Emerson XEV22D Especificaciones descargar pdf (Pagina 19)

How to Assign a MODBUS Address Parameters • 13

Ust Maximum number of steps (LSt to 800*10)

Selects the maximum number of steps. At this number of steps, the valve

should be opened completely. Read the datasheet provided by the valve

manufacturer to set this parameter correctly. The maximum number of

steps should be set within the advised range of functioning.

CAUTION! When this parameter is changed, the valve must be re-ini-

tialized. The controller performs this procedure automatically and re-

starts its normal functioning when the programming mode ends.

Sr Step rate (10 to 600 step/sec)

Maximum speed to change a step without losing precision

(= losing steps). Set parameter under the maximum speed.

CPP Current per phase (Only bipolar

valves)

(0 to 100 * 10mA)

Maximum current per phase used to drive valve.

CHd Holding current per phase

(Only bipolar valves)

(0 to 100 * 10mA)

The current per phase when the valve is stopped for more than 4 minutes.

oPE Start opening percentage (0 to 100%)

Opening valve percentage when the start function is active and during

post defrost phase. This phase duration is SFd time.

SFd Start function duration (0.0 to 42.0 min: tens of seconds)

It sets start function duration and post-defrost duration. During this

phase, the alarms are neglected.

Sti Stop regulation interval (0.0 to 24.0 hours: tens of minutes)

After regulating continuously for Sti time, the valve closes for Std time

to prevent ice from forming.

Std Stop duration (0 to 60 min)

Defines the stop regulation time after Sti. During this stop, display shows

StP message.

MnF Maximum opening percentage

at normal functioning

(0 to 100%)

During regulation, it sets the maximum valve opening percentage.

FOP Forced opening percentage (0 to 100 - not used; nU)

If FOP = not used; nU, valve works with regulation algorithm. If FOP

is different from not used; nU, the valve stays at FOP opening percent-

age. This function could be useful during plant starting or during service

operations.

PI PARAMETERS (For use of trained staff only)

Pb Proportional band

(0.1 to 50.0 / 1 to 90°F)

PI proportional band. A value

bigger than 5°C is advised.

Code Description Function

Table 10-1 - List of Parameters

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 35 36

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Emerson XEV22D Especificaciones Pagina 19

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