Liebert AC8 User Manual

AC8

Product Specification/Installation Sheet

Description

The Liebert AC8 is ideal for coordinated control of systems with redundant equipment, such as multiple environmental units or pumps. When the AC8 controller detects an alarm in an operating device, the AC8 enables a standby device and controls the device in alarm as configured, either leaving that device operating or disabling it.

The AC8 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 AC8 can perform routine testing of standby devices and alert personnel if a standby device fails an operating test and requires attention.

The staging feature permits standby devices to be turned on or off when a sensor detects specified levels. For example, the AC8 might be configured to turn on a fan when the temperature reaches 75°F, then turn on a second fan at 80°F. When the temperature falls below 80°F, the second fan is turned off; when it drops below 75°F, the first fan is turned off. Liebert’s TW420 Temperature Transmitter may be connected to any of the four analog sensor inputs for staging and other functions.

Another capability of the AC8 is monitoring the status of connected devices and keeping personnel apprised through local alarming. The AC8 employs local alarming and remote paging services to keep personnel on-site and at remote locations apprised of the status of equipment.

The AC8 controller can interface with anything that closes an electrical contact. To improve process efficiency and troubleshooting, the controller tracks data in three types of logs: alarm, event and trend.

The AC8 has both a local LCD interface and a remote dial-up interface for configuration and monitoring. Liebert’s SiteScan Web may also be used for monitoring, as well as some configuration functions.

When an alarm condition arises, the AC8 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. If configured, the controller also sends pager notifications.

Features and Benefits

• Custom configuration for specific applications

• Paging capability—up to four pager numbers

• Preconfigured on-board modem

• Alarm, Event and Trend logs with time and date stamp

• Battery backup to ensure alarm notification

• Backup and download configuration files

• User interface via RS232 or modem connection

• On-board audible alarm

• Configuration data permanently stored in nonvolatile Electrically Erasable Programmable Read Only Memory (EEPROM) for protection against power loss

• Real-time clock

For other applications, contact your local Liebert representative or call 1-800-222-5877.

• Status LEDs for verification and diagnostics

Hardware and Components

BAR CODE

Enclosure

The AC8 comes standard in an enclosure, which features a key lock for added security. The enclosure is made of metal to accommodate secure conduit fittings and protect components against environmental debris.

AC8 enclosure - External features

Knockouts and access slots on top and bottom

• 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 controller board and Transformer Module.

Keypad Display

The keypad is a user interface mounted on the enclosure door of the AC8. The liquid crystal display (LCD) provides for complete monitoring and configuration of the panel and is password-protected. The keypad display provides the ability for the AC8 to operate as a complete standalone panel.

Key lock

LCD for configuration and operation

Keypad

Controller Board

The controller board supports these connections:

• Eight devices, with 1 digital input and 1 digital output per device

• Up to four zones, with staging for each zone

• Four 4-20mA analog inputs (one sensor per zone)

• Two programmable digital relay outputs

• Two Common Alarm outputs

•One EPOP input

The digital inputs are dry contacts. The analog inputs are 4-20mA inputs. The digital outputs, programmable relay 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 removable terminal blocks. This allows for easier access to the terminators, streamlining the process of connecting external devices to the AC8.

The controller board is a microprocessor-based platform for program execution. The firmware may be easily upgraded at the job site, simplifying the process of installing new firmware as it becomes available. Configuration data is stored in nonvolatile EEPROM to protect against power loss.

An RS232 operator terminal port is included with each controller board for operator devices such as a simple CRT terminal or laptop PC.

An integrated on-board modem allows remote access to the AC8. The modem is factory-configured, eliminating field configuration and wiring requirements. An RJ11 phone modem jack is also included.

An IGM422 connection permits access to Liebert’s SiteScan Web Enterprise Monitoring System. This connection allows information and alarms to be monitored from a centrally located command center.

Transf ormer Module

Manual Override Switch (outputs)

Power On/Off switch

Power receptacle

Power On/Off switch

Modem

Phone line connector

AC8 Components and Key Features

Battery pack

TB7:

START

24V INPUT

Serial interface connector (RS232 / EIA574)

P23: BATTERY

BATTERY

J11: PHONE

PIN 3-TIP PIN 4-RING

BAR CODE

LIEBERT

LCD CONTRAST

TP1

VBATT

GND

2345678

OFF

MODEM

DIP

Audible horn

TB5: COMMON ALARM

NO C NC

LS1

ENABLE

P11

AUDIBLE

Q11

OUTPUT1

DS56

OUTPUT2

DS54

OUTPUT3

DS63

OUTPUT4

DS61

OUTPUT5

DS60

OUTPUT6

DS62

OUTPUT7

DS55

OUTPUT8

DS57

CTRLLOCK

DS59

DS83

SENLOCK

DS58

CAN TX

CMN ALR

DS84

DS53

CAN RX

MOP F PROG 574 TX 574 RX 485 RX 485 TX

INPUT1 INPUT2 INPUT3 INPUT4

DS70

INPUT5

DS67

INPUT6

DS66

INPUT7

DS65

INPUT8

DS64

R334

C71

1-2 TOP 3-4 BOTTOM

485

(TOP)

—

——

+ +

422

TB9: ANALOG

—

+—+

(BOTTOM)

GROUND

—

SiteScan Web connector (EIA422)

RELAY OUTPUTS

(TOP)

NO C NC

BOTTOM

TOP

PFM5 PFM2

TB1

EPOP INPUT

EPOP

P19

EPOP

DIS EN

TB1, TB2 INPUTS: DRY CONTACTS ONLY.

TB3, TB4, TB5 OUTPUT RELAY

RATINGS: 24V, 3A

CLASS 2 ONLY.

RELAY OUTPUTS

(TOP)

REV

TB2: CONTACT

ASS

INPUTS

TB1: EPOP CONTACT INPUT

Common Alarm connectors

Control relay outputs

TB4:

(BOTTOM)

Digital output connectors

Digital input connectors

EPOP contact input

Analog input connectors

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