IWAKI PUMPS EJ-B, Инструкция по эксплуатации, Страница: 25 / 56

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Wiring
Precautions for ON-OFF control by a mechanical relay
This pump is equipped with CPU. Observe the following points when ON-
OFF control is performed:
•
Do not turn ON/OFF power voltage more than six times per hour.
• When using a mechanical relay for ON-OFF operation, its contact capac-
ity should be 5A or more. Contact point may fail if it is less than 5A.
• If a mechanical relay with the contact capacity of 5A is used, the maxi-
mum allowable ON/OFF operation is about 150,000 times. The contact
capacity should be 10A or more when making ON-OFF operation over
150,000 times or sharing a power source with a large capacity equip-
ment. Otherwise a contact point may fail by surge voltage.
• Use a solid state relay (SSR) as necessary (such as the OMRON G3F).
See manufacturer's catalogues for detail.