Xylem BMAID R4 - Manual (Page 42)

PAGE 42
Residential Water Systems
CentriPro
Note: Always consult the generator
manufacturer whenever questions arise.
These sizing charts are recommendations based on
motor service factor loading for typical continuous
duty generators. If you need to call the generator
manufacturer, be prepared to tell them the motor KVA
code, the service factor amperage, locked rotor am-
perage, phase, hertz, motor type, etc. This information
can all be found in this manual.
Please note that the 2-wire chart is only for PSC
(permanent split capacitor) type, 2-wire motors and
should not be used for split-phase, 2-wire motors. If
using split-phase, 2-wire motors the generator should
be 50% larger than that listed for a 3-wire motor.
You must know which type generator you have before
using the charts as the required generator size varies
by type. Internally regulated generators are also called
self-excited. Externally regulated generators are the
most common. In addition to the Kw/KVA rating, the
generator frequency (Hertz, typically 60 HZ in USA) is
very important when operating pumping equipment
because frequency variations affect pump output in
direct relation to the pump Affinity Laws. Operating
under 60 hertz will reduce flow and head while op-
erating over 60 hertz will increase flow, head, HP and
amp draw and could overload the motor.
The generator should always be started before the
pump/motor is started and always stop the pump/
motor before shutting down the generator. Operat-
ing generators at higher elevations or using natural
gas a fuel can affect performance, consult the genera-
tor manufacturer for their recommendations in these
instances.
GENErator SIzING
GENErator rECommENDatIoNS
Externally regulated Internally regulated
motor hp kw kVa kw kVa
minimum Generator rating
pSC .5 2.5 3.1 1.75 2.2
type .75 3.5 4.4 2.5 3.1
2-wire 1 5 6.3 3.2 4
1Ø 1.5 6 7.5 4 5
.5 2 2.5 1.5 1.9
.75 3 3.8 2 2.5
1 4 5 2.5 3.2
1.5 5 6.3 3 3.8
2 7.5 9.4 4 5
3 10 12.5 5 6.3
5 15 18.8 7.5 9.4
7.5 20 25 10 12.5
3-wire
10 30 37.5 15 18.8
1Ø
15 40 50 20 25
and
20 60 75 25 31
3Ø
25 75 94 30 37.5
motors
30 100 125 40 50
40 100 125 50 62.5
50 150 188 60 75
60 175 220 75 94
75 250 313 100 125
100 300 375 150 188
125 375 469 175 219
150 450 563 200 250
175 525 656 250 313
200 600 750 275 344