The Liebert AC4 is ideal for coordinated control of systems with redundant equipment, such as
multiple environmental units or pumps. When the Liebert AC4 controller detects an alarm in an
operating device, the Liebert AC4 enables a standby device and controls the device in alarm as
configured, either leaving that device operating or disabling it.
The Liebert AC4 controller can also balance usage of devices by rotating units through Operating and
Standby modes according to a user-defined schedule. This helps keep redundant equipment operating
efficiently and only when needed. The Liebert AC4 can perform routine testing of standby devices and
alert personnel if a standby device fails an operating test and requires attention.
Another capability of the Liebert AC4 is monitoring the status of connected devices and keeping
personnel apprised through local alarming.
The Liebert AC4 controller can interface with anything that closes an electrical contact. To improve
process efficiency and troubleshooting, the controller tracks data in two types of logs: alarm and
event. The Liebert AC4 has a local LCD interface and an RS232 interface.
When an alarm condition arises, the Liebert AC4 displays alarm information, sounds an audible
alarm, changes the state of the common alarm relay and turns connected devices on or off according to
user configuration. See 1.5 Typical Configuration for a more detailed example.
1.1Methods of Viewing and Configuring the Liebert AC4
Introduction
The Liebert AC4 features access through two interfaces that allow users to configure the unit, silence
alarms, back up logs, and perform many other functions to keep a large or small operation running
smoothly and safely.
• LCD—liquid crystal display on the front of the panel
• Service Terminal Interface—accessible via a computer connected directly to an RS232 port
These interfaces permit easy access and configuration of the Liebert AC4, allowing users to view data,
silence alarms and have full access to information stored in the controller, including logs of alarms
and events.
1.2Data Logs
The two types of data logs—alarm history and event history—can be viewed on the LCD on the front
of the Liebert AC4 or the Service Terminal Interface. The logs may also be downloaded to a computer
through the Service Terminal Interface.
1.3Available Alarms
The alarms available with the Liebert AC4 are:
• Discrete input alarm (for each digital input)
• Loss of power
• No standby available
• Standby device failed
• No restart available
®
1Liebert
AC4
™
1.4Outside Enclosure Overview
LCD for configuration
and operation
Key lock
The enclosure
has knockouts
and access slots
on top and
bottom for
cables and wires.
Back of LCD
Controller Board
Ground wire
for LCD
Knockouts and
access slots
(top and bottom)
The Liebert AC4 controller board comes in an enclosure that is 2-3/4" deep and has a built-in liquid
crystal display (LCD) and a key lock, as shown in Figure 1. The enclosure is made of metal to
accommodate secure conduit fittings and protect components against environmental debris.
Figure 1Liebert AC4 enclosure—external features
Introduction
The enclosure must be secured to a wall, either flush-mounted or recessed in the wall, as described in
2.0 Installation. Knockouts and access slots on the top and bottom allow easy connection of wires
and cables (see 3.0 Wiring and Connections) with either mounting type.
Figure 2Liebert AC4 enclosure—internal features
Liebert® AC4
™
2
1.5Typical Configuration
DEVICES CONNECTED
TO INPUTS & OUTPUTS
RS232
Liebert
Challenger
3000
™
Liebert
Himod
™
Liebert
Challenger
3000
Liebert
Himod
Zone 1 Devices
Device 1Device 2
Zone 2 Devices
Device 3Device 4
Figure 3 shows an example of external devices connected to the Liebert AC4 controller board. There
may be up to four devices connected to the four digital inputs and four digital outputs. Remote access
is available through the Service Terminal Interface.
Figure 3Typical Configuration
Introduction
3Liebert
®
AC4
™
1.6Controller Board Overview
G - Digital output
connectors
J - Digital input
connectors
P - 24VAC power
connector
E - Digital output
status LEDs
I - Digital output
loss-of-power
jumper
F - Manual
Override Switch
(outputs)
H - Status LEDs
A - Power
On/Off switch
N - LCD
connector
K - Digital input
status LEDs
O - LCD
contrast
adjustment
M - DIP
switch 1
D - Common Alarm
connectors
C - Audible horn
jumper
B - Audible
horn
L - Serial interface
connector
(RS232/EIA574)
The Liebert AC4 controller board has connectors for four digital inputs and four digital outputs, as
shown below. The board comes complete with light emitting diodes (LEDs) to display the status of
connected devices, a serial communications port, a power connection and other features necessary to
control your operation.
Introduction
Table 1Controller board components
A - Power On/Off
switch
B - Audible hornProvides audible notification when an alarm occurs.N/A
C - Audible horn
jumper
D - Common Alarm
connectors
E - Digital output
status LEDs
F - Manual Override
Switch (outputs)
G - Digital output
connectors
H - Status LEDsIndicates the operational status of the controller board.1.7:LED Indicators
Liebert® AC4
ItemDescriptionFor more information, see:
2.4:Connect Power to the Liebert
AC4
N/A
3.0:Wiring and Connections
3.3:Connecting Common Alarm
Outputs
7.4:Setup System - Setup Common
Alarm
1.7:LED Indicators
7.9:Override Output
3.0:Wiring and Connections
3.2.2: Connecting Digital Outputs
5.5:View Output Status
7.6:Setup System - Setup Outputs
™
Power switch for the controller board.
