Sanyo SAP-CMRV1926EH Current Control, Description of function, 1Automatic frequency control

7-2-2. Current Control

The operating current may rise as a result of causes including increasing heating or cooling loads or decreases in power voltage. In these cases, the operating frequency is automatically reduced, or operation is stopped, in order to control the operating current so that it is (20 A) or less.

As a result:

•Power breakers and fuses will not be tripped.

•Operation can continue during this period with somewhat reduced heating or cooling capacity.

•Operation at normal capacity is restored when the cause of the current rise is eliminated.

Description of function
	Example of operation for heating
Current	(20A)		Power Point C
	(16.6A)		Point A
	(17A)		Point B
	Target
frequency
Frequency		Frequency	Stops operation
			Approx.3 minutes

•Operates at the target frequency at Point A and below.

•Stops increases to the frequency between Points A and B.

•Reduces the frequency by 1 Hz per 0.5 seconds when Point B is exceeded.

•Stops operation, and restarts it appoximately 3 minutes later, if Point C is exceeded. (May operate when sudden voltage fluctuations occur. Indicates trouble.)

(1)Automatic frequency control

The operating frequency is reduced automatically, or operation is stopped, in order to control the operating current so that it is at or below the values shown in the table below.

	HEAT	(20A)
		COOL
Point C (peak cut trip)	(20.0)	(20.0)
Point B (Hz reduction)	(17.0)	(17.0)
Point A (Hz increase prohibit)	(16.6)	(16.6)

NOTE During defrost operation, the COOL current setting value is used.

(2) Current control

The operating frequency upper limits shown in the figure below are established for frequency reduction and increase-prohibit.

Current(A)	Example of operation during cooling
Trip		Hz reduction
Hz reduction
		Hz increase prohibit
Hz increase
prohibit
(16)		Hz reduction
		Hz increase prohibit
(15.6)
			Frequency (Hz)
0
	(30)

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