AMETEK DLM 600W Series - Manual (Page 77)

DLM 600W Series
M362161-01 Rev J 5-3
5.3 Fuse Ratings
There are no user replaceable fuses in the power supply. Internal fuses are sized for
fault isolation, and, if they were open, would indicate that service is required. The
internal fuses are to be checked and replaced by qualified technical personnel. Refer to
Table 5–2 for a listing of the fuses.
REFERENCE DESIGNATOR FUSE RATING SIZE
F1, F2 20A, 250 VAC, Time–Delay 0.25”
 1.25”
F3 6.3A, 250 VAC; Type-F; 1,500AIC 5 mm
 20 mm
F4 3A, 250 VAC, Fast–Acting PWB Mounting
Table 5–2. Internal Fuses
5.4 Cleaning
Because the unit uses forced convection cooling, the air flow through the unit can pull in
dust. In environments having high concentrations of dust, periodic cleaning may be
required. The exterior of the unit should be cleaned with a mild solution of detergent
and water. The solution should be applied onto a soft cloth, and not directly to the
surface of the unit. To prevent damage to materials, do not use aromatic hydrocarbons
or chlorinated solvents for cleaning.
5.5 Calibration
Calibration is easily performed, requiring only a voltmeter, DC shunt, and programming
voltage source. Ensure that the accuracy of the test equipment is sufficiently better
than the specifications for the parameters to be calibrated. Typically, a 6 ½ digit
voltmeter is adequate for voltage measurements, and a shunt having a 0.1% tolerance
for current measurements. The shunt must be sized appropriately to minimize its
temperature rise, and the resultant variation of the measurement due to the shunt
temperature coefficient. Also, allow the unit to warm up for 30 minutes at no load prior
to performing the calibration.
WARNING
The calibration procedures are performed with the power supply top
cover removed and the power on. Potentially lethal voltages exist in the
power circuits and the output of high voltage models. Use insulated
tools when making adjustments to circuit potentiometers, and do not
touch any components or circuits.