g.
Remarks
Record operating and startup current and motor terminal voltage
measurements for electrical equipment (motors) using appropriate
instrumentation (e.g., clamp-on ammeters). Recorded values shall be
compared with design specifications or manufacturer's recommended values;
abnormal differences (i.e., greater than 10 percent from manufacturer's or
design values) shall be justified or appropriate adjustments performed. In
addition, high temperatures or abnormal operation of any equipment or
machinery shall be noted, investigated, and corrected. Record hoist,
trolley, and bridge speeds during each test cycle.
3.2.2
Hook
Measure hook for hook throat spread before and after load test. Establish
a throat dimension base measurement by installing two tram points and
measuring the distance between these tram points (plus or minus 0.4 mm 1/64
inch). Record this base dimension. Measure the distance between tram
points before and after load test. An increase in the throat opening by
more than one percent from the base measurement shall be cause for
rejection.
3.2.3
No-Load Test
Raise and lower the hook through the full range of normal travel at rated
speed for three complete cycles. Then raise and lower the hook through the
full range of normal travel in slow speed. Verify proper operation of
hoist limit switches. Operate the bridge and trolley in each direction the
full distance between end stops; bring bumpers into contact with bumper
stops at each end of travel. Perform one complete cycle to check each
speed point and verify proper brake operation.
3.2.4
Hoist Load Test
Perform the following tests, as specified, with test loads of 100 and 125
percent (plus 5 minus 0) of rated load.
a.
Static Load Test (125 percent only): Check entire structure,
holding brake and hoisting components as follows: Raise the test
load approximately one foot. Hold the load for 10 minutes.
Rotate load and hook to check bearing operation. Observe lowering
that may occur which indicates a weakness in the structure or
malfunction of hoisting components or brakes.
b.
Dynamic Load Test (100 percent only):
Raise and lower the test load through the full lift height to test
limit switches. Check speed points during raising and lowering.
Lower the load to the floor, wait 5 minutes, then raise and lower
the load through two more cycles, in order to demonstrate proper
operation and repeatability of all functions without component
overheating or malfunction. Completely stop the machinery at
least once in each direction during each cycle to ensure proper
brake operation.
c.
Hoist Load Brake (125 percent only): Raise test load
approximately 1500 mm 5 feet. With neither pushbutton depressed,
release (by hand) the holding brake. The load brake shall hold
the test load. Again with the holding brake in the released
position, start the test load down (first point) and then release
SECTION 14637N
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