Alpha Technologies AlphaGen 3.5_5.0kW Kohler COM5 - Manual (Page 11)

TP-6482 8/06 11 Section 1 Specifications
Section 1 Specifications
1.1 System Description
The COM5 generator set provides reliable backup DC
power to cable TV systems or telecommunication sites
in place of, or in addition to, batteries. The COM5 is
available in 36 and 48 VDC models. The generator set
nameplate indicates the unit’s rated voltage.
The system batteries provide power at 36 or 48 volts.
When power fails, the control system signals the
generator set to start. The generator set provides DC
power for continued or reserve operation of the system.
The COM5 generator set has both local and remote
annunciation and control capabilities. The unit runs on
natural gas or LP vapor.
1.2 Generator Set Functional
Description
The COM5 generator set system consists of the
generator set (engine and generator) and the control
system.
The generator set provides regulated DC
voltage to the telecommunications power system. The
control system provides complete control of the engine
and generator, accepts remote control commands, and
delivers local and remote annunciation of unit status.
Internal control functions include start and stop logic,
fault monitoring, unit voltage control, engine speed
(rpm) governing, and local LEDs for fault annunciation.
Status indicators include low oil pressure, high
temperature,
overspeed, overcrank, and engine
running.
Under very light loads, the generator set operates at low
speed. As loads increase, the control system maintains
constant generator output voltage by increasing the
generator set engine speed.
The Kohler CV14 engine drives a direct-connected,
variable-speed, 3-phase, voltage-specific generator to
produce high-frequency AC power.
A 3-phase, full-
wave rectifier in the control system rectifies the output to
produce low-ripple, unfiltered DC power. The DC inline
fuse provides protection for downstream devices in
case of overload.
1.3 Specifications
Figure 1-1, Figure 1-2, and Figure 1-3 contain
generator set, alternator, and engine specifications.
Refer to Section 3, Scheduled Maintenance, for service
details.
Item 36 VDC 48 VDC
Manufacturer Kohler
Dimensions,
L x W x H, mm (in.) 495 x 380 x 514
(19.5 x 15 x 20.24)
Weight, dry, kg (lb.) 68 (150)
Rated kW* 5 3.5 or 5 [
Rated voltage (after rectifier) 39 52
Rated amps 128 96
* Derate approximately 3.5% per 300 m (1000 ft.) over 600 m
(2000 ft.) above sea level. Derate 1% for each 5.5 °C (10°F)
increase in temperature above 49 °C (120°F).
[ Check the generator set nameplate for the kW rating.
Figure 1-1 Generator Set Specifications
Item 36 VDC 48 VDC
Stator resistance, ohms 0.014 0.024
Stator type 3-Phase, 3-Lead,
Ungrounded
Excitation method (rotor) Permanent-Magnet,
Brushless
Coupling type Direct-to-Engine
Insulation (stator) Class 155, Epoxy
Varnish,
Vacuum-Impregnated
Winding material Copper
Stator-to-alternator adapter bolt torque,
Nm (ft. lb.) 11 (8.1)
Flywheel-to-shaft bolt torque, Nm (ft. lb.) 67 (49.4)
Rotor-to-flywheel bolt torque, Nm (ft. lb.) 38 (28.0)
Fan-to-flywheel bolt torque, Nm (ft. lb.) 25 (18.4)
Figure 1-2 Alternator Specifications