Locked Rotor Compressor

Compressor is pulling excessive / locked rotor amps. Verify run capacitor and plug harness. Compressor is tight or seized. A960_O Compressor Locked Rotor - Lockout Occurs after 3 attempts to restart after T960_O Compressor Locked Rotor faults. Verify run capacitor, harness plug, Compressor is tight or seized. A961_O No Voltage At Compressor

http://pts.myrheem.com/docstore/webdocs/Public/ServicePublic/Trouble2a/pdfs/AC/RA17/EcoNet_Alarms_2_Stage_AC.pdf

Compressor Locked Rotor Diagnostic. Posted on April 23, 2014 by yorkcentraltechtalk. Each year, the compressor manufacturer’s receive ...

https://yorkcentraltechtalk.wordpress.com/2014/04/23/compressor-locked-rotor-diagnostic/

Standard 3 phase motors often have these locked rotor codes: less than 1 hp: Locked Rotor Code L, 9.0 - 9.99 kVA; 1 1/2 to 2 hp: Locked Rotor Code L or M, 9.0 - 11.19 kVA; 3 hp : Locked Rotor Code K, 8.0 - 8.99 kVA; 5 hp : Locked Rotor Code J, 7.1 - 7.99 kVA; 7.5 to 10 hp : Locked Rotor Code H, 6.3 - 7.09 kVA; more than 15 hp : Locked Rotor

https://www.engineeringtoolbox.com/locked-rotor-code-d_917.html

Subsequently, question is, what causes a locked rotor ? A compressor may draw locked current for several reasons. Simply confirming a high amp draw on the common winding is not enough. A single phase compressor has two sets of windings: Run & Start. Something as simple as a broken wire or weak capacitor can generate a lock rotor condition.

https://askinglot.com/what-is-a-locked-rotor-condition

LRA, locked rotor amp. is the rated amp draw of a motor on start ups and lasts for 2 to3 seconds and is checked by a amp meter. the LRA rating can be found on the data plate of the motor. FLA full load amp. or RLA running load amp. is the rated amp draw during normal operation. a high LRA or FLA will open a overload that is wired in series with

https://hvac-talk.com/vbb/threads/130990-locked-rotor

What is locked rotor current used for? Measuring the locked rotor current (in the stator or rotor ) can be used to find the equivalent circuit components of an induction motor. However, it is a point of stress for the rotor coils/bars due to the high current.At startup, the motor will begin with a slip of one and hence produce high currents in the rotor .

https://askingthelot.com/what-is-a-locked-rotor-condition/