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GEK-90636
CONSTRUCTION
The components of the relay are mounted on a cradle assembly that can easily be
removed from the relay case. The cradle is locked in the case by latches at the top and
bottom. The electrical connections between the case blocks and the cradle b1ocks are
completed through removable connection plugs to permit testing the relay in its case.
The cover is attached to the front of the case and includes two interlocking arms that
prevent the cover from being replaced until the connection plugs have been inserted.
The case is suitable for semi-flush mounting on panels. Hardware is available for
all panel thicknesses up to two inches. A panel thickness of 1/8 inch will be assumed
unless otherwise specified on the order. Outline and panel drilling dimensions for the
SFF2O1 are shown in figure 8 and for the SFF2O2 and 204 figure 7.
The printed circuit boards are mounted behind the nameplate and can be accessed
by removing the four screws securing the nameplate. The boards are mounted
horizontally in guides. Each board is labeled to correspond to a given location. Use
GE part number 286A2847P1 card puller or other suitable means to remove the
circuit boards. If you do not have a card puller, be careful not to damage or bend any
components when removing the boards.
The output relays are mounted in sockets on a board fixed to the back of the
cradle. If a relay requires replacement unclip the retaining wire and pull the relay
out of the socket.
The input transformer is mounted on the bottom plate of the relay cradle.
RECEIVING, HANDLING AND STORAGE
This relay contains electronic components that could be damaged by electrostatic
discharge currents if those currents flow through certain terminals of the
components. The main source of electrostatic discharge currents is the human body,
and the conditions of low humidity, carpeted floors and isolating shoes are conducive
to the generation of electrostatic discharge currents. Where these conditions exist,
care should be exercised when removing and handling the modules to make settings
on the internal switches. The persons handling the module should make sure that
their body has been discharged, by touching some surface at ground potential, before
touching any of the components on the modules.
These relays, when not included as part of a control panel, will be shipped in
cartons designed to protect them against damage. Immediately upon receipt of a
relay examine it for any damage sustained in transit. If damage resulting from
handling is evident, file a damage claim at once with the transportation company and
promptly notify the nearest General Electric Sales Office.
The relays should be stored in their original cartons. If the relays are not to be
installed immediately, and in a place that is free from moisture, dust and metallic
chips.
ACCEPTANCE TESTS
General
The relay should be examined and tested upon delivery to insure that no damage
has been sustained in shipment and that the relay is functioning correctly.
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