Sanyo CM1972 Service Manual - Page 45

Protective Functions

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7-2. Protective Functions NOTE The numerical values such as temperature, frequency, time and current in parentheses are an example of CM3172 and the values are different from the other models. 7-2-1. Current Control The operating current may rise as a result of causes including increasing 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 cooling capacity. • Operation at normal capacity is restored when the cause of the current rise is eliminated. Current Description of function Example of operation for cooling (20A) (17A) (16.6A) Target frequency Power Point C Point B Point A 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. Point C (peak cut trip) Point B (Hz reduction) Point A (Hz increase prohibit) (20A) COOL (20.0) (17.0) (16.6) 45

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7-2.
Protective Functions
The numerical values such as temperature, frequency, time and current in parentheses are an example
of CM3172 and the values are different from the other models.
NOTE
7-2-1.
Current Control
The operating current may rise as a result of causes including increasing 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)
Power breakers and fuses will not be tripped.
Operation can continue during this period with somewhat reduced cooling capacity.
Operation at normal capacity is restored when the cause of the current rise is eliminated.
Description of function
•
•
•
Example of operation for 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
COOL
(20.0)
(17.0)
Point C (peak cut trip)
Point B (Hz reduction)
Point A (Hz increase prohibit)
(16.6)
45