Jumper to disable the audible horn (factory default is
enabled).
The two common alarm connections are used to connect to
a secondary warning device such as a horn, light or
Building Management System (BMS). When an alarm is
present, the contacts close and the external warning device
is activated/notified. The common alarm contacts may be
configured to be reset with the Silence button/command.
Each output has an LED to indicate its status: ON/OFF
(energized/de-energized).
Placing the switch in the ON position will turn ON, or
energize, all four outputs simultaneously. This switch
removes all automatic output control from the Liebert AC4.
Each of the four output connections is a two-state point:
ON/OFF (energized/de-energized).
An example of a field digital output is a Liebert
Environmental unit’s remote shutdown input.
4
Table 1Controller board components (continued)
ItemDescriptionFor more information, see:
One of four output jumpers. Each digital output has a
jumper to set the fail-safe position of the output point when
I - Digital output
loss-of-power
jumper
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 Liebert AC4 has power.
Each of the four input connections is a two-state point:
J - Digital input
connectors
ON/OFF (energized/de-energized).
An example of a field digital input is a Liebert
Environmental unit’s common alarm relay output.
K - Digital input
status LEDs
L - Serial interface
connector
(RS232/EIA574)
Each input has an LED to indicate its status: ON/OFF
(energized/de-energized).
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).
M - DIP switch 1DIP switch used for resetting password to default.7.7.1: Change Password
N - LCD connectorConnection for the LCD on the enclosure door.N/A
O - LCD contrast
adjustment
P - 24VAC power
connector
Adjustment contrast for the LCD on the enclosure door.N/A
Power connection for the controller. Requires 24VAC.
3.2.3: Setting the Digital Output
Jumpers
7.6.4: Configure Output for Loss of
Power (“Fail-Safe”)
3.0:Wiring and Connections
3.2.1: Connecting Digital Inputs
5.4:View Input Status
7.3:Setup System - Setup Inputs
1.7:LED Indicators
3.4:RS232 Connector
A.2: Connecting to the Service
Terminal Interface
2.4:Connect Power to the Liebert
AC4
Introduction
®
5Liebert
AC4
™
1.7LED Indicators
Output LEDs
Status LEDs
Input LEDs
The Liebert AC4 controller board has LED indicators that show the status of inputs, outputs and the
common alarm
Table 2LED indicators summary
LED TypeLEDColorDescription
EIA422
LEDs
Output LEDs
Status LEDs
Input LEDs
422 TXGreenLiebert AC4 is transmitting information over the EIA422 port
422 RXGreenLiebert AC4 is receiving information over the EIA422 port
OUTPUT1GreenNot used
OUTPUT2GreenNot used
OUTPUT3GreenNot used
OUTPUT4GreenNot used
OUTPUT5GreenIndicates output 1 is ON or energized
OUTPUT6GreenIndicates output 2 is ON or energized
OUTPUT7GreenIndicates output 3 is ON or energized
OUTPUT8GreenIndicates output 4 is ON or energized
CTRLLOCKN/ANot used
SENLOCKN/ANot used
CMN ALRGreenIndicates output is ON or energized
MOPGreen
Indicates the microprocessor is operating properly (MOP)—must be on before
Liebert AC4 will function
FPROGGreenIndicates firmware is being upgraded—lights up during upgrade process
574 TX or 232 TXGreenLiebert AC4 is transmitting information via the RS232 port
574 RX or 232 RXGreenLiebert AC4 is receiving information via the RS232 port
485 RXGreenNot used
485 TXGreenNot used
INPUT1RedNot used
INPUT2RedNot used
INPUT3RedNot used
INPUT4RedNot used
INPUT5RedIndicates input 1 is ON or energized
INPUT6RedIndicates input 2 is ON or energized
INPUT7RedIndicates input 3 is ON or energized
INPUT8RedIndicates input 4 is ON or energized
OUTPUT1
DS56
OUTPUT2
DS54
OUTPUT3
DS63
OUTPUT4
DS61
OUTPUT5
DS60
OUTPUT6
DS62
OUTPUT7
DS55
OUTPUT8
DS57
CTRLLOCK
DS59
SENLOCK
DS58
CMN ALR
DS53
DS52
MOP
F PROG
DS51
574 TX
DS48
574 RX
DS47
485 RX
DS78
485 TX
DS79
DS69
INPUT1
INPUT2
DS71
INPUT3
DS72
INPUT4
DS70
INPUT5
DS67
INPUT6
DS66
INPUT7
DS65
INPUT8
DS64
Introduction
Liebert® AC4
™
6
1.8Typical Sequence
ALARMS CLEARED
30-SEP-04 16:24:04
Entry in Alarm Log
(
ALARMS CLEARED)
DEVICE_1 ALARM
CONTACT CLOSED
30-SEP-04 16:23:04
Entry in Alarm Log
Condition (
ALARM)
& state (
CONTACT CLOSED)
The alarm is cleared
(automatically if Unlatched; must be
cleared manually if Latched)
UNIVERSAL MONITOR
05-SEP-02 14:04:13
V5.100.0
PRESS =STATUS/SETUP
ESCESC
The LCD stops flashing
RETURN TO NORMAL
The device that triggered the alarm
returns to its normal state.
