position, release (by hand) the holding brake. The load brake
should hold the test load. Again with the holding brake in the
released position start the test load down (first point) and
return the controller to the "off" position as the test load
lowers. The load brake should prevent the test load from
accelerating.
d.
Hoist Loss of Power Test (125 percent only): Raise the test load
to approximately 2400 mm 8 feet. While slowly lowering the test
load (first point), disconnect the crane's power source. Verify
that the test load does not lower and that the brake is set.
3.3.6.2
Trolley
Operate the trolley the full distance of the bridge rails in each direction
with a test load of 125 percent of rated load on the hook (one cycle).
Check proper functioning of all drive speed control points. Verify proper
brake action.
3.3.6.3
Bridge
With a test load of 125 percent of rated load on the hook, operate the
bridge for the full length of the runway in one direction with the trolley
at the extreme end of the bridge, and in the opposite direction with the
trolley at the opposite extreme end of the bridge (one cycle). Check
proper functioning of all drive speed control points. Check for any
binding of the bridge end trucks and verify proper brake action. Record
deficiencies. Secure from testing if deficiencies are found.
3.3.6.4
Rated Travel Tests
Repeat travel tests for trolley and bridge with a test load of 100 percent
of rated load. Repeat the test for 5 cycles at rated speed to demonstrate
proper operation and repeatability of all functions without the overheating
or malfunction of any components. Completely stop the machinery at least
once in each direction during each cycle to ensure proper brake action.
The machinery shall not be stopped for more than 15 seconds prior to
commencing the next cycle.
3.3.6.5
Trolley Loss of Power Test
With a test load of 100 percent of rated load, raise the test load
approximately midway between the trolley and any permanent obstruction on
the operating floor. Starting at a safe distance from walls or other
obstructions, attain a slow speed (first point) of trolley travel. While
maintaining a safe distance from obstructions, disconnect the main power
source at the wall mounted safety switch (disconnect) to simulate a power
failure. Verify that the trolley stops and that the brake sets properly.
Measure the distance required for the trolley to stop.
3.3.6.6
Bridge Loss of Power Test
With a test load of 100 percent of rated load, raise the test load
approximately midway between the trolley and any permanent obstruction on
the operating floor. Starting at a safe distance from walls or other
obstructions, attain a slow speed (first point) of bridge travel. While
maintaining a safe distance from obstructions, disconnect the main power
source at the wall mounted safety switch (disconnect) to simulate a power
failure. Verify that the bridge stops and that the brake sets properly.
SECTION 14636N
Page 19
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