Watlow PPC-2000 - Manual (Page 207)

PPC-2000 User’s Guide Chapter 5: LogicPro and Modbus Reference
Doc.# 30002-00 Rev 2.3 Watlow Anafaze 181
Heat/Cool Derivative
The derivative term controls the amount of influence the rate
of change of the error has on the output. A greater value yields
a greater derivative action. The derivative constant is in units
of seconds.
Spread
This is the offset between heat and cool modes when both heat
and cool outputs for a channel are used. The spread is also the
switching hysteresis for on/off channels. The spread is set in
the channel’s engineering units to a positive value less than the
sensor range.
Heat/Cool Manual Reset
Enter a value to add to the PID output calculation. When the
corresponding Integral is set to zero, the value substitutes for
the integral sum portion of the feedback calculation. In this
case, the output equals the manual reset value when the
process variable is at setpoint. When the integral value is set to
a value other than zero, the manual reset value is added to the
result of the PID calculation and, thereby, shifts the output
variable.
This parameter is set in tenths of a percent. The valid range is
0 to 1000 and corresponds to 0.0% to 100.0%: for example, a
setting of 500 corresponds to 50.0%.
Control Type
Select the function of the channel.
Table 5.19 Control Types
Value AnaWin3 Name Description
0 PID1
Heat and Cool outputs, only one
on at a time.
1 PID2
Heat and Cool outputs, both may
be on.
3 Reserved n/a
4 Retransmit
Retransmit one or two analog
inputs