HANDSCOMB CONSULTANTS
LTD
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Phone : 0870 321 6400 Fax : 084458 65536 email : sales2009@handscomb.co.uk |
Company no: 3270189,
VAT: UK 686 1567 94 |
RELAY CARD TEST SYSTEM
The RELAY CARD TEST SYSTEM is
specifically designed so that it will reliably and quickly test relay matrix
modules and uncommitted relay modules in automated test systems and similar
industrial equipment. The product rapidly locates faults, whether they are
intermittent or continuous, in most standard relay boards and with the minimum
of intervention in the system. The relay modules can be tested in situ or as a
separate bench test, making the operation far more rapid and convenient.
We
can also provide a test & repair service for your relay modules if you do
not wish to commit yourself to a purchase at the present time, or if your test
department is not sufficiently big to justify purchasing the unit.
Patent
with patent no GB2412443.
Key Benefits
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Simple to Use |
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Increases
Production rate by reducing downtime |
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Increases
confidence in system |
Automated functional test equipment used in industry to
test electronic circuits typically consists of power supply units, dummy loads,
simulated signals and measuring instruments which are connected 'in' and 'out'
of the system by relays. At the present time, most of these relay modules do
not have any form of "self-test".
The test system facilitates the emergency repairing of
equipment that is in current use as well as that needing general overhaul. It
also enables reliable and rapid salvaging of modules from redundant equipment
and recycling them in new, with the added confidence that the new system will
give prolonged and economical use. These features will extend the life of relay
modules, achieve a much-reduced machine 'downtime' and give increased
confidence in the reliability of systems.
With the addition of a switch control unit, this can be
converted to a bench test system. Depending on the make the switch control unit
can be the normal card frame / controller used by the relay cards or a
universal one produced by Handscomb Consultants Ltd.
1.
To
check for permanently stuck ‘on’.
This
will find: -
Contacts
that have pitted so badly that the peaks on one surface have hooked into the
pits on the other surface.
Contacts
that have melted, due to high current and then welded together.
A
faulty output from an IC permanently energising a relay coil.
2.
To
check for relays which are permanently stuck ‘off’.
This
can be caused by: -
Contacts
too dirty or pitted to make good electrical contact.
A
coil not working or giving too weak a magnetic field to cause the contacts to
meet.
A
blown IC output.
A
dirty contact on the connector from the relay card.
3.
To
check the relay cards for manufacturing faults
(These
types of faults are rare but they do happen sometimes) These can be :-
A
short between two lines so that two rows or columns of relays may come on at
the same time.
A
short between two lines so that two relays may come on at the same time.
A
short between two output contacts between different relays.
Two
wires to the output connector crossed. This can only happen where the connector
is wired to the relay card rather than soldered directly to it.
4.
To
check relay contact resistance at the rated current.
This
will find dirty contacts and may point to some types of intermittent faults.
Even when they do not display the fault symptoms while testing, a higher than
normal resistance may highlight potential intermittent faults in this area.
5.
To
measure the speed at which contact is made.
This
will find the following faults: -
Weak
relay coils. These may cause intermittent faults. Even when they do not display
the fault symptoms while testing, a slower than normal response may highlight
potential intermittent faults in this area.
If
there is a known intermittent fault that has not been found the above tests can
be repeated continuously, over night if necessary, and any one-off faulty
action will be logged.
