MultiSmart Installation & Operation Manual
23.3 Setup an Analog Output for use with a VFD Drive
Navigate to:
Press Config and assign VFD Current Speed to an analog output. For more information, see Section 14.10.
23.4 Controlling a VFD Drive Using MODBUS
A VFD can be controlled using Modbus communications rather than an analog output.
To do this, the VFD Modbus master needs to be configured to read Input Register point 2 from the
MultiSmart. This Modbus point is assigned to the PumpControl.VFD.VFDCurrentSpeed tag. Refer to the
MultiSmart Modbus protocol manual for further information.
23.4.1 ABB VFD Drive Support
The VFD points list can be automatically configured for two drives manufactured by ABB – models ACS 550
and ACS 800.
To configure the MultiSmart:
• Create a Modbus Master and Slave configuration. (If an existing one is to be used, the points list
must be cleared first).
• Configure the protocol and communications channel for the Modbus Master/Slave configuration
just created.
• A Config Modbus button now appears in the Motor Protection screen. This allows selection of
the drive model and the configured Modbus Master/Slave. A points list is now created.
For a detailed procedure, a Knowledge Based Article is available (“Modbus Connection to ACS550 or
ACS800 VFD for Motor Protection, MultiSmart Firmware 2.2.0”) - contact MultiTrode.
NOTE:
Only selected points from Profile 3 of the ABB points list are supported.
23.5 Displaying VFD speed on Main Screen
See Section 26 Customizing the Display for information on how to display the VFD speed on the Main
Screen.
23.6 Calculating Efficiency using VFD
For pumps with VFD, currents and power for each pump can be obtained via Modbus communications.
Using this information, the MultiSmart is able to calculate pump power and efficiency and display it on the
LCD screen, as well as sending it to SCADA, even when the Motor Protection board is not present. To be
able to calculate the efficiency, energy monitoring, motor protection and flow modules must be enabled.
Refer to Section 17 for more information on energy monitoring and motor protection and refer to Section 20
for more information on flow.
Efficiency is calculated as Volume/Energy AND as Volume/Energy/Head.
MultiSmart_IO_Manual_R20 Page 203 of 260
To Next Page
Loading...
Need help?
General