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42 Maintenance
UM5C06D ( 169-2071-504 ) P0831010 Standard 7.00 May 2001
Procedure 6 - Adjusting the float / equalize ( continued )
Step Action
6 The 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: