APC INROOM ACPSC3000 Instruções de Operação descarregar pdf (Página 70)

InRoom Controller - Operating Instructions70

➊

➋

➌

➍

➎

➏

R3

5 min.

S

ﬁx

dS

S

var

➊

T/°C

➋

R4

Service

The corresponding commands:

Display Gen. settings

Control/Parameters (Part 2)

The controller has the option of starting a

stand-by unit after an adjustable positive

temperature difference to the air tempera-

ture setpoint is achieved. This difference

can be adjusted by the parameter "Load

-

start"

➏ . The adjustment 0.0K disables

this function.

The sequencing function is not inﬂuenced

by starting a standby-unit.

The outside temperature

➊ for the com-

mutation from summer to winter operation

is decisive for the drycooler and com-

pressor control. With this hysteresis

➋

the winter operation changes to summer

operation.

The winter operation is also switched over

to summer operation if an outside temp.

sensor breakdown is detected. An alarm

"Outside temperature sensor defect" is

not displayed.

The winter start delay

➌ inhibits the low

pressure monitoring on alarm conditions

for an adjustable time in 0-255 seconds,

which is relevant for the compressor

operation.

You can determine an integral factor

➍

for the air temperature control to avoid a

control discrepancy which is characteristic

for P-controllers. In this case a variable

setpoint S

var, which is recalculated every

5 minutes is decisive for the control. This

variable setpoint is calculated by adding

the setpoint alteration dS to the previous

setpoint.

The values for the integral factor can be

varied between 0 an 80%. A low value

should be used to start with in order to

prevent the control system from oscillating.

10% are recommended and can stepwise

be increased to ﬁnd out the limit of safe

control.

For details of the cooling priority ➎ see

next page.

actual value

time

Svar

n+1

= Svar

n

+ dS with

dS = (Sﬁx - actual value ) x integral factor

sﬁx represents the ﬁxed setpoint which

is adjusted in the menu Control/Tem-

perature.

Summer

Winter

sumwin start 16.0

sumwin hys 2

winterdelay 180

integral 10

coolingprio 1

load 2.5

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 105 106

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