Operating instructions

INSTALLATION
2-12 46882-311D
Check that the equipment has been installed in accordance with the instructions provided (e.g. that
ventilation is adequate, supply isolators are accessible, supply wiring is adequate and properly
routed).
The condition of the mains supply lead and supply connector(s).
Check that the mains supply switch isolates the Service Monitor from the supply.
The correct rating and type of supply fuses.
Security and condition of covers and handles.
Check the supply indicator functions (if fitted).
Check the presence and condition of all warning labels and markings and supplied safety
information.
Check the wiring in re-wireable plugs and appliance connectors.
If any defect is noted this should be rectified before proceeding with the following electrical tests.
2. Earth bonding tests
Earth bonding tests should be carried out using a 25A (12V maximum open circuit voltage) DC
source. Tests should be limited to a maximum duration of 5 seconds and have a pass limit of 0.1
Ω
after allowing for the resistance of the supply lead. Exceeding the test duration can cause damage
to the equipment. The tests should be carried out between the supply earth and exposed case
metalwork, no attempt should be made to perform the tests on functional earths (e.g. signal
carrying connector shells or screen connections) as this will result in damage to the equipment.
3. Insulation tests
A 500 V DC test should be applied between the protective earth connection and combined live and
neutral supply connections with the equipment supply switch in the ‘on’ position. It is advisable to
make the live/neutral link on the appliance tester or its connector to avoid the possibility of
returning the Service Monitor to the user with the live and neutral poles linked with an ad-hoc
strap. The test voltage should be applied for 5 seconds before taking the measurement.
IFR Ltd employs reinforced insulation in the construction of its products and hence a minimum
pass limit of 7 M
Ω
should be achieved during this test.
Where a DC power adapter is provided with the Service Monitor the adapter must pass the 7 M
Ω
test limit.
We do not recommend dielectric flash testing during routine safety tests. Most portable appliance
testers use AC for the dielectric strength test which can cause damage to the supply input filter
capacitors.
4. Rectification
It is recommended that the results from the above tests are recorded and checked during each
repeat test. Significant differences between the previous readings and measured values should be
investigated.
If any failure is detected during the above visual inspection or tests, the Service Monitor should be
disabled and the fault should be rectified by an experienced Service Engineer who is familiar with
the hazards involved in carrying out such repairs.
Safety critical components should only be replaced with equivalent parts, using techniques and
procedures recommended by IFR Ltd.
The above information is provided for guidance only. IFR Ltd designs and constructs its products
in accordance with International Safety Standards such that in normal use they represent no hazard
to the operator. IFR Ltd reserves the right to amend the above information in the course of
continuing its commitment to product safety.