xvii. Secure the brush block assembly using the
remaining four screws Ref.34. DO NOT
OVER TIGHTEN.
xviii. Finally check that all cables are well clear
of moving parts before refitting the guard
wall and securing with the 3 Screws Ref.82..
Note: To inspect and replace the motor brushes while
retaining the brush block assembly in place repeat
the procedure xiv. to xviii. above.
1.
Examine the power cable and handle cable for
damage, if the outer insulation shows more than
the slightest of abrasions or the inner conductors
are exposed then the cable must be replaced.
The cables must not be repaired with tape or
insulation sleeve.
2.
Open and check mains plug and interconnecting
socket Ref.24 for condition, loose connections,
damaged wires etc. Ensure that the strain relief
of the power cable plug is correctly secured to the
outer cable insulation.
3.
Open and examine the Switch Housing Ref.11
for loose connections, damaged wires, and
general condition. Pay special attention to any
gaskets, 'O' rings and seals intended to exclude
dust from the switch and switch housing area,
these must be maintained in good condition.
4.
Ensure that the Strain Relief Ref.5 is correctly
secured to the outer cable insulation.
Note: The Pacific Rhino PFS 8 Drum Sander features
a fully protected circuit breaker which incorporates
'Low Volt Protection'.
This means that should the
mains supply be interrupted during use the switch will
immediately return to the 'OFF' position to protect the
operator. This feature, by preventing a circuit through
the switch unless mains voltage is present, also
prevents a full insulation (flash) test unless the test
instrument has '
' facility.
If your instrument has this facility then:- replace the
switch cover 'A' taking care to avoid trapping leads
and ensuring that all dust gaskets are correctly
positioned.
Check that the circuit breaker 'ON'
button does not lock in the 'ON' position when
depressed.
The button must only lock 'ON' when
current is present. Before carrying out test ensure that
the motor is connected by the twist lock socket Ref. 24
and that all safety measures have been taken.
Electrical Testing
CAUTION - testing for electrical safety
should be undertaken by a competent
person and all results recorded. Do not
exceed 1250 volt insulation test duration
of 3 seconds.
test on run
10
Carry out 'test on run' procedure.
If your instrument does not have 'test on run' facility
then Continue as follows:-
5.
While you have the switch housing open for
visual inspection remove the circuit breaker
cover 'B' together with the 'low volt coil 'C'(see
below). Do not disconnect or disturb any cables.
The 'low volt coils will remain within the cover 'B'.
The circuit breaker will now lock into the 'ON'
position without current present. Before carrying
out an insulation (flash) test ensure that the motor
is connected by the twist lock socket Ref. 24 and
that all safety measures have been taken.
6.
Use the standard test for electrical safety for a
grounded (earthed) appliance. Do not exceed
1250 volt insulation test duration of 3 seconds
7.
Record the test results.
8.
Complete a functional (run) test and record
results.
9.
After carrying out the tests disconnect the
machine from the test station and snap the 'Low
Volt Coil' 'C' back into position and replace cover
'B'.
10. Replace the switch cover 'A' taking care to avoid
trapping leads and ensuring that all dust gaskets
are correctly positioned. Check that the circuit
breaker 'ON' button does not lock in the 'ON'
position when depressed. The button must only
lock 'ON' when current is present.
11. Finally test the machine once again to ensure
good earth and insulation of the mains cable
and switch.
Do not exceed 1250 volt flash
duration of 3 seconds.
CAUTION - when undertaking a
functional test ensure that the machine is
secure, remember the sanding drum will
rotate, ensure that the drum cannot come
into contact with the work bench/service
area.
