- 2 - AT4/AT4B Installation Guide
Overview:
Altronix AT4/AT4B are extremely versatile 24 Hour 365 Day Event Timers designed to support a wide range
of applications. Such applications include: Home and Building Automation, Security, Access Control, Lighting
Control, etc.
AT4/AT4B are equipped with four independently controlled form “C” relay contacts that provide many latch-
ing and/or momentary operations during a program schedule of your choice. The EE prom memory allows for
programming of unit prior to/or during field installation. Events may be set for single or multiple operations on a
daily and/or weekly schedule. The block programming feature enables repeating an event on any combination of
consecutive days. AT4/AT4B will compensate for daylight savings time if desired. It automatically adjusts for leap
year. Individually selected holiday exceptions can be programmed to override regularly scheduled events.
Specifications:
Input:
• 12 to 24 VAC or VDC operation.
Relay:
• Standby current: 20mA with relays off combined
with 40mA for each relay on.
• Four (4) Form “C” relay contacts are rated
10A @ 120VAC/28VDC.
• Each relay operates independently.
Events/Programming:
• Momentary and/or Latching Events.
• 254 individually programmed daily/weekly events.
• Block programming capacity can accommodate a
total of 1778 events per week.
• 254 programmable Holiday dates.
Battery Backup:
• Built-in charger for 12VDC sealed lead acid or gel
type batteries (Max. charge current 300mA).
• Lithium battery backup maintains clock.
Order Altronix part # LB2032.
Features:
• EE Prom memory protects against loss of
programming due to power failure.
• Clock synchronization 60Hz (AC operation).
• Accurate crystal controlled clock (DC operation).
• “First man in” option.
• Standard or Daylight Savings Time settings.
• Automatic compensation for leap year.
Display:
• Alphanumeric LCD display simplifies programming.
Electrical:
• Operating temperature: – 20º C to 49º C ambient.
Mechanical:
• Enclosure Dimensions (H x W x D approx.):
12” x 7.5” x 4.5” (304.8mm x 190.5mm x 114.3mm).
• Board Dimensions (L x W x H approx.):
7” x 5.5” x 1.2” (177.8mm x 139.7mm x 30.48mm).
Installation Instructions:
1. Mount AT4 enclosure in desired location.
Carefully Review:
Basic Operation (pg. 3)
Terminal Identification Table (pg. 3)
Keyboard Layout and Description (pg. 4)
Programming Instructions (pgs. 5-6)
2. Connect 12 to 24 Volts AC or DC to terminals marked [– DC +]. When using DC carefully observe polarity.
3. Connect 12VDC battery (optional) to terminals marked [BAT –] and [BAT +] .
4. Insert lithium battery (not supplied or required. Altronix part # LB2032) in battery holder as shown in
Fig. 1, pg. 4 with the (+) positive side facing up.
Note: Lithium Battery (LB2032) must only be installed after initial power up of AT4/AT4B.
5. Connect devices to be controlled to dry outputs marked RLY1 [NC, NO, C] - RLY4 [NC, NO, C]
Note: It is important when connecting DC powered electromechanical devices such as Mag Locks, Electric
Strikes, Bells, Relays, etc. to install a catch diode across the pos (+) and neg (–) terminals of the device.
Connect diode as close to the device as possible with the banded side facing the pos (+) terminal. This will
reduce the possibility of interference.
6. Program clock and desired event schedule (Programming Instructions pg. 4-6).