Squirrel-cage asynchronous motor soft starter application - soft starter start,stop,features

Total pressure for water pump type load,motor starter,water,will be in a very short period of time to full speed in case of pipe bend,high-speed flow impact on the pipe wall,make a big impact,the formation of water hammer effect,can damage piping.If the water pump in front of the line is longer,when sudden stop water pump motor,high speed water flow will impact to the pump impeller,produce very big impact,can make the impeller deformation or damage.Shandong plant no.1,no.2 water pump room,undertake the task motor magnet the seepage discharge of underground powerhouse.Water pump room 1 6 motor rated power is 110 kw,the rated current of 202.2 A;2 water pump room 3 motor rated power is 75 kW,rated current 140 A.In the operation of the pump in the problems are: 1,overhaul of deep well water pump room of no.generator generator set 1,due to stop when the pump water hammer is too big,the original cast iron check valve blowout,now although change slow close check valve,alleviate the water hammer effect,but the water hammer will damage to the motor brake non- return plate.


2 water pump room 2 low pressure pump,water hammer effect makes the pump impeller damage.In April 2005,shandong factory for no.1,no.2 water pump room 9 pump control system is reformed,change from the previous relay control system to the programmable controller to control.Water pump motor for direct starting before modification,and electricalmotor1.blogspot.com now with ABB PST the soft starter.Through to the soft starter motor Settings of various parameters get better starting performance.Booster time: 3 s,starting voltage: 60%,current limiting multiples: 4 ie.Motor starting,the starting voltage 60% Ue,when four times starting current to rated current,output electrical motor voltage stability,until reduced to limit the following current,boosting process will continue,ensure the starting current is always less than 4 times the rated current,as shown in figure 2.Pump shut down,the water hammer effect caused by noise,vibration,often appear non-return valve fracture,short service life of pump pipeline rupture of fault,even the most difficult problem in the water supply system is the damage when the pump stop water hammer,soft starter excellent soft stop function is fundamentally solve this problem.Through to the soft starter Settings of various parameters to make the pump to obtain better braking performance.Decompression time: a t1 t2 = 3 s,end voltage: 60% Ue.

Low voltage circuit breaker DZ15 series and DZ20 series

1) DZ15 series:DZ15 series circuit breaker has obvious quick points in function and electrical

control circuits in mini electric motor operating machinery used in distribution,motor and lighting circuit overload protection and short circuit protection.2) DZ20 series:DZ20 series not only have the ability of fast closing and opening,also equipped with alarm contacts,available for distribution in the electrical control circuit.DZ series annotation type as follows:(1) DZ wholesalemotor.blogspot.com is code breaker,said plastic shell type circuit breaker;(2) design code;(3) the rated breaking capacity code (Y-plain,J-high type,type G-the highest,C-economical);(4) shell level rated current (A);(5) derived code (P-electric operation,L-leakage operation);The number of 6;All landowners trip code (0-no trip,1-thermal trip,2-electromagnetic trip,3-double trip).End attachment code (0-without attachment,2-shunt tripping device,3,undervoltage tripping device,4-auxiliary electric motors price contact shunt tripping device,5-shunt undervoltage tripping device,6-two groups of auxiliary contacts,7-under voltage trip auxiliary contact);Pet-name ruby attachment auxiliary code (0-no alarm gasoline generator contacts,8-there are alarm contacts).

IE2 and IE3 high efficiency three phase electric motor

Filler cap Electric hammer,electric pick etc tools have filler cap,how is the plastic material,can be special wrench or low speed permanent magnet generatorcirclip pliers,long nose pliers in the filler cap two eyes spin down,convenient and filling. Filler cap of fault slip wire or motor parts untight seal,oil spill. Slide wire is not serious,can be wrapped around some ribbons,hemp rope,cord,etc.;Serious,convenient use thicker plastic bag on the filler cap,then tap with a hammer,can also be electricalmotor1.blogspot.com bound once or more times on electrician with black tape and then turned on. Looked at the untight seal,O ring aging,damage,loss,a new O ring should be replaced.