Glossary, b - d – Watlow Series 922 User Manual

Page 77

Appendix

WATLOW Series 922 User's Manual

Glossary, B - D

BAUD:

Represents the baud rate (1200, 2400, 4800, 9600) that serial
communications will be running at. This parameter will not
appear under ACCESS (5) of the SPCLFUNC menu if your
Series 922 does not have communications.

CAL1, CAL2:

An offset of the process variable for Channel 1 or Channel 2.
This number is added to the value that the system derives. The
final result is used for the set point as well as a front panel
indication.

CALIB:

In the Series 922, when ACCESS (0) is entered under the
SETUP menu, the CALIB parameters appear. These parameters
setup the Real Time and the calibration offset of the process
variable.

C/F/U:

Accepts the sensor input and scales it to degrees Celsius,
Fahrenheit, or Units of measure.

Closed Loop:

Control system that has a sensing device for process variable
feedback.

CLR FILE:

Allows the operator to clear a file of the Series 922.

Cold Start:

A "clean", or completely cleared-of-user-program-information,
start-up condition. (Factory settings.)

COM:

Represents the selection of the protocol type for serial communi-
cations. This selects XON/XOFF protocol or ANSI X3.28
communication protocol under the ACCESS (5) SPCLFUNC
menu. This parameter will not appear if your Series 922 does not
have communications.

COM ID:

Represents the device identification number as required for the
ANSI X3.28 communications protocol for the Series 922.

CT1C/CT2C:

The Cooling Cycle Time, for Channel 1 or Channel 2, usually
expressed in seconds for a controller to complete one ON/OFF
cycle. The time between successive turn ons.

CT1H/CT2H:

The Heating Cycle Time, for Channel 1 or Channel 2 usually
expressed in seconds for a controller to complete one ON/OFF
cycle. Time between successive turn ons.

Cycle time:

The time necessary to complete a full ON-through-OFF period in
a time proportioning control system.

DAY:

Represents the number of days that the 922 will wait until
AUTOSTART takes place. Each time 00:00 is achieved, one day
has gone by.

DB1/DB2:

The Dead Band parameter for Channel 1 or Channel 2 represent-
ing the area where no heating or cooling takes place in a heat/
cool proportional control.

Dead band:

A temperature band between heating and cooling functions.

Derivative:

Anticipatory action that senses the rate of change of temperature,
and compensates to minimize overshoot and undershoot. Also
"Rate".

Deviation:

The difference between the value of the controlled variable and
the value at which it is being controlled.