The horn sounds (audible horn on
the controller board—silence horn by
pressing any key on the LCD keypad)
The LCD flashes
(except during setup)
ALARM CONDITION DETECTED
A device connected to the Liebert
AC4 changes state.
RESPONSES TO AN ALARMRETURN-TO-NORMAL SEQUENCE
ESC
DEVICE_1 STARTED
DEVICE_2 STARTED
DEVICE_3 STARTED
DEVICE_4 OFF
30-SEP-04 16:24:06
DEVICE_4 STARTED
30-SEP-04 16:23:10
DEVICE_1 ALARM
CONTACT CLOSED
Entry in Event Log
Status change
(
DEVICE_4 STARTED)
Entry in Event Log
Actions in response to event
(DEVICE_1 STARTED,
DEVICE_4 OFF
)
Entry in Active Alarm Log
Condition (
ALARM)
& state (
CONTACT CLOSED)
The horn stops sounding
(if user hasn’t silenced it)
User setup determines output
control (for example, the device
in alarm might be disabled and a
standby device set to operate)
Figure 4 shows a typical sequence of how the Liebert AC4 functions after detecting a change in a
monitored device. Many responses depend on configuration settings. This example shows what
happens when a digital input changes state—assuming the input is defined as alarmable—and when
the condition returns to normal.
Figure 4Example of typical sequence
Introduction
UNIVERSAL MONITOR
05-SEP-02 14:04:13
V5.100.0
PRESS =STATUS/SETUP
ESC
7Liebert
®
AC4
™
2.0INSTALLATION
2.1Installation Considerations
The Liebert AC4 must be installed indoors and may be mounted on the surface of a wall or flushmounted, depending on the user’s application, the location of equipment to be connected and the type
of wall the unit will be mounted on.
The Liebert AC4 should be mounted where it can be easily accessed. On-site personnel would access
the unit through the LCD on its front cover or the service terminal connected to the RS232 port.
In addition to the communications connections, the site also must have electrical service and must
permit connecting the unit’s four digital inputs and four digital outputs.
The wall material must be capable of supporting the weight of the Liebert AC4: see
8.0 Specifications.
NOTE
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is
likely to cause harmful interference in which case the user will be required to correct the
interference at his own expense.
Installation
2.1.1 Unpacking and Preliminary Inspection
• Before unpacking the Liebert AC4, inspect the shipping carton for damage or signs of
mishandling, such as gashes or holes in the carton or severely flattened corners.
• Open the shipping crates carefully. Use care to avoid puncturing the container with sharp objects
that might damage the contents.
• Inspect the Liebert AC4 and all included components for damage.
• If any damage from shipping or mishandling is observed, immediately file a damage claim with
the shipping agency and forward a copy to:
Removing the conduit knockouts before mounting the Liebert AC4 on the wall will ease
installation and prevent strain on the mounting hardware and wall. It is imperative to remove
the knockouts if the unit is to be flush-mounted.
After determining where to place the unit, check to ensure that you have all the hardware required to
install the panel on the surface of a wall. Obtain the needed tools and material.
Required tools
• Electric drill (if surface is too hard to drive screws without pilot holes)
• Screwdriver
• Marker to denote layout of holes
• Four screws, each #10
2.2.1Mounting the Panel
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Check building plans and other relevant documents to determine whether mounting the
Liebert AC4 at the selected location might cause cutting or otherwise damaging electrical or
communication wiring or pipes.
Installation
1. Mark the wall for mounting holes, using the back of the unit as a template (see Figure 5).
2. Drill holes, if required, to install the four #10 screws that will secure the Liebert AC4 to the wall.
Clean up the debris.
3. If the wall material is not strong enough to hold the screws securely, use wall anchors.
4. Install the top two screws—the screw heads must be small enough to slip through the larger,
bottom portion of the pear-shaped mounting slot in the Liebert AC4 (see inset in Figure 5). The
screws must also be large enough to extend over the edges of the top of the mounting slot.
5. Hang the Liebert AC4 on the screws, letting the panel slip down until the screws are in the
smaller, upper portion of the slot.
6. Tighten the screws until they are snug.
7. Insert the remaining two screws in the bottom holes on the back of the panel and tighten.
Figure 5Mounting dimensions
9Liebert
®
AC4
™
2.3Flush-Mounting the Liebert AC4
!
