
20W s
3,000A
30W s
10,000 A
235J
1,000 A
---
1,000 A
---
1,000 A
---
Rated current
10 A
15 A
20 A
15 A
25 A
Chapter 2
Fuse
Type
capacity
3 to 5 A
Tester
3 to 10 A
5 to 15 A
---
Block
3 to 5 A
Tester
3 to 5 A
5 to 10 A
---
Block
---
Block
---
---
Remarks
For single phase
g
For three phase
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