What is called soft start of water pump?
Soft start has many methods, mainly used in high-power motor.Through soft starter, or frequency conversion start, or star triangle start to achieve.It means that it starts at a slower pace.
Soft start is a form of electronic control, mainly through the soft drive to achieve. Principle: the former contactor is directly started as contactor, first pull in, and the device is started by soft driving. Soft start device start smoothly, starting current is small, control system life is long. Soft start is now in widespread use. But the use of high-power equipment is less, the general current is less than 120A.
Close the outlet valve of the pump, open the inlet valve, and can ensure that the water pump "self filling" (the liquid level is higher than the pump inlet pipe under the condition of the water pump start procedure is: to start the motor, to the normal operation of the motor, slowly open the outlet valve, the current gradually increase. But in the unattended operation (valve), and automatically pump, and pipeline diameter and length (in the pipeline water quality will be great), such as the motor start fast, to quickly promote the quality of water (as the train will soon accelerate acceleration), will make the motor starting current is large, causing the motor to trip and the damage of mechanical and electrical. Soft start (soft starter added in the circuit) - that is, slow motor speed, can overcome the above situation.Stop the pump normal order is: close the outlet valve, then stop the motor, such as unmanned operation, the outlet valve is not closed, when the pump stops suddenly, the water inside the tubes (especially vertical pipe), water will quickly turn back, so when the check valve suddenly closed, the fast flowing water suddenly stop by the inertial impact that produces "water hammer" effect and damage of pipeline system, using the "soft stop" should, in the circuit is connected with the soft stop device.