NOTE
Removing the conduit knockouts before mounting the Liebert AC4 on the wall will ease
installation and prevent strain on the mounting hardware and wall. It is imperative to remove
the knockouts if the unit is to be flush-mounted.
The rectangular access doors on the top and bottom of the Liebert AC4 must be reversed so they
slide the opposite direction. Leaving the doors as shipped from the factory prevents them from
being opened when the panel is flush mounted in a wall.
The Liebert AC4 may be flush mounted according to company practices—either with screws through
the sides of the panel into wall supports or with hanging hardware that attaches to the back of the
panel. After determining how and where to place the unit, check to ensure that you have all the
hardware required to install the panel in the wall. Obtain the needed tools.
Required tools
•Saw
• Electric drill
• Screwdriver
• Marker to denote layout of the hole to accommodate the Liebert AC4
• Trim ring and associated hardware
• Mounting hardware
Installation
2.3.1Mounting the Panel
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Check building plans and other relevant documents to determine whether mounting the
Liebert AC4 at the selected location might cause cutting or otherwise damaging electrical or
communication wiring or pipes.
1. Mark the wall for the cutout to accommodate the panel, using the back of the unit as a template.
2. Drill a pilot hole for the saw blade, if required.
3. Use the saw to cut out the marked section of the wall (if not new construction).
4. Rest the Liebert AC4 in the wall and mark where mounting screws will be inserted into the wall
studs or other support member.
5. Remove the panel and drill the holes for the mounting screws or wall anchors. Clean up the
debris.
6. Reverse the slide direction of the rectangular access doors on the top and bottom of the Liebert
AC4. Leaving the doors as shipped from the factory prevents them from being opened when the
panel is flush mounted in a wall.
7. Attach any field-supplied mounting hardware.
8. Reinsert the assembly into the wall.
9. Insert and tighten the screws or wall anchors.
Liebert® AC4
™
10
2.4Connect Power to the Liebert AC4
!
!
!
24VAC input
connector
24VAC wiring
(red & white)
Power
On/Off
switch
External wiring
through knockout
Earth ground
terminal
Ground wire
(black)
The Liebert AC4 requires 24VAC for proper operation. Liebert recommends using the optional
Transformer Module manufactured by Liebert or another UL-approved class 2 power unit to obtain
proper voltage. If the power unit is not a class 2 circuit, it must be protected with an IEC 5 x 20mm
time lag 2A fuse. For information, consult your local dealer, Emerson representative or the Emerson
Network Power Liebert Worldwide Support Group.
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Check that power is removed from wires prior to installation. This unit should be installed
only by properly trained and qualified personnel.
CAUTION
Risk of electric shock. Can cause property damage, injury and death.
The Liebert AC4 is designed for use on properly grounded (earthed) 24VAC power, 50Hz or
60Hz. The ground wire for the power lead must be wired to the earth ground terminal (stud
located next to the 24VAC terminal block).
This equipment is intended to be installed by a qualified and certified electrician who must
review and approve customer supplied wiring and circuit breakers, verify correct input and
grounded (earthed) connections to ensure compliance with technical standards and national
and local electrical codes.
Installation
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Be sure that the Power On/Off switch is set to OFF before installing any wiring to this unit.
The switch is in the top left corner of the unit, just below the battery pack.
To connect electrical power:
1. Run conduit and electrical wiring from building to the Liebert AC4.
2. Use copper wires only; proper wiring to use for power is 18-22 AWG stranded and shielded
(18 AWG is recommended—see Table 4). Strip wires 1/2".
Figure 6Electrical connections to panel
3. Secure the incoming electrical service wires to the Liebert AC4’s 24VAC input by sliding the wires
into TB7, the 24VAC input terminal block. There is no polarity requirement when connecting to
TB7. The ground wire must be connected to the earth ground terminal located on the side of the
panel (see Figure 6).
11Liebert® AC4
™
Wiring and Connections
!
3.0WIRINGAND CONNECTIONS
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Switch Off electric power to the Liebert AC4 before installing any wiring to the unit or
changing input or output connections. The Power On/Off switch is in the top left corner of the
unit.
3.1Wiring Specifications
Input and output connections to the Liebert AC4 may be made in any order—it is not necessary, for
example, to make all input connections before making any output connections. Use copper conductors
only for all wiring.
