Samsung RL28DBSW1/BWT, RL28DATS1/XEK, RL28DBSI1/XEK manual Compressor Motor, Overload Protector

7.OPERATING PRINCIPLE OF MAJOR COMPONENTS, AND INSPECTION METHOD

7-1.Compressor Motor

	Operating principle				Inspection method
	The compressor motor, mounted directly to the		1) Measure		the	resistance		of each winding of			the
	compressor and located inside a sealed steel		compressor.
	case, has two windings.		a. Disconnect the power cord.
	One is a start winding and the other a run winding.		b. Remove the relay from the compressor.
	The windings are connected together internally,		C. Measure the resistance of each winding.
	forming a common connection. A lead is connected		A. The highest resistance value is the measurement of
	to each of the	windings, and to the common
	connection. These three leads are then connected		the "start" and			"run"	terminals whose windings				are
	to glass-sealed	terminals that extend through the	connected in series.
	compressor case.		B. The lowest resistance value is the measurement								of
	The terminals are clustered in al trangle ( pyramid )
	pattern and, reading from left to right, are identified:		the "run" and "common" terminals.
	Start, Common and Run.		C. The mid-level resistance
			value is the measururement
			of the "start" and "common"
			terminals.
			B + C = A
			2) Measure each terminal and
			ground with the ohmmetor
			set to the highest range.
			If a winding is found to be
			either open or shorted to
			ground, the compressor
			has failed.
		Compressor Windings
7-2 Overload Protector
	Operating principle				Inspection method
	The overload protects the compressor motor by		1) Check for continuity with ohmmetor.
	responding to both the temperature and current.		- If the overlosd is tripped,						cheak continuity after
	The overload protector is basically made up of		waiting until it has				cooled,		in the room ambient
	a set of the contacts normally closed and the		before checking.
	bimetal element.		- Even though the continuity of the overload is
	The overload, mounted externally and in direct		observed it is difficult to confirm that the overload
			is operating within the specification limits.
	contact with the compressor case, is connected
			If there		is any doubt, replace it with a part with
	in series with both windings of the motor.
	If the motor fails to start for any reason, the heavy		identical specifications.
	locked rotor current will cause the bimetal element			: An	overload should			NEVER be by-passed
	to heat which then quickly flex, snapping the
	contacts open and interruption current flow through			in	the circuit ,		not	even		as a temporary
	the motor.			measure		until	the proper			replacement can
	Likewise, if the motor overheate to an unsefe leval,			be installed.
	the comination of current and temperature will cause
	the bimetal to snap the contacts open, On cooling,
	the bimetal flex back and snaps the contacts closed.
	The motor will continue to cycle on the overload so
	long as the oriqinal reason for tripping persists

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