Winco SX460 - Manual (Page 4)

FITTING AND OPERATING
TD_SX460 AVR GB_04.05_06_GB
Barnack Road • Stamford • Lincolnshire • PE9 2NB
Tel: 00 44 (0)1780 484000 • Fax: 00 44 (0)1780 484100
© 2005 Cummins Generator Technologies Limited.
STABILITY ADJUSTMENT
The AVR includes a stability or damping circuit to provide
good steady state and transient performance of the
generator.
The correct setting can be found by running the
generator at no load and slowly turning the stability
control anti-clockwise until the generator voltage starts to
become unstable.
The optimum or critically damped position is slightly
clockwise from this point (i.e. where the machine volts
are stable but close to the unstable region).
UNDER FREQUENCY ROLL OFF (UFRO)
ADJUSTMENT
The AVR incorporates an underspeed protection circuit
which gives a volts/Hz characteristic when the generator
speed falls below a presettable threshold known as the
"knee" point.
The red Light Emitting Diode (LED) gives indication that
the UFRO circuit is operating.
The UFRO adjustment is preset and sealed and only
requires the selection of 50 / 60Hz using the jumper link.
For optimum setting, the LED should illuminate as the
frequency falls just below nominal, i.e. 47Hz on a 50Hz
system or 57Hz on a 60Hz system.