27
In
stal
lat
ion
Wiring
Wiring
Wiring for power voltage, earthing and external signals.
Points to be observed
Observe the following points during wiring work.
•
Electrical work should be performed by a qualified electrician. Always observe local
electric codes.
•
Observe the rated voltage range, or the electrical circuit in the control unit may fail.
•
Do not perform wiring work while electric power is ON. Otherwise, an electrical shock or
a short circuit may result. Be sure to turn off the power before wiring work.
•
Be careful for electric power not to be turned on during work.
Necessary tools
• Adjustable wrench or spanner
• Phillips screw driver
• Precision screw driver
Power voltage/Earthing
Points to be checked
• Check that power voltage is turned off.
Connect power cable via crimp contacts.
Earth the pump.
NOTE
• Do not share a power source with a high power device which may generate a surge voltage. Otherwise an
electronic circuit may fail. The conductive noise caused by an inverter also affects the circuit.
• Energize the pump with a power voltage via a mechanical relay or switch. Do not fluctuate the voltage, or
CPU may malfunction. See page 28 for the precautions for ON-OFF control by a mechanical relay.
Apply power sharply
Do not apply gradually
• Use a circuit protector (250VAC, 3A Medium speed) as necessary.
• Do not use a motor thermal relay.
POWER
ON
OFF
TIME
POWER
ON
OFF
TIME
1
2
Summary of Contents for EHN-B11-NAE
Page 67: ...67 Specifications ...