INTRODUCTION

The SCP 250 controls generator (SCP 250-G) or motor (SCP 250-M) power factor or vars by monitoring

the voltage and current and supplying a control input to a voltage regulator.

When the SCP 250 is controlling vars, the voltage regulator (or static exciter) output changes to attain the

selected reactive load current.

When the SCP 250 is controlling power factor, the voltage regulator adjusts the excitation until the

selected power factor is obtained.

The SCP 250 monitors the open/closed state of the circuit breaker so that the voltage regulator controls

excitation when the breaker is open and the SCP 250 controls excitation when the breaker is closed.

A voltage limiting feature in the SCP 250 prevents the voltage regulator from supplying full or no

excitation if utility power is lost and the peaking generator main breaker remains closed. Voltage limiting is

adjustable between ±10% and ±30%.

Because the SCP 250 is designed for behind-the-panel mounting, provisions are included for locating the

Var/PF switch and potentiometer remotely.