5
OPM-152/A
UNIT CAPABILITIES
GENERATOR CONNECTIONS
CAUTION: EQUIPMENT DAMAGE
Check phase rotation. Improper phase rotation can result
in equipment damage.
WL12000HE: All models us wye (star) dedicated generator
ends that cannot be reconnected. All nameplate ratings
for amps and KVA are at a 0.8 PF. Some loads operate at
1.0 PF which will reduce the number of amps available but
not the available KW. See page 4 of this manual for 1.0 PF
amperage capabilities.
Each generator provides loads from three winding groups
of equal capacity. It is essential that care is taken to properly
balance the load between the winding groups.
When the load is connected between any line and
the neutral (example A), the load is concentrated on
one winding group with an amperage rating equal to
specification at 1.0 PF. You can create a balanced load by
dispersing your L-N loads between each leg.
When the load is connected between any Line to Line
(example B), the load is concentrated on two of the three
winding groups with an amperage rating equal to the
specification at 1.0 PF. You can create a balanced load by
offsetting connections.
A three phase load connected to all legs (example C), the
load is evenly split between all three winding groups. the
load can be at 0.8 or 1.0 PF.
You may run multiple connections types at the same time as
long as they do not exceed the machine’s nameplate rating.
Each connection type will reduce the amperage available
on each winding group.
STARTING ELECTRIC MOTORS
Electric motors require much more current (amps) to start
them than to run them. Some motors, particularly low cost
split-phase motors, are very hard to start and require 5 to 7
times as much starting current as running current. Capacitor
motors are easier to start and usually require 2 to 4 times
as much starting current as running current. Repulsion
Induction motors are the easiest to start and require only 1
1/2 to 2 1/2 times as much starting as running current.
N
A
L1
L2
L3
B
N
L1
L3
L2
C
N
L1
L2
L3
Most fractional horsepower motors take about the same
amount of current to run them whether they are Repulsion
Induction (RI), Capacitor (Cap), or Split-Phase (SP) type.
If the electric motor is connected to a hard starting load
such as an air compressor, it will require more starting
current. If it is connected to a light load, or no load such as
a power saw, it will require less starting current. The exact
requirement will also vary with the brand or design of the
motor.
Self-exciting generators respond to severe overloading
differently than utility power. When overloaded, the engine
is not able to supply enough power to bring the electric
motor up to operating speed. The generator responds with
high initial starting current, but the engine speed drops
sharply. The overload may stall the engine. If allowed to
operate at very low speeds, the electric motor starting
winding will burn out in a short time. The generator
winding might also be damaged.
CAUTION: EQUIPMENT DAMAGE
Running the generator set under these conditions may
result in damage to the generator stator as well as the
motor winding.
The heavy surge of current required for starting motors
is required for only an instant. The generator will not be
damaged if it can bring the motor up to speed in a few
seconds of time. If difficulty is experienced in starting
motors, turn all other electrical loads off and if possible
reduce the load on the electric motor.
