Generator Sizing For Subdrive Solar; Generator Selection Information - Franklin Electric SubDrive Solar Manuel D'installation

Generator Sizing for SubDrive Solar

Table 3 lists minimum generator sizes based on typical 80 °C rise continuous duty generators,
for Franklin's three-wire, single- or three-phase motors. This is a general chart. The generator
manufacturer should be consulted whenever possible, especially on larger sizes.
Follow generator manufacturer's recommendations for de-rating at higher elevations or using
natural gas.
MOTOR RATING
HP
0.75
1.5
3

Generator Selection Information

Not all AC generators will perform sufficiently with the SubDrive Solar product. Always consult
the generator manufacturer for application-specific information.
In a SubDrive Solar controller, AC input current flows directly through the input rectifier into
a storage capacitor, with no active power-factor-correction (PFC) circuitry. Because of variation
of generator performance when connected to an input circuit like this, it is recommended that
a suggested minimum kVA rating be obtained from the generator supplier for this type of
application (input rectifier to capacitor, no PFC).
The AC input of a SubDrive Solar controller draws current only near the peaks of the sine-
wave generator voltage. This pattern of current peaks may distort an input sine-wave voltage,
limiting the generator's ability to maintain the voltage level required by the drive. This
behavior is typical for equipment without dedicated power-factor-correction circuits.
A generator's ability to provide low-distortion voltage during such operation is limited
by a generator parameter called "sub-transient output reactance". The lower the
sub-transient output reactance, the better the generator can maintain a low-distortion
sine-wave output voltage.
Generators with the following ratings are expected to be capable of providing adequate
voltage to SUBDRIVE Solar drives at rated power of the drives.
For SubDrive Solar Model 5870300553: 3.1 kVA, less than 25% sub-transient reactance
For SubDrive Solar Model 5870301113: 5.5 kVA, less than 25% sub-transient reactance
For SubDrive Solar Model 5870301223: 9 kVA, less than 20% sub-transient reactance
The above information is a guideline for selecting a generator based on best known practice.
Not all AC generators will perform satisfactorily with the SubDrive Solar product and can
result in, but is not limited to, nuisance tripping, unsatisfactory performance, or drive damage.
Always consult the generator manufacturer for best-use practices.
24
MINIMUM RATING OF GENERATOR
KW
KW
0.55 2.5
1.1 5
2.2 10
Table 3: Generator Sizing
EXTERNALLY REGULATED
KVA
3.1
6.25
12.5