Watlow Series 982 - Manual (Page 111)

minimize wear on the mechanical components. Experiment until the cycle
time is consistent with the quality of control you want. Ct will not appear
on units with a process output (Option “F”) or if Pb = 0.
5. Rate/Derivative Adjustment: Increase rA/dE to 1.00 minute. Then raise set
point by 20° to 30°F, or 11° to 17°C. Observe the system’s approach to set
point. If the load process value overshoots set point, increase rA/dE to 2.00
minutes.
Raise the set point by 20° to 30°F, or 11° to 17°C and watch the approach
to the new set point. If you increase rA/dE too much, approach to set point
is very sluggish. Repeat as necessary until the system rises to the new set
point without overshooting or approaching the set point too slowly.
6. Calibration Offset Adjustment: You may want your system to control to a
process value other than the value coming from the input sensor. If so,
measure the difference between that process value (perhaps at another
point in the system) and the process value showing in the upper display.
Then enter the CAL offset value you want. Calibration offset adds or sub-
tracts degrees from the value of the input signal.
Changing the Output 3 Jumper
If you have model number 98_ C-_ _ _ _- J _ _ _, Output 3 can be configured
as a Form A (NO and common contact) or Form B (NC and common contact)
output. To change the output jumper:
1. Remove the control from the case. Release the two tabs on one side of the
control, then release the two tabs on the opposite side. You may need to
rock the bezel back and forth several times to release the chassis.
WATLOW Series 982 User’s Manual
8.3 Tuning, Alarms and Error Codes, Chapter 8
Figure 8.3 -
Output 3 Jumper
Location.
Control Chassis - Top View
Tuning/Operation
Jumper NO NC
Position (normally open) (normally closed)
Event on contacts close contacts open
Event off contacts open contacts close