Areva MCAG 19, Руководство по обслуживанию, Страница: 7 / 16

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2.10 Output Contacts
Check that the output contacts close or open as appropriate.
Replace the cover and ensure that the cover reset mechanism will reset the
mechanical flag.
Connect the relay to the system as shown in the application diagram.
Replacing any links, wiring, fuses and remove any ct short circuits used during
commissioning.
Section 3. MAINTENANCE
Periodic maintenance is not necessary. However, periodic inspection and test is
recommended. This should be carried out every 12 months or more often if the
relay is operated frequently or is mounted in poor environmental conditions.
Routine testing of the relay can be performed by the secondary injection method,
as detailed in the commissioning instructions, Section 2.
Mechanical setting should be checked as per Section 4, and if any adjustment is
made, then Section 2 should be repeated.
Section 4. MECHANICAL SETTINGS
4.1 General
Armature gap measurements should be made with the top of the feeler gauge level
with the centre line of the core.
Contact pressures are measured with gramme gauge at the contact tips.
In general contact gaps and follow through are defined by quoting an armature gap
at which the tips should be just closed or just open.
The relay contact state is always defined with the relay in the unenergised position,
unless otherwise specified on the appropriate circuit diagram.
Contact Type Symbol used on diagrams
Normal duty
Make
(normally open) M
Break
(normally closed) B
With the armature closed the clearance between the back of the armature and the
back stop should be 0.003/0".008".
Nominal armature gap open 0.070"/0.080".
Nominal armature gap closed 0.070"/0.025"-adjustment by setting screw in
armature, lock and varnish after setting.