Daikin J Series Service Manual download pdf (Page 105)

System control SiE18-201

94 Main Functions

3.22 PI Control

Outline Based on the ∆D signal, MAXα of the command frequency is monitored every 20 seconds, and

PI control is provided accordingly. (Coefficient of PI control varies for each S value.)

P Control At every sampling time TFSMP, the maximum value (MAXα) of α value is calculated, and if the

result differs from the previous value, the frequency is changed according to the amount of

fluctuation.

When the previous MAXα is MAXα1 and the newest MAXα is MAXα0, the upper-limit value of

MAXα is

MAX_ALFA_MX(9).

Operating frequency operating amount ∆F: ∆F = KP ° (MAXα0 - MAXα1)

P control is prohibited under the following conditions

(Equation (A))

MAX_ALFA_P1(3) ≤ MAXα0 ≤ MAX_ALFA_P2(5)

MAX_ALFA_P1(3) ≤ MAXα1 ≤ MAX_ALFA_P2(5)

P control is prohibited under left condition.

I Control When the ∆D signal does not change for the specified time, the frequency is increased or

decreased according to the MAXα value to set the MAXα value to the specified level.

When MAXα value is small → Frequency is decreased

When MAXα value is large → Frequency is increased

When MAXα at TFSMP(20) timer time-over is MAXα0:

If MAXα0 ≥ MAX_ALFA_12(6)

When frequency does not change for TFSMP ° M(120 sec)

Operating frequency operating amount ∆F is set to ∆F = KI ° (MAXα0 - MAX_ALFA_MK(3))

If MAXα0 ≤ MAX_ALFA_11(2)

Operating frequency is decreased at every TFSMP(20 sec)

Operating frequency operating amount ∆F is set to ∆F = -KI ° BI(1)

I control is prohibited when MAX_ALFA_11(2) < MAXα0 < MAX_ALFA_12(6)

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Daikin J Series Service Manual Page 105