Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual User Manual
Page 497
Rockwell Automation Publication 750-PM001J-EN-P - October 2014
497
Using DeviceLogix
Appendix C
Example logic requirements:
•
If Critical High Level or High Level sensor is ON, then start the drive.
–
If Critical High Level sensor is ON, then switch to higher rate (90Hz)
for the rest of the pumping cycle. Else run at the normal rate (60Hz)
–
Run until all three level sensors are OFF
–
Pump should run at least ‘x’ minutes at a minimum. If the Low Level
sensor fails, this prevents the High Level sensor from cycling the pump
On/Off too quickly.
•
Annunciate a Sensor Fault condition
–
The Low Level sensor should never be OFF when either the High Level
or Critical High Level sensors are ON
–
The High Level sensor should never be OFF when the Critical High
Level sensor is ON
–
The Critical High Level sensor should never be ON when either the
High Level or Low Level sensors are OFF
•
Annunciate a Critical High Level condition
–
The Critical High Level output should never be ON
•
Annunciate if pumping cycle time is longer than normal (‘y’ minutes)
–
Monitor the amount of time a pump cycle takes by timing how long the
drive is operating.
–
If greater than ‘y’ minutes, energize the Too Much Time Alarm output
•
Reset alarms / faults with a Reset pushbutton input
Parameter Configuration
The following parameters are configured for this example.
The following DeviceLogix parameters are configured for this example:
Port Parameter
No.
Parameter
Value
Description
0.520
Max Fwd Speed
90.00
0.545
Speed Ref A Sel
Port 0: Preset Speed 1
0.571
Preset Speed 1
60.00
Normal pumping rate (60Hz)
0.573
Preset Speed 3
90.00
High speed pumping rate (90Hz)
4.10
RO0 Select
Port 14: DLX DigOut Sts2.DLX
DOPSts0
Sensor Fault output
4.20
TO0 Select
Port 14: DLX DigOut Sts2.DLX
DOPSts1
Critical High Level Fault output
4.30
TO1 Select
Port 14: DLX DigOut Sts2.DLX
DOPSts2
Too Much Time Alarm output
14.33
DLX DIP 1
Port 4: Dig In Status.Input 1
Critical High Level Sensor input
14.34
DLX DIP 2
Port 4: Dig In Status.Input 2
High Level Sensor input
14.35
DLX DIP 3
Port 4: Dig In Status.Input 3
Low Level Sensor input
14.36
DLX DIP 4
Port 4: Dig In Status.Input 4
Alarm / Fault Reset pushbutton
input