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LINEAR COMPRESSOR
2. Start Up and Operation
Unlike the off/on operation of a conventional compressor, the start up of a linear compressor requires 1 1/2 to 2 minutes to
reach maximum cooling capacity. This reduces noise and vibration. The controlled stroke and speed of a linear compressor
also provide a variable cooling capacity.
Then following graph compares the start up operation of linear and conventional compressors.
Input
Power
3. Protection Logic
Protection logic is used to shut down the compressor to protect if from sudden changes in the operating environment. An
occasional triggering of the protection logic will have no effect on the cooling capacity of the refrigerator but frequent stops
will affect cooling ability and require a check of the compressor and the PCB.
3-1. High Current Protection
High Current triggering of the protection logic can be caused by compressor damage, over charged refrigerant, a faulty Main
PCB, or cycle clogging.
a. If the current into the compressor exceeds a set limit, the MICOM is programmed to shut the compressor off (a software
protection). The compressor can be restarted after 7 minutes.
b. There is also a hardware high current protection in which the MICOM forces the compressor On/Off relay to open. In
this case, the compressor can be restarted after 5 minutes.
3-2. High Voltage Protection
A sudden increase in voltage (>7V) during normal operation can cause damage to the compressor because of a sudden
increase in the piston stroke. Therefore, Protection Logic will shut the compressor off in this situations. The compressor can
be restarted after 2 minutes.
3-3. Freezer Fan (F-Fan) Protection
When the F-Fan does not run, pressure on the low pressure side of the compressor drops quickly. This can result in an
increased piston stroke which can damage the compressor.
a. Door open - When the F-Fan is shut down because the refrigerator door has been open for about 1minute, the
compressor operation is reduced. It will return of full cooling capacity within 2 minutes of closing the door.
b. F-Fan Lock - If the fan does not operate for any reason other than Door Open, compressor operation is reduced and
error code "Er-FF" will be displayed.
1.5~2 min
Starting Area
- 51 -
Linear
Compressor
Reciprocation
Compressor
Driving Area
Time
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