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ADVANCED APPLICATION OPTIONS
MultiDrive Feature
The SubDrive Connect Plus has MultiDrive functionality via the mobile app. A multiple drive/pump configu-
ration 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 multiple pumps and drives has the advantage of increased
efficiency at both very low and very high flow rates, as compared to a single pump sized to accommodate
typical usage. A single pump may not be able to supply the complete flow range and is likely to be ineffi-
cient at the ends of the range.
In contrast, a series of pumps/drives that operate at a high efficiency at low flow rates can maximize effec-
tiveness across the full spectrum of demand. The Lead drive will turn on pump 1 first to supply minimal
usage. Then, as additional flow is needed, Lag pumps will become active in order of their designation.
The SubDrive Connect Plus system can support up to eight pumps and drives.
Methods of Operation
The SubDrive Connect Plus multi-pump system is designed to operate as a constant pressure system using
PID feedback control. It can also be used as a pressure boosting system with dual PID control. It is possible
to use a pressure setpoint potentiometer, but it must be wired to all drives.
NOTE: This system is NOT suitable for use with a tank application, water level control, constant flow systems
(irrigation), fixed frequency applications, or with a speed potentiometer.
VFD Role Definitions for MultiDrive Operation
Risk of bodily injury or property damage. A pressurized system can cause a
pump to deadhead.
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To prevent this, size the pump to be able to withstand additional head equivalent to the regulating
pressure of the system.
Master: The drive that controls starting of the overall system and activating each pump.
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The Master is always the VFD with the lowest ID number.
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If the Master loses communication to the system, the remaining VFD with the lowest ID takes over as
Master. For this reason, the best practice is to program all drives with the same parameters.
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The overall system becomes active when the Master is in Auto.
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The Master monitors its own PID sensor, along with the Lead drive frequency to determine when to
start or stop remaining drives.
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The Master can also function in any of the other roles.
Lead: The Lead VFD regulates the overall pressure of the system using its own PID to control speed.
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The Lead drive operates in PID mode with its own PID settings to control the speed. If the drive is set to
operate at a fixed frequency, or to use a speed control potentiometer, it can-not function as a Lead.
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The Lead becomes active when in Auto mode, with its own run command, and a run command from
the Master.
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Assignment of the Lead drive can be optionally assigned to other drives on a rotating basis.
IMPORTANT: Since the Lead can change, each drive needs its own feedback sensor; or, the system could
have a single sensor with analog splitters to feed each drive. Each drive needs to be set to the same set-
point. If a change in setpoint is needed, the setting needs to be updated on all the drives.
(mobile app only)
ADVANCED APPLICATION OPTIONS
MultiDrive Feature (mobile app only)
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