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In
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Wiring
Precautions for ON-OFF control by a mechanical relay
The control unit is equipped with a CPU. To ensure the CPU to work properly, always
start/stop the pump by the STOP signal for ON-OFF control. Try not to turn on and off the
main power. Otherwise, observe the following points:
• Ensure the minimum OFF time of 10 minutes
.
• The contact capacity of a mechanical relay should be 5A or more. Or a contact point
may break.
•
If the contact capacity of a mechanical relay is 5A, the maximum allowable number of
times the power is turned ON/OFF is 150,000. The contact capacity should be 10A or
more when the actual number of times is over 150,000 or when sharing a power source
with a large capacity equipment which may cause a surge voltage and damage a con
-
tact point.
•
Use a solid state relay (SSR) as necessary (such as the OMRON G3F). See manufac
-
turer's catalogues for detail.
Signal wire connection
Points to be checked
•
Check that power voltage is turned off.
Use our optional connector cables below or purchase DIN 4- and 5-pin female connector cables when using
signal input and output.
Optional 5m DIN connector cables for:
The EXT input signal
The STOP input signal
The AUX input/Analog output signals
The Alarm output signal
NOTE
•
Do not lay on these signal cables in parallel with a power cable. Otherwise the electromagnetic induction
noise is generated and malfunction or failure may result.
•
The following products are the recommended SSRs (Solid State Relays) for signal input. Any other SSRs
might cause malfunction. See manufacturer's information for details on these SSRs.
–OMRON G3FD-102S or G3FD-102SN
–OMRON G3TA-IDZR02S or G3TA-IDZR02SM
•
When using a mechanical relay for signal input, its minimum application load should be 5mA or below.
•
Insert the DIN 4- or 5-pin female connector as far as it will go and then tighten the skirt to make a secure con
-
nection.
*Use either a no-voltage contact or an open collector for the EXT signal.
