Watlow Series 920 Microprocessor-Based Ramping Control - Manual (Page 45)

One of three main level operating menus. From the SETUP menu, you can setup or
change system-operating parameters such as real time, high/low range, alarm types,
alarm points, PID settings and communications. You must select each ACCESS
number to create the personality of your Series 920.
1 ACCESS (0) 1
ACCESS number (0) must be selected to enter the personality of your Series 920 into
the CALIB parameters.
CALIB 1
1
Tl 0 0 : 0 0 1
In the Series 920, when ACCESS (0) is entered under the SETUP menu, the CALIB
parameters appear. These parameters set up the Real Time clock, alarms, and the
calibration offset of the process variable.
Represents the current Real Time hours and minutes of the Series 920s System.
Midnight = 0 hours and 0 minutes. A Read Only parameter.
Represents the SYSTEM 24 hour time-ofday clock for hours. Midnight = 0 hours.
Range: 0 - 23 hours
Default: 0
The SYSTEM 24 hour time-of-day clock setting for minutes.
Range: 0 - 59 minutes Default: 0
1 CAL ( ) An offset of the process variable. This number is added to the value that the system
derives. The final result is used for the control point.
Range: -50 to 50°C/-90 to 9O°F
Default: 0
The Series 920 will display this parameter the high process alarm or high
deviation alarm for Alarm 1. Displayed only when AUX 1 = AL. See Page 43.
This parameter represents the low process alarm or low deviation alarm for Alarm 1 of
the Series 920. Displayed only when AUX1 = A L See Page 43.
Represents the high process alarm or high deviation alarm for Alarm 2 of the Series
920. Displayed only when AUX2 = AL. See Page 43.
The low process alarm or low deviation alarm for Alarm 2 of the Series 920. Displayed
only when AUX2 = AL. See Page 43.
From RETURN, you can go back to the SYSTEM prompt by pressing the ENTER key,
or return to ACCESS (0) menu by pressing the MODE key.
In the SETUP menu, ACCESS (1) must be selected to enter the PID parameters.
When ACCESS (1) is entered under the SETUP menu of the Series 920, the PID
parameters will appear. These parameters consist of Proportional, Integral (auto
reset), and Derivative (rate) actions.
A proportional temperature band expressed in degrees within which a temperature
controller proportioning function is active for heating. Expressed in degrees. This
parameter will not appear if OUT = CL.
Range: 0 to 900°F/0 to 500°C Default: 45°F/25°C
A reset (integral) heating control action that automatically eliminates offset, or “droop”,
between set point and actual process temperature in a proportional control. Expressed
by repeats per minute. This parameter isn’t displayed if OUT = CL, or
PB H is set to 0.
Range: 0.00 to 5.00 repeats/minute Default: 0.00
The rate (derivative) heating function of the Series 920. The rate is determined by how
fast the error being corrected is increasing. Expressed in minutes. This parameter will
not appear if OUT=CL, or PBH=0.
Range: 0.00 to 5.00 minutes Default: 0.00
How To Program the Series 920, Chapter 6 WATLOW Series 920 User’s Manual 45