@3A 50 ft. (15m)
@2A 100 ft. (30m)
@1A 200 ft. (60m)
18 AWG*
(recommended)
@3A 50 ft. (15m)
@2A 100 ft. (30m)
@1A 200 ft. (60m)
750 ft. (225m)
20 AWG22 AWG
@3A 40 ft. (12m)
@2A 60 ft. (18m)
@1A 100 ft. (30m)
20 AWG22 AWG
@3A 40 ft. (12m)
@2A 60 ft. (18m)
@1A 100 ft. (30m)
150 ft. (45m)24VAC @1.3A
@3A 25 ft. (7m)
@2A 35 ft. (10m)
@1A 75 ft. (23m)
@3A 25 ft. (7m)
@2A 35 ft. (10m)
@1A 75 ft. (23m)
Dry Contact
(24VDC, 10 mA)
24VAC @3A
24VAC @3A
Liebert® AC4
™
12
3.2Connecting Digital Inputs and Outputs
INPUT TERMINAL
BLOCKS
Note numbering keys
to right of terminal
blocks; inputs are
numbered from
bottom (1) to top (4)
OUTPUT TERMINAL
BLOCKS
Note numbering keys
to right of terminal
blocks; outputs are
numbered from
bottom (1) to top (4)
Numbering
keys
The digital inputs and outputs are on the lower right side of the Liebert AC4 printed wiring assembly
board. This section describes how to connect devices to the Liebert AC4’s inputs and outputs.
Each input is tied to an output with the same number:
• Input 1 is tied to Output 1 (default name: Device_1)
• Input 2 is tied to Output 2 (default name: Device_2)
• Input 3 is tied to Output 3 (default name: Device_3)
• Input 4 is tied to Output 4 (default name: Device_4)
Up to four devices may be connected to the Liebert AC4. Each device must be connected to an input
and an output with the same number.
To determine the proper wire size, see Table 4 Wiring specifications.
NOTE
Each terminal block is a removable assembly to permit easier connection of more than one
input or output at a time. If making multiple connections, grasp the upper portion of a block
and pull firmly until the assembly pulls apart.
After making the connections, push the removed piece back into the portion attached to the
printed wiring assembly until the terminal block pieces lock together.
Connecting Liebert Precision Cooling Units
Wiring and Connections
For Liebert Precision Cooling units, follow these steps (be sure to connect the same device to inputs
and outputs with the same number (Input 1 and Output 1, Input 2 and Output 2, and so on):
• Connect a digital input from the Liebert AC4 to the Common Alarm Relay of the environmental
unit: terminals 75/76 or TB1-6,TB1-7.
• Connect a digital output (numbered the same as the input) from the Liebert AC4 to the Remote
Shutdown (Power Control) of the environmental unit: terminal 37/38 or TB1-4, TB1-5.
3.2.1Connecting Digital Inputs
The four digital inputs are on the lower right side of the
Liebert AC4, just below the output terminal blocks, as
shown at right. These inputs are numbered 1 through 4.
To connect an input:
1. Turn Off electrical power to the Liebert AC4.
2. If necessary, remove a conduit knockout to permit wire
entry into the Liebert AC4 enclosure.
3. Bring the wire(s) into the Liebert AC4 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.
13Liebert® AC4
™
3.2.2Connecting Digital Outputs
!
Digital output jumpers (four)
The four digital outputs are found on the lower right side of the Liebert AC4 just above the input
terminal blocks, as shown at right. These outputs are numbered 1 through 4.
To connect an output:
1. Turn OFF electrical power to the Liebert AC4.
2. If necessary, remove a conduit knockout to permit wire entry into the Liebert AC4 enclosure.
3. Bring the wire(s) into the Liebert AC4 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.
CAUTION
To reduce the risk of fire or electric shock, do not interconnect the outputs of different class 2
circuits.
3.2.3Setting the Digital Output Jumpers
Each digital output has an associated jumper to define its
operation when power is interrupted. This puts the
Liebert AC4 in a fail-safe mode and ensures proper
functioning when the board has no power.
The Liebert AC4 comes from the factory with all digital
output jumpers in the OFF position (normally open). The
jumper setting for each digital output can be changed to
ON (normally closed). The settings are shown in Table 5.
Table 5Digital output jumper settings
Setting
OFFNormally open
ONNormally closed
Output status
(power loss)
Wiring and Connections
To change the output jumper setting:
1. Find the respective loss-of-power jumper on the
circuit board, as shown above. See Table 1 Controller board components for more
information.
2. Decide whether your configuration requires the jumper to be OFF or ON.
3. Set the jumper as needed:
• Set the jumper to OFF by placing the loss-of-power jumper on the middle and top pins.
• Set the jumper to ON by placing the black jumper on the middle and bottom pins.
Liebert® AC4
™
14
3.3Connecting Common Alarm Outputs
Common alarm outputs
Serial
interface
connector
(RS232/EIA5
74)
The common alarm relay, found in the top right corner of the
Liebert AC4, permits the user to connect auxiliary notification
equipment, such as lights, horns and sirens, to the Liebert AC4.
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 Liebert AC4.
2. If necessary, remove a conduit knockout to permit wire entry into the Liebert AC4 enclosure.
3. Bring the wire(s) into the Liebert AC4 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.
3.4RS232 Connector
The Liebert AC4’s Service Terminal Interface offers
full configuration and monitoring capability via the
RS232 port (see A.2 - Connecting to the Service Terminal Interface).
