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41-766.7
9.0 CALIBRATION
Use the following procedure for calibrating the relay if
the relay adjustments have been disturbed. This pro-
cedure should not be used until it is apparent that the
relay is not in proper working order. A new scale
plate may be necessary when parts are changed.
Dial Calibration –
1. Connect an ohmmeter across the relay terminals
which connect to the telephone relay contacts.
2. Apply the desired voltage or current to relay ter-
minals 8 and 9.
3. Turn potentiometer on the front of the relay
counter-clockwise from extreme clockwise posi-
tion until the relay operates as indicated by the
ohmmeter reading.
Figure 1:
Block Diagram of the Type SSV-T Relay in the
Type FT-11 Case
4
9.1
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 not be greater
than the particular ICS tap setting being used. The
operation indicator target should drop freely.
For proper contact adjustment, insert a .030" feeler
gauge between the core pin and the armature. Hold
the armature closed against the core pin and gauge
and adjust the stationary contacts such that they just
make with the moving contact. Both stationary con-
tacts should make at approximately the same time.
The contact follow will be approximately 1/64" to
3/64".
10.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.
Sub 3
3516A14
Figure 2:
Block Diagram of the Type SSC-T Relay in the
Type FT-11 Case
SSV-T and SSC-T High Drop-out Relay
Sub 1
3516A15
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