Emerson Autochangeover Controllers AC8 - Manual (Page 26)

Wiring and Connections
18
3.4 Connecting Common Alarm Outputs
The common alarm relay, found in the top right corner of the
AC8, permits the user to connect auxiliary notification
equipment, such as lights, horns and sirens, to the AC8. To
determine the proper wire size, see Table 4 - Wiring
specifications.
There are two connectors for the common alarm output. However,
the connectors are not individual relay outputs. The connectors
should be treated as a double-pole, double-throw (DPDT) relay.
The common alarm relay is energized whenever an alarm occurs.
To connect an output:
1. Turn OFF electrical power to the AC8.
2. If necessary, remove a conduit knockout to permit wire entry
into the AC8 enclosure.
3. Bring the wire(s) into the AC8 enclosure through a conduit
knockout or access slot.
4. Loosen the appropriate screw and slip the stripped end of the wire into the terminal block.
5. Tighten the screw until it holds the wire snugly.
3.5 EIA422 SiteScan Web Connector
The AC8 will interface with Liebert’s SiteScan Web enterprise monitoring
system. SiteScan can be used to monitor analog and digital equipment from
a host computer and also to perform some configuration.
To connect the SiteScan host computer to the AC8:
1. Turn OFF electrical power to the AC8.
2. If necessary, remove a conduit knockout to permit wire entry into the
AC8 enclosure.
3. Bring the wire(s) into the AC8 enclosure through a conduit knockout or
access slot.
4. Loosen the appropriate screw and slip the stripped end of the wire into
the terminal block.
5. Tighten the screw until it holds the wire snugly.
3.6 Communications Connections
The AC8’s Service Terminal Interface offers full configuration
and monitoring capability via the RS232 port and the phone
line connector (see A.2 - Connecting to the Service
Terminal Interface). The phone line connector is also used
for pager notifications and service phone number options.
3.6.1 RS232 Connector
The RS232 port requires a null modem cable.
• Connect one end of the cable to the AC8’s RS232 port, as
shown at right.
• Connect the other end to the COM1 port of a laptop
computer or video terminal.
3.6.2 Phone Line Connector
The Phone Line Connector requires an RJ11 connector.
• Connect one end of the connector to the AC8’s phone line
connector, shown at right.
• Connect the other end to a telephone wall jack.
TB4:
ONT
ELAY
UTP
OP)
(
TB3, TB4, T
OUTPUT RE
RATINGS: 24
CLASS 2 ON
TB5: COMMON ALARM
RELAY OUTPUTS
BOTTOM
TOP
Q11 2
40
P11
+
C C NO C C NO O
MON ALARM
ENABLE
AUDIBLE
(TOP) NO C NC NO C NC
NC
C
NO
Common alarm outputs
485
+ —
+ —
(TOP)
(BOTTOM)
TB10: COMMS
422
EIA422 SiteScan Web
connector
48
+
+
(TOP)
(BOTTOM)
TB10: COMMS
4
RJ11: PHONE
PIN 3-TIP
PIN 4-RING
MODEM
Serial interface connector
(RS232/EIA574)
Phone line connector