Watlow Series 982 User Manual download pdf (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

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Watlow Series 982 User Manual Page 111