Kubota SQ-1120, Operator'S Manual, Page: 22 / 63

7 PREPARATION TO SUPPLY THE ELECTRIC POWER
2. Recommended capacity of electrical
devices
APPLICATION RANGE
You can operate the SQ-series generator in the following
range.
A
Keep an inverter load below 40% of the generator
capacity.
A
Keep a mercury lamp load below 60% of the generator
capacity.
A
Make sure that total active mercury lamp load is below
30% or so of the generator capacity. Turn on the
mercury lamps one by one. Be careful not to turn off
the lamps and on again immediately. The generator
voltage may rise to extremely high levels and the AVR
may get damaged.
A
Before turning on the lamps again, wait for 10 minutes
or so until the lamps cool down enough.
A
The data shown above is only a guideline to
approximate load capacities and may vary from
generator model to generator model, with different
types of loads at rated outputs. These values may be
different from actual applications because of the input
characteristics peculiar to each load.
A
Connecting a motor.
When connecting to a line starting motor, these
generators may be used to start a submerged pump of
5.5kW, 7.5kW, 11.0kW (three phase). When starting
the motor, the voltage drops immediately. The circuit
may be opened if an electromagnetic switch is
connected to the same circuit. When connecting two
motors or more, make sure the total current capacity
of the motors does not exceed the total rated current.
A
Connecting to lights and electric heaters.
When connecting to lights or electric heaters, the
generator can be used up to the rated capacity. When
using a single phase, it can be used up to the rated
current.
A
Power factor calculations.
The power factor calculation is used to determine
input of the electrical devices.
Power factors of commonly used devices are listed in the
following table.
A
Ordinarily, a motor is rated in kW. This does not refer
to motor output.
A
If a lighting system is employed together with some
types of computers and inverter air-conditioners and/
or the regulated power supply for TV sets, the lights
might suffer flickering. This phenomenon does not
indicate a fault of the generator: it is caused by poor
matching between the above-mentioned regulated
power supply and the generator's automatic voltage
regulator. In such a case, modify the load combination
to eliminate the flickering.
Typical
Apparatus
Light and
heaters
Commutator
motor
Induction
motor
SQ-1120
11.2 kVA 7.0 kVA
---
(5.6 kW)
9.5 kVA
(7.6 kW)
8.5 kVA
(6.8 kW)
12.5 kVA
(10.0 kW)
19.0 kVA
(15.2 kW)
---
5.5 kW (7.5 HP)
3 Phase
7.5 kW (10 HP)
3 Phase
11 kW (15 HP)
3 Phase
(11.2 kW)
15.0 kVA
(15.0 kW)
11.2 kVA
(11.2 kW)
16 kVA
(16 kW)
24 kVA
(24 kW)
SQ-1150
SQ-3140
SQ-3200
SQ-3300
AC devices
Electric power (W)
= Voltage (V) Current (A) Power factor
Load type Power factor
Single-phase induction motors 0.4 to 0.75
3-phase induction motors 0.65 to 0.85
Electric heaters, incandescent
lamps
1.0
AC arc welder 0.4 to 0.6
Commutator motor 0.8 to 0.95
Fluorescent lamps, mercury
lamps
0.4 to 0.9
Motor input (kVA)
Motor output (kW)
Motor efficiency power factor
=
1G296-8914.book 7 ページ ２０１２年３月１９日 月曜日 午前１０時４０分