Emerson MPR15 Series User Manual

Operation   23 

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NT5C06B / C   Installation and User Manual

 

The rectifier incorporates facilities for monitoring its operational state and 

extends a global alarm upon detection of an internal failure or a no load 

condition (see Note below).  When the rectifier operates in parallel with 

other rectifiers and its output voltage is adjusted lower, the RFA LED will 

change to RED and an RFA alarm will be sent. 

Give an alarm at no load condition only for the following 

releases or under. 

NT5C06BB, BB-1, BB-3, BC 

Rel. 10 

NT5C06CA, CA-1, CA-3, CA-5 ,CC 

Rel. 10 

NT5C06CB, CB-1, CB-3, CD 

Rel. 12 

NT5CO6CE-61(-46)  

Rel. 12  

A fan failure will activate the fan alarm and inhibit the operation of the 

rectifier. An RFA will also be issued upon inhibition of the rectifier. 

The rectifier includes a high voltage monitor. Whenever the rectifier output 

voltage exceeds a value adjustable from -52 to -59.5 V it shuts down 

immediately, locks out, and transmits an RFA. This function is not 

dependent on the output load condition. 

Circuit breakers are used to turn the rectifier ON/OFF locally and 

disengage it from the DC circuit. The local OFF control overrides the 

remote control signals. 

A 3/4 A, 250 V fuse is connected in line with the soft start circuitry to 

protect the input circuitry against high inrush currents in case of an 

internal failure. On the MPR15E modes NT5C06CB/CD/CE, failure 

of this fuse during operation will disable the unit. See the 

“Recommended Replacement Parts” section to order a replacement 

fuse.