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SSV-T and SSC-T High Drop-out Relay
4.4
INDICATING CONTACTOR SWITCH (ICS)
a. The indicating contactor switch has two taps that
provide a pickup setting of 0.2 or 2 amperes. To
change taps requires connecting the lead
located in front of the tap block to the desired
setting by means of a screw connection.
b. Trip Circuit Constants
0.2 amp tap - - - - - 6.5 ohms dc resistance
2.0 amp tap - - - - - 0.15 ohms dc resistance
5.0 SETTINGS
The relay must be set for the desired levels of volt-
age or current. The pickup of the relay is made by
adjusting the potentiometer in the front of the relay.
Setting in between the scale marking can be made
by applying the desired voltage or current and adjust-
ing the potentiometer until the telephone relay oper-
ates.
5.1
INDICATING CONTACTOR SWITCH (ICS)
The only setting required on the ICS unit is the selec-
tion of the 0.2 or 2.0 amperes tap setting. This selec-
tion is made by connecting the lead located in front of
the tap block to the desired setting by means of the
connecting screw.
The 0.2 amp tap is recommended for 125 or 250 volt
dc circuits. The 2.0 amp tap should be used on 24 or
48 volt dc circuits.
6.0 INSTALLATION
The relays should be mounted on a switchboard pan-
els or their equivalent in a location free from dirt,
moisture, excessive vibration and heat. Mount the
relay vertically by means of the four mounting holes
on the flange for the semi-flush type FT case. The
mounting screws may be utilized for grounding the
relay. External toothed washers are provided for use
in the locations shown on the outline and drilling plan
to facilitate making a good electrical connection
between the relay case, its mounting screws and the
relay panel. Ground Wires are affixed to the mount-
ing screws as required for poorly grounded or insulat-
ing panels. Other electrical connections may be
made directly to the terminals by means of screws for
steel panel mounting.
For detail information on the FT case refer to Instruc-
tion Leaflet 41-076.
7.0 ADJUSTMENT AND MAINTENANCE
The proper adjustments to insure correct operation of
this relay have been made at the factory and should
not be disturbed after receipt by the customer.
7.1
ACCEPTANCE TESTS
The following check is recommended to insure that
the relay is in proper working order. Refer to the
internal schematics and apply voltage or current to
the proper terminals.
1. Minimum Trip Current – Check pickup at mini-
mum and maximum settings. This is accom-
plished by applying the specified voltage or
current and checking the pickup of the output
telephone relay when the ac input is within ±5%
of the settings.
2. Dropout Ration – After checking pickup, gradu-
ally reduce the input. The dropout should be
greater than 92% and 90% of the pickup for
SSV-T and SSC-T relays respectively.
7.2
INDICATING CONTACTOR SWITCH (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts of
the ICS. This value of current should be not greater
than ICS's rated current. The operation indicator tar-
get should drop freely.
The contact wipe should be approximately 1/64" to
3/64". The bridging moving contact should touch both
stationary contacts simultaneously.
8.0 ROUTINE MAINTENANCE
All relay's calibration should be checked and con-
tacts should be cleaned at lease once every year. A
contact burnisher Style # 182A836H01 is recom-
mended for cleaning purpose. It is recommended to
change the potentiometer R2 every ten years.
41-766.7
3
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