Watlow Series 920 Microprocessor-Based Ramping Control Instrukcja Użytkownika Pobierz pdf (Strona 56)

The Operating Band

Now we need to set the alarm limits. In doing so, you’ll define an “operating

band” where you want system temperature (or your controlled variable) to be

“OK” and alarm-free.

By selecting an alarm type (ALTYP), and then the alarm limits

(AXL,

AXH),

you

define the Operating Band. The extreme limits of the Operating Band are

defined by the 920s high and low ranges, see the table below.

The following limits are enabled when

RAL

and

RAH

are at their maximum

default values.

RAL

RAH

are changed, the corresponding process

alarm

value will also change to the

RAL/RAH

value.

If the input type is 0-5VDC or

4-20mA,

the process alarm value will change to their default value.

RAL

RAH

are changed, the deviation alarm value will change to its default

value.

Table

11 -

Operating Band

Limits

and Ranges.

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Watlow Series 920 Microprocessor-Based Ramping Control Instrukcja Użytkownika Strona 56