The RS232 port requires a null modem cable. Connect
one end of the cable to the Liebert AC4’s RS232 port,
shown at right, and the other end to the COM1 port of
a laptop computer or video terminal.
Wiring and Connections
15Liebert® AC4
™
Overview of Menus
4.0OVERVIEWOF MENUS
There are two ways to access the Liebert AC4: the LCD on the front of the enclosure and the Service
Terminal Interface, which is accessible through any computer using a communications program.
Many viewing and configuration tasks can be performed through either interface, but some are
available only through the Service Terminal Interface.
• Step-by-step instructions for all functions appear in Sections 5.0 through 7.0. These instructions
use examples of LCD screens to illustrate most functions, except those not available via the LCD.
• Examples of all Service Terminal Interface screens appear in Appendix A - Service Terminal
Interface, along with instructions on how to connect to the Service Terminal Interface.
Table 6 lists all Liebert AC4 functions and shows whether they can be performed through the LCD
interface and where to find information.
Table 6Guide to Liebert AC4 functions
Can be performed via:Where to find:
Function
VIEW STATUS FUNCTIONS
View Active Alarms44 page 19page 57
View Alarm Log44 page 20page 58
View Event Log44 page 21page 59
View Input Status44 page 22page 59
View Output Status44 page 23page 60
SILENCE ALARM & BACK UP LOGS FUNCTIONS
Silence Alarm
(On the LCD, press any key to silence an alarm)
Back Up Log Files—4page 25page 62
SYSTEM & CONTROL FUNCTIONS
Login44 page 27page 63
Setup System44 page 29page 64
Setup Inputs44 page 29page 65
Setup Common Alarm44 page 32page 66
Setup Zones44 page 33page 66
Setup Outputs44 page 34page 67
Setup System Info44 page 36page 68
Change Password 44 page 36page 68
Set Date & Time/Automatic Daylight Saving Time44 page 37page 69
Setup Site ID 44 page 37page 69
Backup and Upload Configuration File—4page 38page 70
Factory Defaults 44 page 41page 71
Perform Firmware Update—4page 41page 72
Setup Operation44 page 43page 73
Override Output44 page 47page 76
Clear Alarms & Logs44 page 48page 77
Clear Active Alarms44 page 48page 77
Clear the Alarm Log 44 page 48page 77
Clear the Event Log 44 page 48page 78
LCD
44 page 24page 61
Service
Terminal
Instructions on
using function
Service Terminal
screen examples
Liebert® AC4
™
16
4.1Opening Screen Overview
Opening Screen
LIEBERT AC4
DD-MON-YY HR:MM:SS
VX.XXX.X
PRESS
↵=STATUS/SETUP
(If any alarms detected)
Current Alarm screen
(see 5.1 View Active Alarms)
Main Menu
VIEW STATUS
SYSTEM AND CONTROL
↑↓=NEXT
↵=SELECT
“View Status” selected
See Section
“System & Control” selected
See Section
> VIEW STATUS
SYSTEM AND CONTROL
↑↓=NEXT
↵=SELECT
5.0
VIEW STATUS
> SYSTEM AND CONTROL
↑↓=NEXT
↵=SELECT
7.0
View Status Menu
(All users - no password)
See Section
System & Control Menu
(Password required)
See Section
VIEW ACTIVE ALARMS
VIEW ALARM LOG
VIEW EVENT LOG
VIEW INPUT STATUS
VIEW OUTPUT STATUS
5.1
5.2
5.3
5.4
5.5
SETUP SYSTEM
OVERRIDE OUTPUT
CLEAR ALARMS & LOGS
7.2
7.9
7.10
The Liebert AC4 displays the Opening Screen at startup, as shown in Figure 7.
• If any alarms are active, the Current Alarm screen appears. (Pressing any key on the LCD keypad
will silence the audible alarm.)
If no alarms are present, the Main Menu appears.
4.2Main Menu Overview
The Main Menu offers access to all functions within the panel. As shown in Table 7, the functions are
organized into three sections with step-by-step instructions.
Table 7Primary Functions Overview
SectionDescription
These features are available to all users. This permits all personnel to check the
5.0 - View Status Options
(both LCD and Service
Terminal Interface)
6.0 - Silence Alarm & Backup
Log Files (Service
Terminal Interface only)
7.0 - System and Control
Options (some functions
available via Service
Terminal Interface only)
status of any monitored equipment or location. From this menu, any user may:
• View active alarms
• View the current status of digital inputs and outputs
• View data stored in the alarm and event logs
These features—available via the Service Terminal Interface only—allow users to:
• Silence the audible alarm
• Back up the alarm and event logs
These options require a password. Authorized users may:
• Configure the Liebert AC4
• Override automatic control of outputs to force an output ON or OFF
• Clear active alarms and delete all records in the alarm and event logs
Overview of Menus
4.3LCD Menu Overview
Figure 7 shows an overview of the initial screens available through the LCD interface. For
comparable information about the Service Terminal Interface screens, see A.3 - Overview of Menus.
