Maintenance; Mechanical Settings; General; With The Armature Closed The Clearance Between The Back Of The Armature And The Back Stop Should Be 0.075/0.2Mm (0.003"/0.008") - GE MVAX 11 Technical Manual

Service Manual
MVAX
3.

MAINTENANCE

Periodic maintenance is not necessary.
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.
Tests 2.3, 2.4, 2.5, 2,6 and 2.7 should be carried out to prove operation.
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 a 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
Make
(Normally open)
Break
(Normally closed)
4.1.1 With the armature closed the clearance between the back of the armature and the back stop
should be 0.075/0.2mm (0.003"/0.008").
4.1.2

Nominal armature gap open.

MVAX 11
MVAX 12
MVAX 21, 31 and 91
MVAX 21
MVAX 31, 91
Note:
Symbol used on diagrams
Normal duty
Unit RL
1
Unit RL
1
Unit RL
2
Unit RL and RL
2
On the MVAX 12 a screw is fitted to the armature.
It must protrude by 0.075/0.2mm (0.003"/0.008").
However, periodic inspection and test is
M
B
1.38mm (0.055")
1.5mm (0.060")
0.7mm (0.030")
3
R8010RB
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