APC INROOM ACPSC3000 Instrukcje Operacyjne Pobierz pdf (Strona 41)

41InRoom Controller - Operating Instructions

➊

➋

➌

➍

➎

➏

A5

Control

The corresponding commands:

Times are entered in seconds.

The numbered callouts refer to the corres-

ponding passages in the descriptive text.

Display

Valves

G-valve

The pressure setpoint is entered in the 2nd

line and relates to the refrigerant condensa

-

tion pressure in the condenser.

➊

The pre-start serves to provide a sufﬁcient

ﬂow for the heat absorbing medium and to

pre-cool the heat absorbing medium. When

compressor operation is requested, the

G-valve opens and the compressor start is

delayed by the pre-start time. ➋

The pre-open value is the G-valve opening

which should be obtained during the pre-

start time.

➌

To avoid a constant discrepancy from the

set value there are three parameters, which

imitate the behavior of an integral control.

The control factor

➍ is the decisive value, by

which the extent of the control correction is

adjusted in the way of calculating the actua

-

ting variable after the lapse of an adjustable

control cycle ➎ (0-10 sec) according to the

following formula:

S

new

= S

old

- f • (set value - actual value)

S: actuating variable - in this case, valve

opening

f: control factor

Set value: condensation pressure

To avoid a drastical change you can adjust

a maximum control correction

➏ (0 - ±10%).

This control correction relates to the old

actuating variable in each cycle.

gvalve press 18.4

gvalve pretime 15

gvalve preopen 40

gvalve fact 2

gvalve concyc 5

gvalve maxc 5

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 105 106

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