Emerson XEV22D Specifikace stáhnout pdf (Strana 21)

How to Assign a MODBUS Address Parameters • 15

tdA Type of alarm signaled by relay (ALL, SH, PrE, di)

ALL = all alarm; SH = superheat alarm; PrE = pressure alarm; di = ac-

tivation only when digital input configured as rL is activated.

LPL Lower pressure limit for super-

heat regulation

(PA4 to P20 bar/ psi)

When the suction pressure comes down to LPL, the regulation is per-

formed with a LPL fixed value for pressure; when the pressure comes

back to LPL, the normal pressure value is used. (related to PrM param-

eter).

MOP Maximum operating pressure

threshold

(PA4 to P20 bar/ psi)

If the suction pressure exceeds the maximum operating pressure value,

the controller signals a condition with a High Pressure alarm LED (relat-

ed to PrM parameter).

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 de-

lay

(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

Code Description Function

Table 10-1 - List of Parameters

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 35 36

Komentáře k této Příručce

Žádné komentáře

Emerson XEV22D Specifikace Strana 21

Komentáře k této Příručce