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| Franklin Application/Installation Data (AID)
... For The Professional Driller-Installer |
Vol. 21, No. 1 Jan/Feb 2003 |
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SubDrive
150 Joins Franklin's CP Water Family
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The CP WATER family of constant pressure controllers is
growing! The newest addition to the CP Water - SubDrive family
is the SubDrive 150
TWICE THE PERFORMANCE
Like the SubDrive 75, the SubDrive 150 controller is a variable-speed
system. It continuously monitors the system pressure and adjusts
the pump / motor speed to meet the water demand and maintain
a constant pressure. You may remember that the SubDrive 75
uses a 3/4 Hp pump coupled to a 1 1/2 Hp motor. In the case
of SubDrive 150, it works with a 1 1/2 Hp pump on a 3 Hp motor.
The unit’s system performance will be similar or better
than a conventional 3 Hp pump of the same flow rating (pump
series). And, like SubDrive 75, any brand of off-the-shelf
pump can be used.
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SubDrive 75 |
SubDrive 150 |
| Franklin motor |
1 1/2 Hp, 230V,
3P |
3 Hp, 230V,
3P |
| Pump (any manufacturer) |
3/4 Hp |
1 1/2 Hp |
| System Performance
(minimum) |
1 1/2 Pump curve |
3 Hp Pump curve |
| Tank
Size (depending on GPM) |
2
gallon or 4 gallon |
4
gallon or 8 gallon |
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SINGLE-PHASE INPUT
Convenient single-phase voltage is used to power the SubDrive Controller.
The voltage is then converted by the controller to three-phase power
to provide infinite speed control of the motor from 1800 rpm to
4800 rpm.
RAMP UP MEANS LOWER IN-RUSH CURRENT
In most cases, whenever there is a demand for water, the SubDrive
150 will be operating. However, if the demand for water is small,
the system may cycle on and off at its minimum speed of 1800 rpm.
When demand increases, the controller “ramps up” the motor
speed, gradually increasing the voltage which results in a cooler
motor and lower in-rush current when compared to conventional water
systems.
“CITY-LIKE” WATER IN COUNTRY SETTINGS
The CP WATER SubDrive 150 combines reliability and state-of-the-art
technology. It provides owners of higher demand wells with a premium
water system that supplies constant “city-like” water
pressure by continuously adjusting the pump speed to meet water
demand. It also eliminates pressure cycling during long-run applications
such as lawn sprinkling and geothermal heat pumps.
CONSTANT PRESSURE FITS THE NEED
You should consider offering a SubDrive-equipped water well system
when your customer is looking for constant pressure in the household,
irrigation system, or geothermal heat pumps.
- Keeps pressure constant even when there is
fluctuating demand throughout the home.
- Constant pressure is good for:
• Irrigation systems - constant spray pattern, larger
zones
• Geothermal heating systems - eliminates cycling
• Home appliances - washer fills up faster, dishwasher
works better
• Water treatment systems - back-flushing is more efficient
- SubDrive controller benefits:
• as easy to install as a 3-wire control box.
• works with a standard pump and motor
• saves space - utilizes a small pressure tank
• built-in diagnostics and protection
• soft-start is easy on the motor, pump, and piping
AIR-COOLED CONTROL
Like SubDrive 75, the SubDrive 150 is air-cooled and is therefore
not dependent on water flow between the wellhead and controller.
So, it is possible to install a hose bib between the pump and the
pressure tank for outside watering activities such as sprinkling
or irrigation.
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PRESSURE SENSOR vs. PRESSURE SWITCH
Conventional private water systems intermittently fill a pressure
tank as commanded by a standard pressure switch (e.g. 30 -
50 PSI). This results in "pressure cycling" between
the ranges of the pressure switch. In the case of the SubDrive
150, the pressure sensor continuously communicates the system
pressure to the controller. The SubDrive 150 Controller then
maintains a constant pressure at the pressure sensor up to
the maximum capability of the motor and pump. As a result,
the inherent pressure cycling of a conventional system is
eliminated.
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| Pressure
Sensor Provides Dependable Service |
| Rated
for 500 psi, the pressure sensor can be relied on
for millions of cycles. It carries less than 5 volts
so there is no arcing and much less deterioration
of the contact points than found in conventional
pressure switches. The contact range of motion is
very small (measured in millimeters) and there is
no snap action involved. The result is a very durable,
long lasting sensor. |
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SYSTEM COMPONENTS
An entire SubDrive 150 system has only four components: the pump
/ motor assembly, the SubDrive 150 Controller, the pressure sensor,
and the tank. The tank can be as small as 4 gallon, resulting in
significant space savings. In retrofit installations, the existing
tank can be used.
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Franklin's CP WATER SubDrive 150 is designed
to be part of a system that consists of only four components:
A- Standard 1-1/2HP Pump with 3HP, 3-phase Franklin
motor.
B- CP Water SubDrive 150 controller.
C- 4-gallon (volume) Pressure Tank
(an 8-gallon tank for pumps
rated 12 GPM or more).
D- Pressure Sensor (provided)
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