2.4 ELECTRICAL INSPECTION
To ensure that no internal damage was incurred during shipment, a preliminary test should be
performed as follows:
A. Rotate Voltage and Current knobs completely counter clockwise.
B. Apply appropriate AC input power to the supply. With no load connected to the output
terminals, flip ON the
circuit breaker of the supply. The internal fans should start
immediately. The power supply should turn on after an approximate five second delay.
The main AC breaker should not be cycled on and off any sooner than 30 seconds. This
will ensure proper operation of the soft start circuitry. The status of the indicators is as
follows:
i) POWER ON indicator is glowing.
ii) OVER VOLTAGE indicator is off
C. Rotate the current knob clockwise.
D. Rotate the voltage knob completely clockwise. The front panel's voltmeter should
display the maximum output voltage of the supply. The voltage indicator should glow.
E. Rotate the current knob completely counter clockwise; the output voltage should drop to
zero.
F. Rotate the current knob clockwise. The output voltage should rise to its original value.
Rotate the OVP potentiometer counter clockwise. The output voltage should drop to
zero volts.
G. Since the OVP circuitry latches on itself, rotate the OVP potentiometer
completely clockwise. Flip the circuit breaker OFF, wait 10 seconds and then flip the
circuit breaker ON to reset the OVP. The voltmeter should display the output voltage.
H. Rotate the voltage knob completely counter clockwise and monitor the front panel
voltmeter. The output voltage should gradually decrease to zero. Rotate the current
knob completely counter clockwise. Flip OFF the circuit breaker of the supply.
I.
Apply a short across the output terminals of the supply. Make sure that the short can
sustain the maximum output current of the supply. Refer to Table 3.3 (Section 3.11) for
recommended wire size.
J.
Flip ON the circuit breaker of the supply. Rotate the voltage knob clockwise. Rotate the
current knob completely clockwise. The front panel ammeter should display the
maximum output current of the supply. The current indicator should glow.
K. Rotate Current knob completely counter clockwise. The output current should drop to
zero. Flip OFF circuit breaker.
If any inconsistency from the above test procedure is noted, please do not hesitate to call
Lambda EMI Customer Service for assistance.
83-473-000 Revision J
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Inspection and Installation
