Emerson XEV22D Dokumentacja Pobierz pdf (Strona 14)

8 • XEV22D I&O Manual 026-1206 Rev 0 09-FEB-2011

8 Parameters

NOTE: All pressure parameters are relatives or absolutes depending on the PrM parameter.

Code Description Function

REGULATION

Fty Kind of gas (R22, 134, 404, 407, 410, 507, CO2)

Type of gas used by plant. Fundamental parameter for correct function-

ing of all systems.

PEo Probe error opening percentage (0 to 100%)

If a temporary probe error occurs, valve opening percentage is PEo until

PEd time is elapsed. If PEo is different from 0, it ensures cooling also

with probe error, because even if the device cannot calculate superheat,

the valve can work at PEo percentage.

PEd Probe error delay before stopping

regulation

(0 to 239 sec – 240 = On = unlimited)

If the probe error duration is bigger than PEd, valve closes completely.

The Pf message is displayed. If PEd = On, valve opening is PEo until

probe error finishes.

tEU Type of stepper motor (uP- bP)

Selects the kind of valve.

uP = 5 to 6 wires unipolar valves

bP = 4 wires bipolar valves

CAUTION!

By changing this parameter, the valve has to be re-initial-

ized.

tEP Predefined valve selection (0 to 10)

If tEP = 0, the user has to configure all the parameters to use the valve.

If tEP

is different from 0, the controller performs a fast configuration of

the following parameters: LSt, Ust, Sr, CPP, and CHd. To select the

correct value, refer to Table 4-1.

If tEP

is different from 0, previous configuration of LSt, Ust, Sr, CPP,

and CHd are overwritten

LSt Minimum number of steps (0 to Ust)

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

should be closed. Read the manufacturer datasheet to set this parameter

correctly. The 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.

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.

Table 8-1 - List of Parameters

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 29 30

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