AMETEK DLM Series - Manual (Page 34)

Installation DLM-E 3kW & 4kW Series Power Supplies
2-10 M362000-01 Rev E
2.7 Initial Functional Tests
Before connecting the unit to an AC outlet, make sure that the POWER switch is in the Off
position, (down) and that the voltage and current control knobs are turned fully counter–
clockwise. The two smaller switches directly to the right of the POWER switch should be
depressed up to put the unit in the ENABLE and LOCAL position. Check that the J3 mating
connector on the rear of the unit has no jumpers installed on it and that the rear panel DIP
switch, S1, settings are all in the UP (1) position. (This is the default configuration as shipped
from the factory). Connect the unit to the proper AC power source and turn the POWER switch
on. After a 1–2 second power–on delay, the front panel meters should light up with both
displays reading zero. The S/D (shutdown) indicator will blink momentarily and then the ON and
VOLT MODE indicators should be illuminated.
To check voltage mode operation, proceed as follows:
• Connect a DVM, rated better than 0.5% accuracy, to the rear output terminals, observing
correct polarity.
• Rotate the CURRENT control ½ turn clockwise. Slowly rotate the VOLTAGE control
clockwise and observe both the internal and external meters. The control range should
be from zero to the maximum rated output. Compare the test meter reading with the front
panel voltmeter reading. Check that the green VOLTAGE MODE indicator is ON.
• Set the POWER switch to OFF. Note that the internal fans will continue to run for about
10 seconds.
To check current mode operation, proceed as follows:
• Rotate the VOLTAGE and CURRENT controls fully counterclockwise.
• Rotate the VOLTAGE control ½ turn clockwise.
• Connect a high current DC ammeter or current shunt across the rear output terminals,
observing correct polarity. Select cables of sufficient current carrying capacity and an
ammeter range compatible with the unit's rated current output. The ammeter/shunt
should have an accuracy of better than 0.5%.
• Set the POWER switch to ON.
• Rotate the CURRENT control slowly clockwise. The control range should be from zero to
the maximum rated output. Compare the test meter reading with the reading on the front
panel ammeter. Check that the green CURRENT MODE indicator is ON.
• Set the POWER switch to OFF. Note that the internal fans will continue to run for about
10 seconds.
2.8 Load Connection
Reliable performance of the DLM–E power supply can be obtained if certain basic precautions
are taken when connecting it in a system. To obtain a stable, low noise output, careful attention
should be paid to factors such as conductor ratings, system grounding techniques and the way
in which the load and remote sensing connections are made.