P54/54
T-SM47j
APPENDIX 4 - ELECTRICAL SAFETY CHECKS
WARNING
These electrical safety checks should only be
undertaken in the following sequence.
The following three electrical safety checks should be
undertaken after all maintenance procedures have been
completed, with the covers on and the table in a ‘ready for
use condition’.
1.0
PAT testing
1.1
The table should be tested to ensure it conforms to
the current requirements for PAT (Portable Appliance
Testing) tests as detailed in the Eschmann Service
Schedule No. 2011.
2.0
Antistatic path resistance
2.1
The antistatic path resistance should be measured
using a ‘Megger tester’ switched to the 500V range as
follows.
2.2
Connect one probe of the ‘Megger’ to a side rail of
the table and the other probe of the ‘Megger’ to the surface
of a castor wheel, of the castor assembly, to which the
antistatic resistor is connected.
The reading should be 6.6M
Ω
± 10%.
2.3
Connect one probe of the ‘Megger’ to a side rail of
the table and the other probe of the ‘Megger’ to the surface
of any other castor wheel (i.e. not the one used in 2.2).
The reading should be >100M
Ω
.
3.0
Enclosure leakage current
3.1
Using Tool No. 110721 and a DVM (digital voltage
meter) test the enclosure leakage current of the table as
below. (Note that in the tests that follow, 1mV=1µA)
3.2
Connect Tool No. 110721 to the mains and plug the
table mains cord into the tool’s socket.
3.3
Connect the other end of the table mains cord into
the table’s mains inlet socket.
3.4
Connect the ‘Green’ socket of the tool to the
‘Enclosure leakage test probe’.
3.5
Connect the ‘Enclosure leakage test probe’ to a side
rail of the table.
3.6
Connect the cords from the DVM (either way round)
to the two ‘Black’ sockets of Tool 110721.
3.7
With switches 1 and 2 of the Tool ‘off’ and switch 3
‘on’, the DVM should read, ‘>10µA & <50µA’ (if <10µA or
>50µA there is a fault). Note reading for later. Disconnect
the ‘Enclosure leakage test probe’ from the table and the
DVM should read ‘0’.
3.8
With switches 1 and 3 of the Tool ‘on’ and switch 2
‘off’, the DVM should still read, ‘>10µA & <50µA’ (if <10µA
or >50µA there is a fault). Disconnect the ‘Enclosure
leakage test probe’ from the table and the DVM should
read ‘0’.
3.9
With switches 1,2 and 3 of the Tool all ‘off’ and the
‘Enclosure leakage test probe’ disconnected from the table,
the DVM should read the same as noted in 3.7.
3.10 If readings above are too high this could be that a
long mains cord is in use, if too low this could be mains
supply is not ‘on’, mains fuses in table have blown, fuse in
mains plug has blown, connection of equipment incorrect,
or there is a fault in the table (mains wiring has failed open
circuit).
3.11
Repeat sections 3.5 - 3.9 above but connect the
‘Enclosure leakage test probe’ to the middle two column
covers simultaneously instead of to the side rail.
Содержание T20-a
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Страница 52: ...P52 54 T SM47j Fig A2 T20 a Schematic diagram Pedestal Section...
Страница 53: ...T SM47j P53 54 T20 a OPERATION TABLE Fig A3 T20 a Schematic diagram Base Section...
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