Emerson MPR15 Series Manuel D’Utilisation

Maintenance   75 

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NT5C06B / C   Installation and User Manual

 

The LVD voltage adjustment levels should be verified periodically 

(preferably at intervals no greater than one year). Refer to the “Fault 

diagnosis” section found at the end of this chapter for the verification 

procedure. When the verification has been completed, set the Test/Bypass 

switch to the Normal position. 

The DC connections on the main contactor should be tightened with a torque 

wrench set at 70 in.-lb. periodically (at one-year intervals) to avoid the build 

up of hot spots and voltage drops. 

Verify that the input AC voltage is within the specified limits. 

Cycle the AC breaker off/on to reset the unit from a possible HVSD 

shutdown. 

Make sure the HVSD potentiometer is adjusted properly. Refer to the “Start-

up procedure” section of the “Installation and start-up procedure” chapter of 

this manual for the adjustment procedure. 

If the unit is used in parallel with other units the rectifier may indicate an 

RFA alarm when the unit produces no current (see 

 below). This could 

mean that the float voltage is too low. Increase the float voltage by turning 

the FLT potentiometer clockwise until the ON/RFA led turns green. 

Triggers 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  

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Verify the front panel inrush current fuse (F1, 3/4 A, 250 V). A 

blown fuse on the MPR15E (NT5C06CB/CD/CE) may indicate that 

the input line voltage is too high. Refer to “Appendix C: 

Recommended replacement parts” to order a replacement fuse. 

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The unit must not be opened for on-site servicing. If a problem 

persists contact your local Astec representative.