Figure 7LCD Menu overview
17Liebert® AC4
™
5.0VIEW STATUS OPTIONS
Opening Screen
LIEBERT AC4
DD-MON-YY HR:MM:SS
VX.XXX.X
PRESS ↵=STATUS/SETUP
Main Menu
> VIEW STATUS
SYSTEM AND CONTROL
↑↓=NEXT↵=SELECT
View Status
VIEW ACTIVE ALARMS
VIEW ALARM LOG
VIEW EVENT LOG
VIEW INPUT STATUS
VIEW OUTPUT STATUS
View Active AlarmsView Alarm LogView Event Log
> ACTIVE ALARM 40/40
DEVICE_1 ALARM
CONTACT CLOSED
See
Section
5.1
> ALARM RECORD 99/99
DEVICE_1 ALARM
CONTACT CLOSED
30-JUN-04 09:29:10
NO STANDBY AVAILABLE
29-JUN-04 10:45:00
STNDBY DEVICE FAILED
29-JUN-04 10:39:00
NO RESTART AVAILABLE
28-JUN-04 06:54:09
See
Section
5.2
> EVENT RECORD 99/99
SYSTEM
USER LOGIN
19-MAY-04 10:07:00
DEVICE_1 HW FORCE ON
CONTACT CLOSED
18-MAY-04 06:47:03
DEVICE_4 FORCE OFF
CONTACT OPEN
18-MAY-04 05:22:17
For ease of understanding, this section uses the LCD interface to illustrate most instructions,
except for features that are available only through the Service Terminal Interface. All Service
Terminal Interface screens appear in Appendix A - Service Terminal Interface.
The View Status menu allows any user to view currently active alarms, data stored in the alarm and
event logs and the status of all inputs and outputs. The arrows
menu. The Enter ↵ key is used to select the menu item.
This section presents step-by-step instructions for each of the following options:
• View Active Alarms
•View Alarm Log
•View Event Log
• View Input Status
• View Output Status
Figure 8 shows the main options available from the View Status menu.
Figure 8Menu overview - View Status menu
View Status Options
↑↓ are used to scroll through the
Liebert® AC4
™
18
5.1View Active Alarms
Main Menu
> VIEW STATUS
SYSTEM AND CONTROL
↑↓=NEXT
↵=SELECT
View Status Menu
> VIEW ACTIVE ALARMS
VIEW ALARM LOG
VIEW EVENT LOG
VIEW INPUT STATUS
VIEW OUTPUT STATUS
Active Alarms
> ACTIVE ALARM 01/40
DEVICE_1 ALARM
CONTACT CLOSED
The Active Alarm screen displays all alarms that are occurring, up to a
maximum of 40.
A Current Alarm screen appears automatically whenever an alarm
occurs—except during setup. This screen can display only the two most
recent active alarms. To view any other active alarms, use the View
Active Alarms feature.
You may view active alarms at any time by using the following steps:
View Status Options
• From the Main Menu, use the arrows
shown at right, and then press Enter ↵.
• From the View Status Menu, use the arrows
Active Alarms and press Enter ↵.
5.1.1Active Alarms
The Active Alarms screen displays up to 40 records; it shows any active
alarm and any Latched alarm that has not been cleared. Examples of
alarms include inputs in alarm status and failure of a standby device. When any alarms are present,
the Active Alarms screen shows descriptive details for each alarm:
• the source of the alarm (for example,
• the status of an input (
If there are no active alarms, the screen displays the message:
NO ALARMS PRESENT
Viewing Additional Screens
There may be up to 40 records of alarm data.
• To view additional records, use the arrows
• To return to the previous screen, press the ESC key.
Clearing Active Alarms
To clear all active alarms, see 7.10 Clear Alarms & Logs. Alarm records are stored in the Alarm Log.
↑↓ tochoose View Status, as
↑↓ tochoose View
DEVICE_1)
CONTACT CLOSED)
↑↓.
19Liebert® AC4
™
5.2View Alarm Log
Main Menu
> VIEW STATUS
SYSTEM AND CONTROL
↑↓=NEXT
↵=SELECT
View Status Menu
VIEW ACTIVE ALARMS
> VIEW ALARM LOG
VIEW EVENT LOG
VIEW INPUT STATUS
VIEW OUTPUT STATUS
Alarm Log
> ALARM RECORD 99/99
DEVICE_1 ALARM
CONTACT CLOSED
30-JUN-04 09:29:10
NO STANDBY AVAILABLE
29-JUN-04 10:45:00
STNDBY DEVICE FAILED
29-JUN-04 10:39:00
NO RESTART AVAILABLE
28-JUN-04 06:54:09
The Alarm Log contains up to 99 records of alarms that have occurred.
Records are added to this log as alarms occur.
