Emerson XEV22D Spezifikationen PDF herunterladen (Seite 15)

How to Assign a MODBUS Address Parameters • 9

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 min-

utes.

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)

If FOP = not used, valve works with regulation algorithm. If FOP is dif-

ferent from not used, the valve stays at FOP opening percentage. This

function could be useful during plant starting or during service opera-

tions.

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.

rS Band offset

(-12.0 to 12.0°C / -21to21°F)

PI band offset. It moves the pro-

portional band of the PI. With rS

= 0, the band is between Set to Set

+ Pb.

InC Integration time (0 to 255 sec)

PI integration time

PROBE PARAMETERS

Code Description Function

Table 8-1 - List of Parameters

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 29 30

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