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!ONE OR TWO PRESET VERSIONS
!11 SELECTABLE TIME RANGES
!0.5" (12.7 mm) HIGH LIQUID CRYSTAL DISPLAY OR
0.4" (10.2 mm) HIGH LED DISPLAY
!SOLID-STATE CURRENT SINK OUTPUT(S)
!FORM C RELAY OUTPUT(S)
!PROGRAMMABLE TIMED OUTPUT (0.01 sec to 99.99 sec.)
!SIMPLE FRONT PANEL FOR PROGRAMMING EASE
!MEETS DIN PANEL MOUNT SPECIFICATIONS
!REMOTE RESET CAPABILITY
!INSTANTANEOUS & DELAYED CONTACTS
!NON-VOLATILE MEMORY (E2PROM)
!SEALED FRONT PANEL CONSTRUCTION (NEMA 4/IP65)
!ABILITY TO LOCK OUT FRONT PANEL FUNCTIONS
!FRONT PANEL RESET ENABLE/DISABLE
DESCRIPTION
The Libra Series of presettable timers is an economical and reliable solution
to one or two preset timing requirements. The LIBT1 and LIBT1E are the single
preset timer versions and the LIBT2 and LIBT2E are the dual preset timer
versions. All four units have a solid-state output and a form C relay output for
each preset. These units feature a full complement of control inputs,
programmable timed output values, non-volatile memory and many other
features which will satisfy most any single or dual preset timer requirement.
The Libra Timers have two main timing actions, Reset to Zero (RTZ) [Time
Up] and Reset to Preset (RTP) [Time Down]. With RTZ, the timer resets to zero,
times up, and activates the outputs when the preset value(s) are reached. When
RTP is used, the unit starts at the preset value, times down, and activates the
output when zero is reached (single preset unit). For the dual preset version, the
time starts at preset 2 and times toward zero. Output 1 fires when the preset 1
value is reached and output 2 fires when the time reaches zero. There are ten
modes of operation for the single preset unit and sixteen modes of operation for
the dual preset unit.
The Libra Timers also have eleven different selectable time range values.
These include: hours, minutes, or seconds; tenths of hours, minutes, or seconds;
hundredths of hours, minutes, or seconds; and two chronometer time functions
of minutes and seconds; and hours and minutes.
The timed output is programmed through the front panel buttons and can be
programmed from 0.01 sec. to 99.99 sec. (The unit’s timed output is set at the
factory to be 0.1 sec.) The Libra timers have an internal non-volatile memory
device which eliminates the need for battery back-up. When input power is lost,
this device will maintain all data necessary for system operation. A Program
Disable terminal is present, which is used to prevent accidental changes or
tampering by unauthorized personnel to the preset(s) or timed output value(s).
The front panel reset button can also be enabled or disabled by a rear panel DIP
switch. These timers also have an on-line self-test, which checks all display
driver and micro-processor hardware. The self-test can be run at any time
without losing time or missing preset value(s).
Power, input, and output connections are made via removable terminal blocks
located at the rear of the unit. These blocks can accept one #14 AWG stripped
wire. DIP switches at the rear of the unit are used to set the time ranges and to
set the desired operating modes.
The Libra Series timers have a metal die-cast front bezel, which is sealed, and
meets NEMA 4/IP65 specifications for wash-down and/or dust when properly
installed. Mounting clips are provided for easy panel installation.
MODEL LIBT - LIBRA SERIES TIMERS (LCD & LED)
DIMENSIONS In inches (mm) Note: Recommended minimum clearance (behind the panel) for
mounting clip installation is 2.7"(69)H x 4.5"(114)W.
CAUTION: Read complete instructions prior
to installation and operation of the unit. CAUTION: Risk of electric shock.
Bulletin No. LIBT-I
Drawing No. LP0104
Released 12/04
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
www.redlion.net
