Argo R410A Manuel de service télécharger pdf (Page 50)

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.

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.

(20A)

HEAT

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(A)

Frequency (Hz)

Trip

Hz reduction

Hz increase

prohibit

Hz reduction

Hz increase prohibit

Hz reduction

Hz increase prohibit

(16)

(15.6)

(30)

Example of operation during cooling

Frequency

Frequency Current

Stops operation

Approx.3 minutes

Power Point C

Point B

Point A

(20A)

(17A)

(16.6A)

Target

frequency

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.)

•

As a result:

(1) Automatic frequency control

The operating frequency upper limits shown in the figure below are established for frequency reduction and

increase-prohibit.

(2) Current control

NOTE

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

COOL

(20.0) (20.0)

(17.0) (17.0)

(16.6)

Point C (peak cut trip)

Point B (Hz reduction)

Point A (Hz increase prohibit) (16.6)

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 101 102

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Argo R410A Manuel de service Page 50

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