Watlow Series 920 Microprocessor-Based Ramping Control Manual de usuario descargar pdf (Pagina 37)

Event Outputs

Another feature of the Series

920

is its capability for two event outputs. An

“event output” is simply a pre-programmed ON/OFF event per program step.

The event may turn any number of peripheral devices ON or OFF to assist you in

controlling your process, system or environment.

For instance, in an environmental chamber, you might wish to circulate air at a

given time in

your program

for one or more steps. You might want to turn lights

ON or OFF, or signals, or lock out your humidifier, or you could activate a video

recorder.

EV1

and EV2 will not be visible

under

the SYSTEM menu until you SETUP

AUX1

and AUX2 as events (EV).

Enter the SETUP menu, and enter ACCESS (5). This is the

SPCLFUNK

(Spe-

cial Function) parameter. Press the MODE key until you reach the

AUX1

pa-

rameter and press ENTER. The default for

AUX1

and AUX2 is AL

(Alarms).

Change the value to EV (Events) if it hasn’t already been done.

If you return to the SYSTEM menu,

EV1

and EV2 will be visible,

and can be

turned ON or OFF from here.

EV1

and EV2 can also be viewed

under

the

SETPOINT

parameter in the PROGRAM menu.

If the events are programmed

for one step and left unprogrammed for the next

step, the events will maintain the last programmed status.

These event outputs are mechanical relays rated at 6 amps up to

240VAC

Guaranteed Soak

The Series 920 Guaranteed Soak (GS) feature insures that the process tempera-

ture tracks a programmed ramp. The Guaranteed Soak acts as a

deviation

alarm. The program clock halts if the ACTUAL temperature exceeds the Guaran-

teed Soak value. At this time the HOLD LED flashesand the clock starts once

the process variable is within the GS deviation value. Programmed in degrees or

process units, GS is in the SETUP menu under ACCESS (5). Entering a value of

(0)

disables the Guaranteed Soak function. Figure 28 is an example of the

Guaranteed Soak function.

Temperature

Guaranteed Soak

Programmed Ramp

Window Around Set

Point

Time

Figure

Guaranteed Soak

(GS) Example

NOTE:

If the program is put

in the HOLD mode

while holding for a

guaranteed soak

and restarted at

another step, the GS

has to be met for the

previous step,

before the program

can continue.

How To Program the Series 920, Chapter 6

WATLOW

Series 920 User’s Manual

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