To view the Alarm Log:
View Status Options
• From the Main Menu, use the arrows
then press Enter ↵.
• From the View Status Menu, use the arrows
Alarm Log, then press Enter ↵.
5.2.1Alarm Log
The Alarm Log screen displays up to 99 records showing alarm data,
including inputs and outputs in alarm status and failure of a standby
device. If the log contains any alarm records, the Alarm Log screen
displays details for each alarm:
• the source of the alarm (for example,
• the status of an input or output (
description of the problem (
• the date and time the alarm occurred
Table 8 shows conditions that the alarm log records for digital inputs
and in the panel itself.
Table 8Alarm log conditions
SOURCE
CONDITIONS
RECORDED
↑↓ tochoose View Status,
DEVICE_1)
CONTACT CLOSED) or a brief
STNDBY DEVICE FAILED)
Digital InputPanel
LOSS OF POWER
ALARM
NORMAL
ALARM SILENCED
ALARMS CLEARED
STNDBY DEVICE FAILED
NO STANDBY AVAILABLE
NO RESTART AVAILABLE
↑↓ tochoose View
If there are no alarms in the log, the screen displays the message:
Viewing Additional Screens
5.2.2Backing Up the Alarm Log (Service Terminal Interface only)
There may be up to 99 records of alarm data.
• To view additional records, use the arrows
• To return to the previous screen, press the ESC key.
The alarm log is stored as a file in the Liebert AC4; it can hold no more than 99 records. When the log
is full, the oldest records are deleted from the end of the file as new alarm records are added at the
beginning.
You may back up the alarm log file to a remote computer using the Service Terminal Interface, as
described in 6.2 Back Up Log Files (Service Terminal Interface only).
To delete all records in the alarm log, see 7.10 Clear Alarms & Logs.
NO ALARMS
↑↓.
Liebert® AC4
™
20
5.3View Event Log
Main Menu
> VIEW STATUS
SYSTEM AND CONTROL
↑↓=NEXT
↵=SELECT
View Status Menu
VIEW ACTIVE ALARMS
VIEW ALARM LOG
> VIEW EVENT LOG
VIEW INPUT STATUS
VIEW OUTPUT STATUS
Event Log
> EVENT RECORD 99/99
SYSTEM
USER LOGIN
19-MAY-04 10:07:00
DEVICE_1 HW FORCE ON
CONTACT CLOSED
18-MAY-04 06:47:03
DEVICE_4 FORCE OFF
CONTACT OPEN
18-MAY-04 05:22:17
DEVICE_3 AUTO
CONTACT OPEN
18-MAY-04 04:32:11
DATE AND TIME SET
18-MAY-04 03:11:43
DEVICE_4 FORCE ON
CONTACT CLOSED
18-MAY-04 02:34:00
In addition to alarms, the Liebert AC4 tracks other changes in the
Event Log to assist users with verifying operational and
troubleshooting problems. Events reflect changes in the status of an
input that is defined as an event or the change of state of an output (i.e.,
manually forced ON or OFF). Other events may be informational, such
as a user login. The Event Log contains up to 99 records of events,
which are added as they occur.
To view the Event Log:
View Status Options
5.3.1Event Log
• From the Main Menu, use the arrows
↑↓ tochoose View Status,
then press Enter ↵.
• From the View Status Menu, use the arrows
↑↓ tochoose View
Event Log, then press Enter ↵.
The Event Log screen displays up to 99 recent events. If the log
contains any event records, the Event Log screen displays details for
each event:
• the event source (for example,
• the status of an input or output (
description of the event (
DEVICE_1)
CONTACT CLOSED) or a brief
USER LOGIN)
• the date and time the event occurred
Table 9 shows conditions that the event log records for inputs and
outputs and in the panel itself.
Table 9Event log conditions
SOURCE
CONDITIONS
RECORDED
Digital InputDigital OutputPanel
ALARMS CLEARED
ALARM SILENCED
NO STANDBY OUTPUTS
AVAILABLE
NO STANDBY TESTING
DEVICE AVAILABLE
TIME & DATE SET
USER LOGIN
EVENT
NORMAL
STARTED
ON
OFF
HW FORCE ON
AUTO
FORCE ON
FORCE OFF
RESTORED
If there are no records in the log, the screen displays the message:
Viewing Additional Screens
There may be up to 99 records of event data.
• To view additional records, use the arrows
5.3.2Backing Up the Event Log (Service Terminal Interface only)
• To return to the previous screen, press the ESC key.
The event log is stored as a file in the Liebert AC4; it can hold no more than 99 records. When the log
is full, the oldest records are deleted from the end of the file as new event records are added at the
beginning.
You may back up the event log file to a remote computer using the Service Terminal Interface, as
described in 6.2 Back Up Log Files (Service Terminal Interface only).
To delete all records in the event log, see 7.10 Clear Alarms & Logs.
NO EVENTS
↑↓.
21Liebert® AC4
™
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