Marathon Computer AACC 2000

Marathon Monitors Inc.

AACC 2000 Carbon Nov. 1, 1997

Name Description

PidPid PID list

G.SPG.SP If Gain Scheduling has been enabled (see Chapter 4), this parameter sets

the PV below which ‘Pid.1’ is active and above which ‘Pid.2’ is active.

SEtSEt ‘Pid.1’ or ‘Pid.2’ selected

PbPb Proportional Band (SEt 1)

(in display units)

titi Integral Time in secs(SEt 1)

tdtd Derivative Time in secs (SEt 1)

rESrES Manual Reset (%) (SEt 1)

HcbHcb Cutback High (SEt 1)

LcbLcb Cutback Low (SEt 1)

rEL.CrEL.C Relative Cool Gain (SEt 1)

Pb2Pb2 Proportional Band (SEt 2)

ti2ti2 Integral Time in secs(SEt 2)

td2td2 Derivative Time in secs (SEt 2)

rES.2rES.2 Manual Reset (%) (SEt 2)

Hcb2Hcb2 Cutback High (SEt 2)

Lcb2Lcb2 Cutback Low (SEt 2)

rEL.2rEL.2 Relative Cool Gain (SEt 2)

The following three parameters are used for cascade control. If this facility is not

being used, then they can be ignored.

FF.PbFF.Pb SP, or PV, feedforward propband

FF.trFF.tr Feedforward trim %

FF.dvFF.dv PID feedforward limits ± %

mtrmtr Motor list - see Table 4-3

tm Valve travel time in seconds

In.t Valve inertia time in secs

bAc.t Valve backlash time in secs

mp.t Minimum ON time of output pulse

U.br Valve sensor break strategy