Watlow Series 922 - Manual (Page 79)

Appendix
79
WATLOW Series 922 User's Manual
Glossary, H - O Hunting: Oscillation or fluctuation of process temperature between set
point and process variable.
Hysterisis: In ON/OFF control, the temperature change necessary
to change the output from full ON to full OFF.
Input: Process variable information being supplied to the instrument.
Integral: Control action that automatically eliminates offset, or "droop",
between set point and actual process temperature. Also reset.
Isolation: Electrical separation of sensor from high voltage circuitry. Allows
for application of grounded or ungrounded sensing element.
JC: The Jump Count parameter represents the number of times that
the Series 922 will jump to a specified step.
JS: The Jump Step parameter of the Series 922 will jump to any step
within your current file. You cannot Jump Step to another step in
another file.
JUMPLOOP: One of six step types under the PROGRAM menu of the Series
922, that can be programmed as a step or a file. You can jump
from one step to another within a file.
LAT: Latches your alarm outputs when the Series 922 has an alarm
condition. Remains active until you manually clear any alarms.
LINK: One of six step types under the PROGRAM menu of the Series
922, that allows you to link one file to another.
LOCK: Allows for specific groups of parameters to be unaffected by the
Up/DOWN and ENTER keys, preventing these parameters from
being changed accidentally. 0 = No lock, full access of all
parameters. 1 = Prevents user from editing all parameters
except the SYSTEM parameter group, FILE and STEP. 2 =
Prevents user from editing all parameters except ER1, ER2,
ALRM in the SYSTEM menu, the LOCK parameter, the STEP
and FILE parameter in the PROGRAM menu.
MIN: The MIN parameter has three meanings depending upon which
parameter you are in.
PROGRAM menu - The number of minutes that equal total step
time to achieve the temperature of the Series 922.
Under the AUTOSTART step type in the PROGRAM menu, it
represents the minutes that the 922 will wait for on the time-of-
day clock before AUTOSTART takes place.
SETUP menu - The SYSTEM 24 hour time-of-day clock setting.
Offset: Adjustment to actual input temperature and to the temperature
values the Series 922 uses for display and control.
ON/OFF control: Control of temperature about a set point by turning the output full
ON below set point and full OFF above set point in heat mode.
Open loop: Control system with no sensory feedback. The 922 uses a
closed loop.
Operating band: Area around set point in the Series 922 where ACTUAL tempera-
ture is deemed safe, or "OK". The band is defined under
ACCESS (5), SPCLFUNC, under the SETUP menu by Alarm
Types (ALTYP1 and ALTYP2) and under ACCESS (0), CALIB,
by Alarm High and Low Limits (A1H, A1L and A2H, A2L).