Seaward B255 User Manual
Page 16
Operating Manual
Clare B255 Power Tool & Appliance Test Station
12
Functional Operation
Having established that the tool or appliance offers adequate protection to the
user it is also necessary to ensure that it operates correctly in all available
modes.
Although many tools and appliances can be seen to be working correctly, in
that they turn in the right direction or blow and suck when required etc. such
visual checks do not always tell the full story or give any indication of
impending failure. It is therefore recommended that measurements are also
made to determine the load currents of each function to check that they are
within the normal operating limits.
For motor driven tools such as drills, saws and angle grinders etc., the current
measurement is usually taken with the tool running in an ‘off-load’ condition.
This will generally give load current readings significantly lower than that
shown on the equipment rating plate, which is the maximum ‘on-load’ current.
The advice of the equipment manufacturer should be sought for meaningful
current values for all functions including ‘off-load’ running. The manufacturer
can also sometimes provide useful tips and hints as to the probable causes
for out-of-limit readings.
A satisfactory ‘load test’, as well as showing that the tool runs or operates,
also acts to validate the preceding Flash Test by proving that the supply
switch was ON and the circuit complete.
5.Introducing the B255
FIG.1 Facia Controls