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Wiring for Radio Faults
You may program the radio fault output relay (refer to Programming the 7835C section) for either:
FAIL-SAFE mode (UL requirement)
•
Answer “Y” to “FLT REL ON (Y/N)”
•
Relay always energized [N.C.]
•
Relay will change state (and trigger a dialer, if
connected) in the event of power loss.
•
Fail-safe mode increases the standby current by about
10mA, which results in lower battery backup time
(about 15%) in the event of power loss.
LOW CURRENT mode
•
Answer “N” to “FLT REL ON (Y/N)”
•
Relay normally de-energized [N.O.]
•
Does not increase standby current
•
NOT approved for UL installations.
Run two wires from the 7835C’s radio fault terminals 11 and 12 to a zone on the control panel. Refer to the
Figures below for wiring the radio fault relay.
CONTROL PANEL
7835C
ZONE INPUT
2K or 3K (TYPICAL)
+
-
TERM. 11
RADIO FAULT RELAY 1
TERM. 12
RADIO FAULT RELAY 2
EOL RESISTOR
CONTROL PANEL
7835C
ZONE INPUT
2K or 3K (TYPICAL)
+
-
TERM. 11
RADIO FAULT RELAY 1
TERM. 12
RADIO FAULT RELAY 2
EOL RESISTOR
Figure 11. Wiring the 7835C to trip a control panel zone
Figure 12. Wiring the 7835C to trip a
during a radio fault (required for UL installations)
control panel zone for normally open fault
(not UL approved)
AC Power Connections
Primary power for the 7835C is provided by a wall-mounted 16.5VAC / 40VA transformer ADEMCO PN:
1361 (1361CN in Canada). Use of a transformer with a lower power rating will result in unreliable system
operation.
Connect the AC power wires from the 16.5V 40VA wall transformer to terminals 1 and 2 on the 7835C. Do
not plug the transformer into the AC power source until all wiring connections have been made and you are
ready to power up the 7835C. Refer to the 7835C Initial Power-Up Sequence section.
Backup Battery Connection
The optional battery backup (ADEMCO 7720BT) can provide over 4 hours of system life in the event of an
AC power failure. When AC power is lost, the 7835C enters a low-power state and the programmable AC
loss message can alert the AlarmNet Control Center (AC loss messages are reported within 10-40 minutes
of actual AC loss). Any alarms that are tripped during this low-power state will wake the system up to
transmit the appropriate message. After a successful transmission, the 7835C will reenter its low-power
state. When the battery reaches 11.5V, a low-battery message is transmitted, which alerts the AlarmNet
Control Center that this may be the radio’s last message. When the battery reaches 8.5V, radio
transmissions are no longer possible and the system shuts down. If AC power is restored before the system
shuts down, an AC Restore message will be sent and the battery will be recharged using the 7835C’s built-
in battery charger. If AC power is restored after the system has shut down, a power-on reset condition
exists, and the radio will initialize itself as described earlier and the battery will be recharged.
The 7835C performs a battery test under load on a daily basis. During this test, if the battery drops below
11.5V, a low-battery message will be generated to indicate that the battery should be replaced.
To install the battery, snap it into the battery holder with the connector wire towards the lower right. Do not
plug the battery in until all wiring connections have been made and you are ready to power up the 7835C.
Refer to 7835C Initial Power-Up Sequence section. When you are ready to power up the radio, plug the
battery connector into the battery jack located on the right-hand side of the 7835C terminal strip.
Lower cover must be in place for the 7835C to enter its lower power state during battery operation.
Содержание AlarmNet 7835C
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