Appendix B - Pump Control From A Plc - Graco E-Flo DC Series Instructions Manual

Appendix B - Pump Control from a PLC

Appendix B B B - - - Pump
Appendix Appendix
This guide shows how to use the information in
Appendix A to control a pump remotely from a PLC.
The steps progress from basic pump control to more
advanced monitoring and alarm control features.
It is important that you first follow all directions in the
Setup Screens to configure your system properly.
Test that the pump operates correctly when controlled
from the Display. Make sure the display, fiber optics,
communication gateway, and PLC are connected
properly. Refer to Communication KIt manual. Use
Setup Screen 11, page 38
and set your modbus preferences.
Enable PLC PLC control: control: Set register 404200 to 1.
1. Enable Enable PLC control:
Run a a a pump: pump: Set register 404201. Enter 0 for
2. Run Run pump:
stopped, 1 to 4 for the desired profile.
3. View View pump View pump pump profile: profile: Read register 404201. This profile:
register updates automatically to reflect the
actual pump status. If the profile is changed from
the display, this register changes as well. If the
pump stops due to an alarm, this register will
read 0.
4. View View pump View pump status: pump status: Read register 404100 to see status:
the status of the pump. See Appendix A, Table
7, for a description of each bit.
• Example 1: Register 404100, bit 1, reads 1 if
the pump is currently moving.
• Example 2: Register 404100, bit 2 reads 1 if
the pump has an active alarm.
72
Pump Control Control from
Pump Control
to enable remote control
from a a a PLC PLC
from PLC
Monitor alarms alarms and
5. Monitor Monitor alarms
404112 to 404115. Each bit in these registers
corresponds to an alarm or deviation. See
Appendix A, Table 5.
• Example 1: Pressure falls below the minimum
setting entered on Setup Screen 2. It will show
on bit 4 of register 404113 if minimum pressure
is set to Alarm, and on bit 5 of register 404113
if minimum pressure is set to Deviation.
• Example 2: The system is set up for a
pressure transducer on Setup Screen 8, but no
transducer is detected. It will show on bit 1 of
register 404114.
Monitor pump pump cycle
6. Monitor Monitor pump
Read registers 404101 to 404105. Note that
pressure is available only if a pressure transducer
is connected to the display. Register 404104
shows the pressure on transducer 1. Register
404105 shows the pressure on transducer 2. See
Appendix A, Table 8 for units for these registers.
• Example 1: If register 404101 reads 75, the
pump speed is 7.5 cycles/minute.
• Example 2: If register 404103 reads 67, the
pump is operating at 67 percent pressure.
Reset active active alarms
7. Reset Reset active
condition that caused the alarm. Set register
404202, bit 0, to 1 to clear the alarm. The pump
will be in profile 0 due to the alarm. Set 404201
to the desired profile to run the pump again.
and deviations: deviations: Read register
and deviations:
cycle rate, rate, flow flow rate, rate, and and pressure:
cycle rate, flow rate, and
alarms and and deviations: deviations: Clear the
alarms and deviations:
pressure:
pressure:
3A3453H