ADVANCED APPLICATION OPTIONS
Multi-Drive Configurations
107
Multi-Drive Configurations
Multi-Pump Application
A multi-drive/pump configuration is ideal for a system that
needs constant pressure with a wide range of flow, such as an
apartment building or a manufacturing facility. The use of multi
-
ple pumps and drives has the advantage of increased efficiency
at both very low and very high flow rates, as compared to a sin
-
gle pump sized to accommodate typical usage. A single pump
may not be able to supply the complete flow range and is likely
to be inefficient at the ends of the range.
In contrast, a series of pumps/drives that operate at a high effi
-
ciency at low flow rates can maximize effectiveness across the
full spectrum of demand. The Lead pump will start first to supply
minimal usage. Then, as additional flow is needed, Lag pumps
will start in order of their sequential ID number.
Additional pumps/drives can be added as standby units to
ensure full operation in case of fault or maintenance of one of
the primary units. The X-Drive system can support up to eight pumps and drives.
Method of Operation
The communication between VFDs will provide Master/Follower control and Lead-Lag sequence switching
which will allow pumps to alternate. The pump system can be set with brown box VFDs, separately enclosed
VFDs, or multiple VFDs enclosed in one industrial enclosure. For complete redundancy, each VFD requires a
pressure transducer in order to operate in PID mode and to provide full Master/Follower control.
If not every VFD in the system has pressure transducer feedback, the system can be set to run those VFDs as
Followers only at preset, fixed Lag Speed (no PID control).
The multi-pump application operates as a constant pressure system using PID feedback control.
Each drive is assigned a sequential ID number, and an initial role. Roles can be alternated; however, to be
included in the alternation cycle, each drive requires its own transducer.
MULTI-PUMP PERFORMANCE
1 PUMP
2 PUMP
3 PUMP
4 PUMP
FLOW (GPM)
HEAD (PSI)
Risk of bodily injury or equipment damage. A pressurized system can cause a
pump to deadhead.
•
To prevent this, size the pump to be able to withstand additional head equivalent to the regulating
pressure of the system.
Summary of Contents for CERUS X-DRIVE CXD-003A-4V
Page 2: ......
Page 3: ...CERUS X DRIVE INSTALLATION AND OPERATION MANUAL Firmware Version 1 2 Franklin Electric Co Inc ...
Page 96: ...OPERATION Protection Features 96 ...
Page 112: ...ADVANCED APPLICATION OPTIONS Multi Drive Configurations 112 ...
Page 124: ...COMMUNICATIONS BACnet Communication 124 ...
Page 128: ...ACCESSORIES Optional Extension Cards 128 Frame D Frame E Frame F ...
Page 129: ...ACCESSORIES Optional Extension Cards 129 Frame G Frame H ...
Page 132: ...ACCESSORIES Optional Extension Cards 132 ...
Page 234: ...PARAMETER REFERENCE TABLES Parameter Descriptions Motor Menu 234 ...
Page 250: ...GLOSSARY 250 ...