SVD-208-053
8
4. Principle of operation
4.1 Block-diagram
AC voltage input
AC/DC
Amplifier
Comparator
Drive circuit
Ry1
Setting
part
Reference
voltage
±12V
±5V
＋12V
AUX. SUPPLY
Comparator
Drive circuit
Ry2
Setting
part
Reference
voltage
4.2 Operating explanation
After than AC-voltage input is transforming into DC voltage, constant value is made to amplify and it considers
as the input of comparator.
And, the reference voltage obtained from the control power source is divided in a setting part's digital switch,
this is considered as the input of the comparator of another side, and voltage comparison is performed.
An output operates a relay through a drive circuit.
5. Maintenance
5.1 Maintenance
The quality of this product is secured enough. However, also in order to prevent an accident beforehand, please
check an operation value periodically.
< Caution >
(1) Please do not make a wiring change of the input and auxiliary supply in an energization.
(2) Please check a connection diagram, in case you check the voltage of input, output, and auxiliary supply.
5.2 Countermeasures against troubles
As our principle, we recall product in question and repair it. If judged as product failure, have a contact with
us or sales agent for repairing work (Also have a contact with us or sales agent for specification change).
Product failure which we are not responsible for (When responsibility in manufacturing process is not recognized,
when product is disassembled/remodeled, in case of false operation by customer, etc.) is beyond our warranty.
Head Office : 11-13 Hitotsuya 1-chome, Adachi-ku, Tokyo, 121-8639 Japan.
Phone：03-3885-2411 , Fax：03-3858-3966
Kyoto Office : 1-19 Ichinobe-Nishikawahara, Jyoyou-shi, Kyoto, 610-0114 Japan.
Phone：0774-55-1391 , Fax：0774-54-1353
DATE：March 3, 2008
