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Easy-Start ES Instruction Manual
Troubleshooting
SECTION 5
5-8
SCR Diagnostic Tests
Pre-Start
-
Review Cutler-Hammer recommended
procedures for mounting ÒdiscÓ power
semiconductors (refer to W SCD Mounting Kit
instructions).
-
CAUTION: Deficient heat sink materials may
creep or cold flow, relax, deflect with time and
temperature under these high load forces.
Stack assemblies must be thoroughly
checked at design ratings.
-
Spring load bar epoxy insulation coating is
rated at 130¡C NEMA B, 5000V RMS.
Maximum sink temperature is restricted to
90¡C maximum because of the high load
forces used in clamping (high current) power
semiconductors.
Stack Pre-Assembly
Step 1: Assemble sink-device clamp parts
(reference clamp drawing, Figure 5-1).
Notice
-
It is recommended that a lubricant be
used on the clamp bolt threads.
Never-Seez,
Anti-Seize lubricant compound, Type NSBT
, is
suitable material for this purpose.
Stack Pre-Load
Step 2: If an inch-pound torque wrench is
available, torque each clamp nut to 20
in-lbs.
Notice
-
This torque value is valid for well-
lubricated threads only.
Should a torque wrench not be available,
finger tighten each nut until snug; then
turn each nut 1/4 turn with a wrench.
Parts should now be held firmly.
Step 3: Check to make sure that load bars and
heat sinks are parallel; equal lengths to
thread may not show through each nut
because of bolt length tolerances. (If
load bars/sinks are not parallel, redo
Step 2).
Stack Loading
Step 4: Insert a set of "vernier calipers" or other
suitable depth gauging instrument
through the hole in the uncoated bar.
This gauge must be long enough to
extend through the load bar and touch
the hardened disc (approximately 2.30").
See Figure 5-4.
Step 5: Measure and record an initial reading of
this distance ÒXÓ.
Step 6: Turn each nut 1/4 turn at a time until a
relative displacement at ÒXÓ of 0.034" is
obtained. This results in 10,000+
pounds force.
Stack Inspection
Step 7: Check load bars and heat sinks for
parallelism. Apply a hi-temp paint over
the clamp bolt/nut mating surfaces to fix
their properly tightened original position
(tamper indicator).
Step 8: Check stack assembly electrical values
per device specifications.
StockCheck.com