Watlow Series 985 - Manual (Page 27)

Mode Key
Control Set Point
NOTE:
The Upper display
will always show the
process value after 1
minute without key
strokes.
= Prompt appears or not according to control configuration.
.
Operation Parameters
Set Point 2: Sets the operating set point for Output 2 when control mode is Ht/
Ht or CL/CL. SP2 only appears when Ot1 and 0t2 are the same, and functions
as an ON/OFF control.
Proportional Band: Set the proportional bandwidth for each Output, adjustable
from 0 ° to 999°F or 0 to 555°C for ranges displayed in whole degrees, and 0 to
99.9°F or 0 to 55.5°C for ranges displayed in 0.1°. If set at Pb = 0, the Series
9801985 functions as a simple ON/OFF control with a 3°F or 1.7°C switching
differential for ranges displayed in whole degrees, and 0.3°F or 0.17°C for
ranges displayed in 0.1°. The default is 25°F/13°C.
If the input type is 0-5VDC or 4-20mA, the range of Pb1 is 0-999, 0-99.9 or O-
9.99 (determined by the value of DEC). The switching differential is 0.03, 0.3 or
3 units. Pb2 default is 0. Pb2 only appears with Ht/CL or CL/Ht operation.
Reset: Enter Reset for Output 1 or 2, adjustable from 0.00 to 9.99 rpts/min. A
value of 2.00 rpts/min. corresponds to an integral time constant of 30 seconds.
Selecting 0.00 = no integral action. rE2 only appears with Ht/CL or CL/Ht
operation. rA X will not appear if Pb X = 0 respectively.
Rate: Adjust Rate function for Output 1 or 2, from 0.00 to 9.99 minutes maxi-
mum. Selecting 0.00 = no derivative action. rA2 will only appear with Ht/CL or
CL/Ht operation. rA X will not appear if Pb X = 0 respectively.
Cycle Time: Enter the Cycle Time for each Output, adjustable from 1 to 60
seconds. The default will be 5 seconds. Ct1 will not appear if Output 1 is 4-20.
CT2 only appears with Ht/CL or CL/Ht operation..
Figure 29 -
The Operation Menu.
Setup, Chapter 4 WATLOW Series 980/985 User’s Manual 27