General Functionality
Si04-115
34
Main Function
1.13
Input Current Control
Outline
The frequency control will be carried out so that the input current will not exceed the rated value
in the zone which is divided by the input current detected with CT as the figure below shows.
"
I4, I3, I3-I
α
are included in the stop zone, step down, steady zone, respectively.
Processing
1. Frequency control in each zone
"
Step down zone (judged as the step down zone with the input current I IN
≥
I3)
"
The upper limit FNYD of the frequency in this control is defined as ‘operation frequency - 2
Hz‘.
"
After this, the output frequency is dealt with step down by 2 Hz every one second till it will
reach the steady zone.
"
Steady zone (judged as the step down zone with I3 - I
α
≤
I IN < I3 by step down operation)
"
Keeping the present frequency’s upper limit FNYD.
"
Return zone (judged as the return zone with I IN < I3 - I
α
) (I
α
= 1A)
"
Limit of frequency is cancelled.
"
Stop zone (judged as the stop zone with I IN
≥
I4)
"
Compressor is stopped and countermeasure for the malfunction is carried out.
2. Current step down : deciding I3
"
In cooling mode
"
At outdoor temperature > DOAIC
I3 = I3C - 0.5 × (outdoor temp. DOAIC)
∗
At POWER FULL, I3CPWF is used instead of
I3C.
"
At outdoor temperature
≤
DOAIC
I3 = I3C
∗
At POWER FULL, I3CPWF is used instead of I3C.
"
In heating mode
"
At outdoor temperature > DOAIW
I3 = I3W - 0.25 × (outdoor temp. - DOAIW)
∗
At POWER FULL, I3WPWF is used instead
of I3C.
" "
At outdoor temperature
≤
DOAIW
I3 = I3W
∗
At POWER FULL, I3WPWF is used instead of I3W.
C : Cooling PWF : Powerful W : Heating
DOAIC : Ambient temperature at cooling
DOAIW : Ambient temperature at heating
Input current detected with CT: I IN
Compressor stops.
I3 - I
α
I3
I4
Return zone
Steady zone
Step down zone
Stop zone
I4 = 10A
I
α
= 1A
(R1919)
(a constant)
J type 25
J type 35
I3C
6.50 A
8.00 A
I3CPWF
7.25 A
8.50 A
DOAIC
40°C
40°C
I3W
6.50 A
7.50 A
I3WPWF
6.50 A
7.50 A
DOAIW
12°C
12°C
