Liebert Autochangeover Controllers AC8 - Manual (Page 2)

2
Hardware and Components
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.
• 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.
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.
LCD for
configuration
and operation
Key
lock
Knockouts and
access slots
on top and
bottom
AC8 enclosure - External features
Keypad
AC8 Components and Key Features
BAR CODEBA
R C
OD
E
LIEBERT
BATTERY
LCD CONTRAST
VBATT
START
TB7:
24V INPUT
P23:
BATTERY
485
+ —
+ —
(TOP)
(BOTTOM)
422
RELAY
OUTPUTS
TB4:
(BOTTOM)
2
TB3, TB4, TB5 OUTPUT RELAY
RATINGS: 24V, 3A CLASS 2 ONLY.
TB2:
CONTACT
INPUTS ASS
EPOP
EPOP INPUT
EPOP
P19
TB1
DIS EN
REV
PFM5
PFM2
(BOTTOM) (TOP)
4
3
2
1
8
7
6
5
(BOTTOM) (TOP)
4
3
2
1
8
7
6
5
J11: PHONE
PIN 3-TIP PIN 4-RING
MODEM
TB5: COMMON ALARM RELAY OUTPUTS
BOTTOM
TOP
Q11
P11
+ LS1
ENABLE AUDIBLE
(TOP) NO C NC NO C NC
TB1: EPOP
CONTACT
INPUT
TB1, TB2 INPUTS:
DRY CONTACTS ONLY.
TB9: ANALOG GROUND AG
+ + — —
+ — + —
3-4 BOTTOM 1-2 TOP
ON
MODEM
CAN TX CAN RX DS83
DS84
1
ON ON
TP1 GND
S2 OFF
DIP
2 3 4 5 6 7 8
OUTPUT1 DS56 DS54 DS63
DS61 DS60
DS62 DS55 DS57
DS59 DS58
DS53
MOP F PROG 574 TX
574 RX
485 RX
485 TX
OUTPUT2 OUTPUT3 OUTPUT4
OUTPUT5 OUTPUT6 OUTPUT7 OUTPUT8
CTRLLOCK SENLOCK CMN ALR
INPUT1
DS70 DS67 DS66 DS65 DS64 R334
INPUT2 INPUT3 INPUT4
INPUT5 INPUT6 INPUT7 INPUT8 C71
NC C
NO
NC
C NO
Digital output
connectors
Digital input
connectors
Phone line
connector
Serial interface
connector (RS232 / EIA574)
Transformer
Module
Manual Override
Switch (outputs)
Modem
Battery pack Power On/Off switch
Analog input
connectors
Power receptacle
Power On/Off
switch
SiteScan Web
connector (EIA422)
Audible horn
Common Alarm
connectors
EPOP contact
input
Control relay
outputs