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Introduction
5
J - Digital output
connectors
Each of the eight output connections is a two-state point: ON/OFF
(energized/de-energized).
An example of a field digital output point is an air unit On/Off control
circuit.
3.0: Wiring and Connections
3.2.2: Connecting Digital Outputs
5.6: View Output Status
7.7: Setup System - Setup Outputs
K - Status LEDs Indicates the operational status of the controller board. 1.8: LED Indicators
L - Digital output
loss-of-power
jumper
One of eight output jumpers. Each digital output has a jumper to set the
fail-safe position of the output point when power fails. The OFF position
makes the contact Normally Open (factory default). The ON position
makes the contact Normally Closed.
Note: The jumper position has no effect on the contact when the AC8
has power.
3.2.3: Setting the Digital Output
Jumpers
7.7.5: Configure Output for Loss of
Power (“Fail-Safe”)
M - Digital input
connectors
Each of the eight input connections is a two-state point: ON/OFF
(energized/de-energized).
An example of a field digital input point is a common alarm contact on an
air unit.
3.0: Wiring and Connections
3.2.1: Connecting Digital Inputs
5.5: View Input Status
7.3: Setup System - Setup Inputs
N - Digital input
status LEDs
Each input has an LED to indicate its status: ON/OFF (energized/de-
energized).
1.8: LED Indicators
O - EPOP contact
input
The emergency power operation (EPOP) input connection is a two-state
point: ON/OFF (energized/de-energized).
An example of an EPOP input point is a UPS or a generator.
3.0: Wiring and Connections
3.2.5: Connecting the Emergency
Power Operation (EPOP) Input
P - EPOP jumper
Jumper to enable or disable emergency power operation (EPOP). Factory
default is disabled.
3.2.6: Setting the EPOP Jumper
Q - Analog ground
connector
Connection for an externally powered analog sensor that needs a
reference to ground.
3.3.2: Connecting the Analog Ground
R - Analog input
connectors
Each of the four input connections accepts a 4/20 mA signal.
An example of a field analog input point is a temperature sensor.
3.0: Wiring and Connections
3.3: Connecting Analog Inputs
5.5: View Input Status
7.5: Setup System - Setup Sensor
S - 12VDC/24VDC
analog input jumper
Jumper to select voltage supplied for two-wire analog sensors. The
jumper supplies all four analog input connectors with the same voltage.
Factory default is 24VDC.
3.3.1: Setting the 12VDC/24VDC
Analog Power Jumper
T - SiteScan Web
connector (EIA422)
Connection to monitor AC8 from Liebert’s SiteScan Web graphical
monitoring package.
3.0: Wiring and Connections
3.5: EIA422 SiteScan Web
Connector
U - EIA485 connector Not presently used N/A
V - Serial interface
connector (RS232/
EIA574)
Connection for laptop or video terminal. Used for configuration and
monitoring using the Service Terminal Interface. Requires a null modem
cable for connectivity
(P/N 201258P1).
3.6.1: RS232 Connector
A.2: Connecting to the Service
Terminal Interface
W - Phone line
connector
Connection for phone line. Used for pager notifications, service phone
number, and configuration and monitoring using the Service Terminal
Interface. Requires an RJ11 connector.
3.6.2: Phone Line Connector
7.8: Setup System - Setup Modem &
Pagers
7.9.6: Setup Serv Ph Num - Enter
Phone Number
A.2: Connecting to the Service
Terminal Interface
X - Power receptacle
(Transformer Module)
115VAC power receptacle to power laptop during configuration and
diagnostics. Receptacle not available on 230VAC Transformer Module.
2.4.1: Termination and Mounting
3.0: Wiring and Connections
Y - Power On/Off
switch (Transformer
Module)
Power switch to turn power On/Off to both Transformer Module 24VAC
connectors and power receptacle.
2.4.1: Termination and Mounting
3.0: Wiring and Connections
Z - 24VAC connector
(Transformer Module)
One of the two 24VAC connectors for power (the second is also on the
right side of the Transformer Module near the top). Each connector is
rated for 40VA.
2.4.1: Termination and Mounting
3.0: Wiring and Connections
AA - Modem On-board modem with 9600 baud rate.
7.8: Setup System - Setup Modem &
Pagers
BB - Modem status
LEDs
Indicates the operational status of the modem. 1.8: LED Indicators
CC - DIP switch 1 DIP switch used for resetting password to default. 7.9.1: Change Password
DD - LCD connector Connection for the LCD on the enclosure door. N/A
EE - LCD contrast
adjustment
Adjustment contrast for the LCD on the enclosure door. N/A
FF - Battery pack
connector
Connection for battery pack lead. 2.4.2: Connecting the Battery Pack
GG - 24VAC power
connector
Power connection for the controller. Requires 24VAC. 2.4: Connect Power to the AC8
HH - Transformer
Module
Transformer Module used to convert 115VAC or 230VAC to 24VAC. 2.4.1: Termination and Mounting
Table 1 Controller board components (continued)
Item Description For more information, see: