[Q&A Question 339] 2017.12.23
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This post was last edited by liuquan1100 on 2017-12-23 07:47. [Q&A Question 339] What are the reasons why a motor will not start on 2017.12.23? (1) The circuit is disconnected; (2) Poor contact or the switch is not fully open; (3) The starter is damaged or has poor contact; (4) The windings are damaged. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) For management purposes, if you need to view content from a few days ago, please go through the summary post below. 2017 Q&A Summary Thread (updates have begun) https://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) https://bbs.hcbbs.com/thread-1657794-1-1.html 2017 Daily Image Summary Thread https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1875160 2017 LNG Version Daily Question List https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1804162 2016 Q&A Summary Thread (updates completed) https://bbs.hcbbs.com/thread-1597792-1-1.html
1. Check whether the motor startup is equipped with interlocks; if so, verify whether the conditions for startup are met. 2. Investigate the cause electrically – there may also be a fault in the power distribution room. 3. Inspect the motor
Power supply not connected \ Fuse blown, open circuit in stator or rotor windings, stator winding grounded, inter-phase short circuit in stator windings, overload or transmission mechanism jammed, interlock not released, alarm not reset, incorrect or damaged wiring of control equipment, overcurrent relay set too low
Shaft seizure, motor failure, no power supply, freezing inside the pump
1. The motor itself is broken. 2. The motor is not powered. 3. Incorrect power supply.
(1) Check whether power is supplied. (2) The pump is overloaded or experiencing excessive current. (3) The pump is stuck; try turning it by hand before starting it. (4) Check if there are any interlocks that have not been reset. (5) If the motor is equipped with a space heater, start the space heater first
1. Excessive motor load leads to high starting current, triggering overload protection. 2. The motor bearings or other drive bearings are seized. 3. The signal is ready, but the power switch is not turned on.
One phase is missing in the power supply input. Phase loss caused by poor contact of the contactor contacts. The thermal relay has tripped and will not reset. The motor itself is broken. The normally closed contact of the stop button is faulty. The normally open contact of the start button is in poor condition. The interlocked normally closed contacts have poor contact. Control circuit, main circuit, loose wiring. The contactor coil is open-circuited. The main contacts of the contactor are in poor contact. The contactor armature gets stuck, etc.