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3. Wiring
Electrical works or wiring must be carried out by a qualified person according to local laws or regulations.
• Use the electromagnetic switch which conforms to the motor specifications of voltage and capacity etc.
• When installing the pump out of doors, take a measure to prevent rain water from getting into the switch
when wiring.
• Install the electromagnetic or the push-button switch apart from the pump.
• The star-delta starter, inverter, or soft starter is recommended to start the motor of 5.5kW or more.
* See the instruction manual of the motor manufacturer for the motor detail.
4. Protection equipment
It is recommended to install the following monitoring devices in order to protect the pump.
1. Current sensor/ Power sensor
The sensors monitor the motor load and stop the pump on the detection
of load change, giving an alarm.
2. Pressure sensor
The sensor monitors the starting pressure and stops the pump on the
detection of pressure change, giving an alarm.
3. Flow sensor
The sensor monitors the discharge flow and stops the pump on the
detection of flow change, giving an alarm.
4. Level sensor
The sensor monitors the liquid level and stops the pump when it falls
below the specified level, giving an alarm.
It is recommended to install two or more monitoring devices. The more monitoring devices, the more possi-
bility of protecting the pump.
The DR series dry running protector (electric current sensing type) is also available as an option. Contact us
for detail.
Installation
