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RESTORING RELAY TO SERVICE
After the hipot testing is completed, the surge capacitors should be reconnected to
the surge capacitor buses, the surge capacitor buses reconnected to studs 6 and 16, and all
external wiring to terminals 6 and 16 (surge ground) should be reconnected.
Mount the relay vertically in a clean, dry and well lighted place to allow accessibility
for cleaning, inspection and testing, and where it will not be subjected to excessive
vibration or heat. Unless mounted on a steel panel that adequately grounds the relay case,
the case should be grounded through a mounting stud or mounting screw with a conductor
not less than #12 AWG copper wire or its equivalent. It may be necessary to remove paint
from the case at the point of connection to ensure reliable contact.
Terminal 6 {bottom surge ground) should be connected to the lower case-mounting
stud and terminal 16 {top surge ground) should be connected to the upper case-mounting
stud using #12 AWG copper wire. Also, terminals 6 and 16 should be tied together with
# 12 AWG copper wire to insure adequate grounding {see external jumpers in Figures 1
through 4).
Check the nameplate to be sure that the relay is the desired model number. The
section on
ACCEPTANCE TESTS
want to perform as part of the installation procedure.
SEITING THE TAP OF THE TARGET SEAL-IN UNIT {SPA11B and 12B)
The contact adjustment will not be disturbed if the following procedure is followed
when changing the tap. Take either one of the two screws from ttie left contact plate and
transfer it to the desired tap position in the right tap plate. Then remove the screw from
the undesired tap position in the right tap plate and transfer it to the vacant location in the
left contact plate. Do
plate.
SUPPLY VOLTAGE SETTING
Be sure to set the two selector pins on the printed circuit containing the power supply
{left-hand board in the sending-end relays, only board in the receiving end relays) to
correspond with the station battery voltage. For SPA relays with REV A on the nameplate
there is only one power-selection link to set. Place in the setting corresponding to the
station battery. For the SPA 11 B and 12B, which contain the transfer-trip feature, it is also
necessary to set a link above the target seal-in unit.
TERMINAL ARRANGEMENT SETTING
The SPA 12A and 12B receiving-end relays are to be set for either a two- or a three
terminal arrangement. This is accomplished by positioning a selector pin on the printed
circuit board. The positions are clearly labeled on the board.
GEK-65512
INSTALLATION PROCEDURE
contains all the tests that the user, at his discretion, may
leave the unit with screws in
not
the tap locations of the right
both
17
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