shiftedbits
Member
I have an application coming up that requires a metering pump to be controlled via a PowerFlex 525 VFD.
Commands to the VFD are to be sent via the Ethernet interface from a Logix CPU.
Metering Pump Characteristics
------------------------------------------
- 2000 l/hr max Flow
-No feedback from Pump (No built in pump controls. Basic pump with Motor and mechanical drive)
-PD Type metering pump (diaphragm actuator is driven by a worm gear)
Customer requirements: (operating modes)
-----------------------------------
Open loop pump control (without any external feedback). Customer does not want to add a flowmeter.
1. Ability to dose (dispense) a given volume (i.e. Command pump to dispense 200ml and stop)
2. Ability to Dispense at full flow rate until commanded to stop.
3. Switch between 1 and 2 above on the fly.
Question:
Can powerflex 525 be used? Or is the above is even possible without a feed back mechanism
How would I go about configuring the PowerFlex 525 VFD for above (open Loop) operation.
Read thru the PowerFlex manual and a bit confused as to how to get this VFD configured to work in open loop mode.
Any help would be greatly appreciated.
Thx.
Commands to the VFD are to be sent via the Ethernet interface from a Logix CPU.
Metering Pump Characteristics
------------------------------------------
- 2000 l/hr max Flow
-No feedback from Pump (No built in pump controls. Basic pump with Motor and mechanical drive)
-PD Type metering pump (diaphragm actuator is driven by a worm gear)
Customer requirements: (operating modes)
-----------------------------------
Open loop pump control (without any external feedback). Customer does not want to add a flowmeter.
1. Ability to dose (dispense) a given volume (i.e. Command pump to dispense 200ml and stop)
2. Ability to Dispense at full flow rate until commanded to stop.
3. Switch between 1 and 2 above on the fly.
Question:
Can powerflex 525 be used? Or is the above is even possible without a feed back mechanism
How would I go about configuring the PowerFlex 525 VFD for above (open Loop) operation.
Read thru the PowerFlex manual and a bit confused as to how to get this VFD configured to work in open loop mode.
Any help would be greatly appreciated.
Thx.