PI Manufacturing AC generators - Manual (Page 22)

Stop the generating set. Remove the link between terminals
K1-K2 at the auxiliary terminal block and connect a 5A switch
across the terminals K1-K2.
Turn the "I/LIMIT" control potentiometer fully anticlockwise.
Short circuit the stator winding with a bolted 3 phase short at
the main terminals. An AC current clip-on ammeter is required
to measure the winding lead current.
With the switch across K1-K2 open start the generating set.
Close the switch across K1-K2 and turn the "I/LIMIT" control
potentiometer clockwise until required current level is
observed on the clip-on ammeter. As soon as correct setting
is achieved open the K1-K2 switch.
Should the current collapse during the setting procedure, the
internal protective circuits of the AVR will have operated. In
this event shut down the set and open the K1-K2 switch.
Restart the set and run for 10 minutes with K1-K2 switch
open, to cool the generator windings, before attempting to
resume the setting procedure.
Important ! Failure to carry out the correct COOLING
procedure, may cause overheating and
consequent damage to the generator
windings.
6.6 POWER FACTOR CONTROLLER (PFC3)
This accessory is primarily designed for those generator
applications where operation in parallel with the mains supply
is required.
Protection against loss of mains voltage or generator
excitation is not included in the unit and the system designer
must incorporate suitable protection.
The electronic control unit requires both droop and kVAr
current transformers. When supplied with the generator,
wiring diagrams inside the back cover of this manual show the
connections and the additional instruction leaflet provided
gives details of setting procedures for the power factor
controller (PFC3).
The unit monitors the power factor of the generator current
and adjusts excitation to maintain the power factor constant.
This mode can also be used to control the power factor of the
mains if the point of current monitoring is moved to the mains
cables. Refer to the factory for appropriate details.
It is also possible to operate the unit to control kVAr of the
generator if required. Refer to the factory for appropriate
details.