Emerson XEV22D Spezifikationen PDF herunterladen (Seite 17)

How to Assign a MODBUS Address Parameters • 11

LOP Lowest operating pressure (PA4 to P20 bar/ psi)

If the suction pressure comes down to this value, a low pressure alarm is

signaled with Low Pressure alarm LED (related to PrM parameter).

PHY Pressure alarm hysteresis (0.1 to 5.0 bar/ 1 to 72 PSI)

Alarm hysteresis to disable alarm signaling.

dML delta MOP-LOP (0 to 100%)

When a MOP alarm occurs, the valve will close at the dML percentage

every one second until the MOP alarm is active. When LOP occurs, the

valve will open at the dML percentage every one second until LOP

alarm is active.

MSH Maximum superheat alarm (LSH to 32.0°C/ LSH to 176°F)

When the superheat exceeds this value, a high superheat alarm is sig-

naled after interval SHd.

LSH Lowest superheat alarm (0.0 to MSH°C/ 32 to MSH°F)

When the superheat goes down to this value, a low superheat alarm is

signaled after interval SHd.

SHy Superheat alarm hysteresis (0.0 to 25.5°C/ 1 to 77°F)

Hysteresis for superheat alarm deactivation.

SHd Superheat alarm activation delay (0 to 255 sec)

When a superheat alarm occurs, the time SHd has to pass before signal-

ing alarm.

FrC Fast-recovery constant (0 to 100 sec)

Increases the integral time when SH is below the setpoint. If FrC = 0,

fast-recovery function is disabled.

DISPLAY

Lod Local display Display: (SH, PEr, P1, P2)

SH = superheat; PEr = valve opening percentage; P1 = value of temper-

ature measured; P2 = pressure measured by P2 probe;

CF Temperature measurement units (°C to °F)

°C = Celsius degree; °F = Fahrenheit degree

CAUTION! By changing the measurement unit, the regulation parame-

ters have to be changed correctly.

PMU Pressure measurement units (bAr, PSI)

bAr = bar; PSI = psi

CAUTION! By changing the measurement unit, the regulation parame-

ters have to be changed correctly.

rES Resolution (only °C) (dE to in)

Whether a whole number or decimal point is used in temperature reading

PrM Pressure visualization mode (rEL to AbS)

rEL = relative pressure; AbS = absolute pressure

All pressure parameters depend on this parameter.

CLP Cooling percentage (Read only)

Displays the percentage of time during which the cooling call was active

in the time interval defined by parameter CLt.

tP1 Temperature probe value (Read only)

Shows the temperature probe value from P1.

PPr Pressure probe value (Read only)

Shows the pressure probe value. The value depends on PrM.

tP2 Temperature from P2 Shows the temperature obtained from conversion of pressure value.

Code Description Function

Table 8-1 - List of Parameters

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 29 30

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