2-4 Component Test Procedures
Performing Visual Inspections
Visually inspect the cooling tunnels and power structures before energizing
the drive.
Inspecting the Cooling Tunnels
1. Remove the main cooling fans from the bottom of the power structures.
Refer to Removing the Main Fans on page 3-26
.
2. Inspect the tunnels. Clean the heatsinks and tunnels if necessary.
Inspecting the Power Structures
1. Remove the covers from the power structures. Refer to Removing the
Covers from the Power Structures on page 3-15.
2. Check components for burn marks, breakage or foil delamination on
circuit boards. Check all the boards on the power structures, including
those on the Output Power Modules and the Rectifying Modules (if
present).
Replace any of these components without further testing if they show
evidence of burn marks, breakage or foil delamination.
Conducting Forward and
Reverse Biased Diode Tests
for Major Power Components
A forward biased diode test checks the semiconductor junctions between
the terminals and measures the voltage drop across those junctions. To pass
each test, the meter must display a voltage near 0.5V. If the test finds a
short, the meter will display “.000.” If the test finds an open circuit or
reversed polarity, the meter will display “.0L” (zero load).
A reverse biased diode test should find an open circuit, and the meter should
display “.0L” (zero load).
~.0L
+
-
~0.5V
+
-
Forward biased test
on PN-junction
Reverse biased test
on PN-junction
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