Liebert AC4 User manual

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AC4
Product Specification/Installation Sheet
Description
The Liebert AC4 is ideal for coordinated control of systems with
redundant equipment, such as multiple environmental units or
pumps. When the AC4 controller detects an alarm in an
operating device, the AC4 enables a standby device and controls
the device in alarm as configured, either leaving that device
operating or disabling it.
The 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 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 AC4 is monitoring the
status of connected devices and keeping
personnel apprised through local alarming.
The 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 AC4 has a local LCD
interface and an RS232 interface.
When an alarm condition arises, the 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.
For other applications, contact your local
Liebert representative or call 1-800-222-5877.
Features and Benefits
• Custom configuration for specific applications
• Alarm and Event logs with time and date
stamp
• Backup and download configuration files
• User interface for configuration and
monitoring via local LCD or RS232 port
• On-board audible alarm
• Configuration data and operating program
permanently stored in nonvolatile
Electrically Erasable Programmable Read
Only Memory (EEPROM) for protection
against power loss
• Real-time clock
• Status LEDs for verification and diagnostics
Digital output connectors
Digital input connectors
24VAC power connector Digital output status LEDs
Digital output loss-of-power
jumper
Manual Override Switch
(outputs)
Status LEDs
Power On/Off switch
LCD connector
Digital input status LEDs
LCD contrast
adjustment
DIP switch 1
Common Alarm connectors
Audible horn
jumper
Audible horn
Serial interface connector
(RS232/EIA574)
AC4 Components and Key Features

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Hardware and Components
The AC4 comes standard with an enclosure, a controller board and a liquid crystal display (LCD).
Enclosure
The AC4 enclosure features a key lock for added
security. The enclosure is made of metal to
accommodate secure conduit fittings and
protect components against environmental
debris.
• The enclosure is designed for easy wire
routing and terminations. Access slots for
communication cables and network wires are
located on both the top and bottom of the
enclosure.
• The enclosure is 2-3/4" deep, allowing for
recess mounting in a wall. The enclosure may
also be flush-mounted.
• The enclosure houses the LCD and the
controller board.
Controller Board
The controller board supports a total of 10
points (four digital inputs, four digital outputs
and two Common Alarm outputs).
The digital inputs are dry contacts. The digital
outputs and Common Alarm outputs are
Form C contact relays. The Common Alarm
output is one output with two sets of contacts.
The point terminations are made using remov-
able terminal blocks. This allows for easier
access to the terminators, streamlining the pro-
cess of connecting external devices to the AC4.
The controller board is a microprocessor-based
platform for program execution.
The firmware, including the operating system
and user-defined data, is stored in nonvolatile
flash read-only memory. Flash ROM may be
easily upgraded at the job site, simplifying the
process of installing new firmware as it
becomes available.
An RS232 operator terminal port is included
with each controller board for operator devices
such as a simple CRT terminal or laptop PC.
Keypad Display
The keypad display is a user interface mounted on the enclosure door of the AC4.
The display provides for complete monitoring
and configuration of the panel and is
password-protected.
The keypad display provides the ability for the
AC4 to operate as a complete standalone
panel.
Back of LCD
Controller Board
Ground wire for LCD
Knockouts and access slots
(top and bottom)
AC4 enclosure - Internal features
LCD for
configuration
and operation
Key
lock
Knockouts and
access slots
on top and
bottom
AC4 enclosure - External features
Point Type Point Count
Digital input 4
Digital output 4
Common Alarm output 2
Keypad
display

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Dimensions
Wiring Specifications
Connection Supported Wire Type Maximum Wire Length Rating
Digital
Input
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
750 ft. (225m)
Dry Contact
(24VDC,
10 mA)
Digital
Output
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
18 AWG*
(recommended) 20 AWG 22 AWG
24VAC
@3A
@3A 50 ft. (15m)
@2A 100 ft. (30m)
@1A 200 ft. (60m)
@3A 40 ft. (12m)
@2A 60 ft. (18m)
@1A 100 ft. (30m)
@3A 25 ft. (7m)
@2A 35 ft. (10m)
@1A 75 ft. (23m)
Common
Alarm
Output
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
18 AWG*
(recommended) 20 AWG 22 AWG
24VAC
@3A
@3A 50 ft. (15m)
@2A 100 ft. (30m)
@1A 200 ft. (60m)
@3A 40 ft. (12m)
@2A 60 ft. (18m)
@1A 100 ft. (30m)
@3A 25 ft. (7m)
@2A 35 ft. (10m)
@1A 75 ft. (23m)
Communication
RS232 Null Modem Cable 50 ft. (15m) N/A
24VAC Power
Connection
(TB7)
18-22 AWG Stranded & Shielded
18 AWG* (recommended)
Non Plenum - Belden 8770
Plenum - Belden 88770
150 ft. (45m) 24VAC
@1.3A
* Recommended
Front view
12"
(304.8mm)
14.25"
(361.95mm)
2.85"
(72.39mm)
Top/bottom view

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© 2004 Liebert Corporation
All rights reserved throughout the world. Specifications subject
to change without notice.
® Liebert and the Liebert logo are registered trademarks of
Liebert Corporation. All names referred to are trademarks or
registered trademarks of their respective owners.
SL-31205 (11/04) Rev. 0
Liebert Corporation
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Telephone: [phone]
Facsimile: 1-614-841-6022
www.liebert.com
AC4 Specifications
Ordering Information
Quantity Part # Description
AC4 AC4 controller board in enclosure
201258P1 RS232 configuration cable
TM115 Transformer Module 115VAC with two 24VAC outputs (40VA each) and 115VAC receptacle
TM230 Transformer Module 230VAC with two 24VAC outputs (40VA each)
DEVICES CONNECTED
TO INPUTS & OUTPUTS
RS232
Liebert
Challenger
3000
Liebert
Himod
Liebert
Challenger
3000
Liebert
Himod
Zone 1 Devices
Device 1 Device 2
Zone 2 Devices
Device 3 Device 4
Power Requirements 24VAC ±10% of nominal
50/60 Hz, 1.3A, 30VA
Dimensions W x D x H, in. (mm) 14-1/4 x 2-3/4 x 12
(361.95 x 69.85 x 304.8)
Weight (Assembled) 7.68 lbs (3.48 kg)
Enclosure Type NEMA 1
Liquid Crystal Display (LCD) Four line, 20 character, backlit
Mounting Surface Building Wall or Structural Member
Ambient Operating
Environment
32°F to 104°F (0°C to 40°C)
0% RH to 95% RH (non-condensing)
Processor Specifics
Model Motorola XC68HC812A4
Clock speed 16MHz
Total RAM 32Kb
Total FLASH 4M
Total EEPROM 4K
A/D Resolution (Analog IN) 12 Bit
Clock Type Real-Time Clock
Clock battery backup type Lithium Cell (non-replaceable)
Clock battery life 7 years, constant, no power
Communications
Local Communications RS232
Agency Listings
UL UL3121
CSA C22.2 NO. 1010
CE Yes
FCC Compliance CFR 47 Part 15
Inputs & Outputs (Quantity)
Digital Inputs (4) Dry Contact Closure
24VDC, 10 mA
Digital Outputs (4) 24VAC, 3A
Common Alarm Outputs (2) 24VAC, 3A
Typical Configuration