May 30, 2019 - 04:19 PM
AVR is divided into many models. SX440 is a half-wave phase-controlled thyristor type Automatic Voltage Regulator (AVR) and forms part of the excitation system for a brush-less generator.
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).
An analogue input (A1 A2) is provided to connect to the Newage Power Factor Controller or other devices. It is designed to accept dc signals up to +1- 5 volts.
CAUTION Any devices connected to this input must be fully floating and galvanically isolated from ground, with an insulation capability of 500 V ac. Failure to observe this could result in equipment damage.
The dc signal applied to this input adds to the AVR sensing circuit. A1 is connected to the AVR 0 volts. Positive on A2 increases excitation, Negative on A2 decreases excitation.
The TRIM control allows the user to adjust the sensitivity of the input. With TRIM fully anti-clockwise the externally applied signal has no effect. Clockwise it has maximum effect.
Normal setting is fully clockwise when used with a Newage Power Factor Controller.