Tadiran Telecom Coral IPx Office, Installation And Hardware Reference Manual, Page: 415 / 510

Coral IPx Office Installation Manual Shared Service Cards
9-103
Relay Contacts
RL
Y1, RL
Y2, RL
Y3
9
9.17
Relay Contacts
RLY1, RLY2, RLY3
0
The U-RMI Office , U-MR Office, RMI Office and MR Office cards incorporate two
relay contacts (1-2 and 3-4) for two of the following three features:
„
External voice paging (PAGE). Described
on page 9-79
.
„
Universal Night Answer (UNA) Central Bell. Described
on page 9-87
.
„
Dial operated accessory/alarm (RELAY). Described
on page 9-93
.
The applications described in the sections above describe several examples of the
control of external devices through relay contacts on the
U-RMI Office , U-MR Office,
RMI Office or MR Office cards. A limited description of most of the external devices
is listed herein. In each application, however, several important factors should be
considered.
The relays provide form A (single pole, single throw, normally open, or SPST-NO)
contacts for activating external circuitry and devices. Operation of the relays is
determined by the system database.
„
Contacts RLY1 are designated to operate in conjunction with audio interface
M2/P for external paging applications.
„
Contacts RLY2 are designated as a UNA Bell destination.
„
Contacts RLY3 are also designated for use as either a major or minor system
alarm signal, or an auxiliary dial-operated relay contact.
The relay contacts provided on the U-RMI Office , U-MR Office, RMI Office and
MR Office cards have specific electrical limitations. See
Specifications - Relays
below.
Do not exceed these limitations. In addition, the type of load the relay contact operates
can have a great impact.
Ideally, the contact should operate a low voltage, low current, non-inductive load such
as a light bulb or solid state device. When the voltage or current increases, or when an
inductive load such as a relay coil or solenoid is connected, the likelihood of arching
across the contact increases. Contact arching occurs while the contact is opening and
burns away the precious metal surface, increasing the chance of the contact being
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1 General Information