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GEK-100636
CONSTRUCTION
The components of the relay are mounted on a cradle assembly that can easily be removed from
the relay case, refer to Figures 14 through 17. The cradle is locked in the case by latches at the
top and bottom. The electrical connections between the case blocks and the cradle blocks are
completed through removable connection plugs, as shown in Figure 18, 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.
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. 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.
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.
The persons handling the module should make sure that their body charge has been discharged, by
touching some surface at ground potentia l, 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.
If the relays are not to be installed immediately, they should be stored in their original cartons,
and in a place that is free from moisture, dust and metallic chips.
INSTALLATION PROCEDURE
The relay should be installed in a clean, dry location, free from dust and excessive vibration. It
should be mounted on a vertical surface. The outline and panel-drilling dimensions are shown in
Figure 19.
Surge Ground
The case stud should be permanently connected to ground by a conductor not less than AWG No.
12 copper wire or equivalent. This connection is made to ground the relay case and the surge-
suppression networks in the relay. The surge-ground lead should be as short as possible,
preferably 10 inches or less, to provide maximum protection from surges. Figure 16 shows the
rear view of an M2 case, illustrating the position of the case-grounding stud.
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