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8
Pump Sizing
The SubDrive300 is confi gured at the factory for use with 3 Hp pumps that
are mounted to 5 Hp Franklin Electric three-phase motors. In general, the
SubDrive300 will enhance the performance of a 3 Hp pump to a similar
or better performance than a conventional 5 Hp pump of the same
fl owrating (pump series).
To select the proper 3 Hp
pump, fi rst choose a 5 Hp
curve that meets the
application’s head and fl ow
requirements. Use the 3 Hp
pump in the same pump
series (fl ow rating). The
SubDrive300 will adjust the
speed of this pump to
produce the performance
of the 5 Hp curve. An
example of this is
illustrated in the graph at right.
Drive Confi guration
The SubDrive300 can also be set up to run a 5 Hp pump if desired, but the
larger pump will still produce to the 5 Hp curve and may only be operated
with a 5 Hp motor. To operate a different pump size, a DIP switch must be
positioned to select the correct pump rating. Otherwise, the SubDrive300
may trigger erroneous faults.
To confi gure the SubDrive300
for a 5 Hp pump, locate the DIP
switch marked “SW1” at the
lower right corner of the main
circuit board. Use a small
screwdriver (provided)
to change the DIP switch
setting according to the chart
as shown.
▲ WARNING
!
Serious or fatal electrical shock may result from contact with internal
electrical components. DO NOT, under any circumstances, attempt
to modify DIP switch settings until power has been removed and 5
minutes have passed for internal voltages to discharge!
700
600
500
400
300
200
100
51530456075
Flow GPM
Typical SubDrive300 Performance
)Q(1.XJUI4VC%SJWF
$POWFOUJPOBM)Q(1.1VNQ
$POWFOUJPOBM)Q(1.1VNQ
SW1
O
N
Configuration Switch
1 Pump Size
OFF 3.0 Hp
ON 5.0 Hp
Total Head (ft)