How It Works; System Diagnostics - Franklin Electric SubDrive Duplex Manuel D'installation

SubDrive Duplex Alternator

How It Works

The Franklin Electric SubDrive Duplex Alternator is designed to be part of two
independent SubDrive systems. Below is an example of a typical
alternator system.
Pressure Sensor
Cables
Pressure Sensors
(see Quick Reference Guide on
pg. 8 for more detail on plumbing)
Alternating SubDrive Systems
The alternator controls which drive is running the system by determining which
pressure sensor each drive sees. The two pressure sensors in the system must
have at least a 3 psi differential. The drive that uses the high set sensor will be in
control of supplying water to the system. The other drive will be on the lower set
sensor and will act as a backup. In the event that the primary drive cannot keep
up with the water demand, the backup drive will automatically start and provide
additional water. After the primary drive has reached its defined amount of run
time, the alternator will interchange the pressure sensors, thus causing the two
drive units to switch roles.

System Diagnostics

In addition to alternating the two drive systems, the alternator monitors the
two systems to see if they are meeting the water demand as expected. If a
system is not meeting the water demand as expected, the alternator will lock
the remaining system in as the primary system, declare a flash code indicating
what kind of fault was found, close the alarm contacts, and not allow further
alternation until the fault is cleared.
4
Duplex Alternator
Pressure Tank
SubDrive Pressure
Sensor Connections
SubDrive 1
To Power Supply
To Power Supply
SubDrive 2
Motor Cables