Emerson NT5C06D user manual High voltage shutdown Hvsd, Cooling fan, Fan failure

42 Maintenance

Procedure 6 - Adjusting the float / equalize ( continued )

Step Action

6The float voltage should be adjusted with the rectifier in service, as follows:

The rectifier is connected to the system and should carry some load. If the rectifier is connected in parallel with other rectifiers, verify that the total system load current is shared equally among the rectifiers. If the current reading is too low, or nil, slowly increase the FLT potentiometer, by turning it clockwise, until sharing is achieved. If the current reading is too high, or the unit is in the current limit mode, decrease the FLT potentiometer by turning it

counterclockwise.

end

High voltage shutdown (HVSD)

To verify or readjust the HVSD follow steps 5 to 8 of the “Rectifier Startup and Verification” section of this manual.

Cooling fan

Visually inspect the airflow intake for any obstruction by foreign objects, or excessive dust and dirt build-up. Open both the AC and DC breakers and remove the rectifier from the power shelf. Inspect the air outlet for obstruction by foreign objects, or excessive dust and dirt build-up. Visually inspect the air outlet of the enclosure or cabinet. If a problem is detected in the rectifier, contact your local Astec service facility. The unit is not designed for on site servicing.

CAUTION

Do not attempt to access the inside of the unit with a tool or a finger. Severe electrical shock could result.

Fan failure

If a fan alarm persists after the fan filter and assembly has been cleaned, replace the fan assembly as follows:

UM5C06D ( 169-2071-504 ) P0831010 Standard 7.00 May 2001