Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 32)

Publication 1746-UM010B-EN-P - April 2001
3-6 Configuring the Module
Heat/Cool Minimum
On-times Words 6 and 8 for channel 1
These values determine the minimum cycle time after which loop
TPO bits will turn ON. They are used to allow contactors time to close
or pull in. If the contactor is energized for less than this value, the
contactor will not close, but the attempt will count as a cycle.
For example, suppose you set the TPO period for 10 seconds and the
minimum ON time to 1 second. Then if the module calculates a CV%
of 10% or less, the TPO bit for that zone will not turn ON.
Heat/Cool TPO Period Words 7 and 9 for Channel 1
When CV loop output is time–proportioned (TPO), use this value to
set the interval between successive turn–ONs. For less than a 100%
output level, the output goes OFF for the balance of the interval.
PV Rate and Associated
Alarm Word 10 and Alarm Bit I:e.4/05 for Channel 1
The PV Rate is a setpoint with an associated alarm that indicates when
the temperature is rising too rapidly. If the zone’s PV has risen more
than this setpoint in one second (in auto mode), the module sets the
PV rate alarm bit (I:e.4/05, loop 1). The module only reports this
alarm - no action is taken.
High/Low Temperature and
Deviation Alarms Words 11-14 for Channel 1
In the configuration block (M1 file) you select values for the following
temperature–level alarms:
•
low temperature alarm (word 11 for channel 1)
•
high temperature alarm (word 12 for channel 1)
•
low deviation alarm from the set point(word 13 for channel 1)
•
high deviation alarm from the set point(word 14 for channel 1)