Emerson 200I/48-NT5C05C Manuel D’Utilisation

40   Functional description 

UM5C05C   P0745680   Standard 6.00   October 2001 

Use this potentiometer to set the internal threshold level at which the local 
high voltage shutdown condition should occur. 

In addition to the local high voltage shutdown feature, the controller of the 
power plant controller can shut down any rectifier by sending a high 
voltage shutdown signal, ground ( BAT RTN ) pulse. The rectifier will 
shut down within 50 ms if it is supplying more than 10% of its full load 
rating. 

As is the case for the internal high voltage shutdown condition, two HVSD 
events must occur within an interval of two minutes to lock out the 
rectifier permanently. An ac breaker reset or an HVSDR signal can be 
used to restart the rectifier. 

The rectifier may be reset from an HVSD condition locally by : 

• 

toggling the ac circuit breaker to OFF then to ON ( or the ac 
breaker in the distribution panel ) 

• 

sending a remote ground signal to the HVSDR input through the 
controller restart ( provided the 'TR' lead has not been activated ) 

The TR input can be interfaced to an external sequential start circuit.