Seaward B255 - Manual (Page 31)

Operating Manual Clare B255 Power Tool & Appliance Test Station
27
Fault Indication
A zero current reading and non-operation of the product may indicate an open
circuit Line or Neutral path – release the test button first and check that
switches on the product operate correctly.
If the switches appear to operate correctly, there may be a break in the supply
lead and if this is the case any previous safety tests will be invalid. On the
other hand, if any switches are not operating correctly they may well have
been OFF during the safety tests, again creating an invalid test. In either case
complete re-testing will be required once the problem has been resolved.
A current in excess of the manufacturer’s specifications may indicate, among
other things, a short-circuit heating element, out of balance field coil windings,
tight bearings or even a tight gear train.
A really serious fault, such as a short circuit, will trip the SUPPLY mcb on the
instrument or external supply and may even blow supply fuses. Disconnect
the appliance before re-setting the mcb and also check plug top and switch
board fuses if the instrument SUPPLY lamp now fails to operate.
All suspected faults must be investigated and corrected by qualified
personnel and the product FULLY re-tested.