Watlow PPC-2000 - Manual (Page 151)

PPC-2000 User’s Guide Chapter 3: Operating with AnaWin 3
Doc.# 30002-00 Rev 2.3 Watlow Anafaze 125
LD Offset
Designate an offset value that determines the low deviation
alarm limit relative to the current set point. The low deviation
alarm occurs when the process variable is lower than the
channel set point less this value. The alarm limit changes when
the set point changes. The default low deviation alarm offset is
0.
Range: same as the range of the input type selected. See Table
3.15 on page 130.
LD Type
Set the function of the low deviation alarm. See Process Alarms
on page 95 for a description of the settings.
Range: Alarm or Control
LD Enable
Set this field to enable or disable the low deviation alarm.
When it is Enabled, the low deviation alarm activates if the
process variable (PV) dips below set point by more than the LD
Offset. The PV must rise above the low deviation limit plus the
alarm deadband to be reset (cleared). When this parameter is
set to Disabled, the low deviation alarm does not occur.
Range: Enable or Disable
LD Output Dest
Choose a digital output to toggle when the low deviation alarm
occurs. This may be any available hardware output or Soft
Boolean register accessible by the logic program. The default
for this parameter is Not Assigned. Outputs that are already
assigned to control output destinations will be rejected. The
same output may not be used for multiple alarm output
destinations.
Range: Not Assigned, or any of the digital outputs on the DigI/O
spreadsheet, or any of the Soft Bool registers.
LP Limit
Set the low process alarm limit. An alarm occurs when the
process variable is less than this value. This value does not
change when the set point changes. The default low process
alarm set point is 0.
Range: same as the range of the input type selected. See Table
3.15 on page 130.
LP Type
Select the function of the low process alarm. See Process
Alarms on page 95 for a description of the settings.
Range: Alarm or Control