3
MODE 0 LATCH OUTPUT AT PRESET, MANUAL RESET TO ZERO, TIME
STOPS AT PRESET (ACCUMULATING DELAY ON MAKE, TIME UP)
In this mode, as the unit times up from zero, the output will
latch-on when the preset is reached. Also, the unit will stop timing
when preset is reached. When a manual reset✰occurs, the unit will
Reset to Zero and the output if latched on, will unlatch.
To use as a DELAY ON MAKE timer, set the preset value to the desired
delay value. When “RUN” is at a low level, time will increment. The output
will activate when the preset is reached. To recycle use 1) reset, or 2) set the
power-up reset switch to enable, then remove and reapply input power.
MODE 1 LATCH OUTPUT AT PRESET, MANUAL RESET TO ZERO, TIME
CONTINUES AT PRESET (ACCUMULATING DELAY ON MAKE,
TIME UP)
In this mode, as the unit times up from zero, the output will latch
on when the preset is reached. Time will continue to accumulate
after the preset is reached. When manual reset✰occurs, the unit
will Reset to Zero, and the output, if latched on, will unlatch.
To use as a DELAY ON MAKE timer, follow the description under Mode 0.
MODE 2 & 3 - ✰✰
MODE 4 TIMED OUTPUT AT PRESET, MANUAL RESET TO ZERO, TIME
STOPS AT PRESET
In this mode, as the unit times up from zero, the output will turn
on when the preset is reached. The output will turn off after its
programmed time value has occurred. Also, the unit will stop
timing when the preset is reached. When a manual reset occurs, the unit will
Reset to Zero. Manual reset✰will terminate the timed output, if the output is
still turned on.
MODE 5 TIMED OUTPUT AT PRESET, AUTOMATIC RESET TO ZERO AFTER
TIMED OUTPUT (OFF/ON RECYCLING, TIME UP)
In this mode, as the unit times up from zero, the output will turn
on when the preset is reached. The output will turn off after its
programmed time value has occurred. Also, at the end of the timed
output, the unit will automatically Reset to Zero and start the cycle over.
Manual reset✰will turn off the output, if turned on, and reset the time to zero.
When used as an OFF/ON RECYCLING timer, the total cycle time is the
sum of the preset value plus the programmed timed output value. The ON
delay value is equal to the programmed timed output value.✝✝ When “RUN”
is at a low level, time will increment. The output (ON delay) will activate when
the preset is reached. The unit will recycle at the end of the timed output.
MODE 6 TIMED OUTPUT AT PRESET, AUTOMATIC RESET TO ZERO AT
PRESET ✝(OFF/ON RECYCLING, TIME UP)
In this mode, as the unit times up from zero, the output will turn
on when the preset is reached. The output will turn off after its
programmed time value has occurred. Also, when the preset is
reached, the unit will automatically Reset to Zero and start the cycle over. (The
output will remain on until its time value has occurred.) Manual reset✰will
turn off the output, if turned on, and reset the time to zero.
When used as an OFF/ON RECYCLING timer, the total cycle time is the
preset value. The ON delay value is equal to the programmed timed output
value.✝✝ When “RUN” is at a low level, time will increment. The output (ON
delay) will activate when the preset is reached. The unit will recycle at the
beginning of the timed output.
MODE 7 - ✰✰
✰- Manual reset, either by front panel reset (if enabled) or remote reset, is
always active, and will override any condition or state of the timer.
✰✰ - These modes are not applicable to the single preset Libra timer (they are
used only for the two preset timer unit).
MODE 8 LATCH OUTPUT AT ZERO, MANUAL RESET TO PRESET TIME
STOPS AT ZERO (ACCUMULATING DELAY ON MAKE, TIME
DOWN)
In this mode, as the unit times down from preset, the output will
latch on when zero is reached. Also, the unit will stop timing when
zero is reached. When a manual reset✰occurs, the unit will Reset
to Preset and the output, if latched on, will unlatch.
To use as a DELAY ON MAKE timer, set the preset value to the desired
delay value. When “RUN” is at a low level, time will decrement. The output
will activate when the zero is reached. To recycle use 1) reset, or 2) set the
power-up reset switch to enable, then remove and reapply input power.
MODE 9 LATCH OUTPUT AT ZERO, MANUAL RESET TO PRESET, TIME
CONTINUES AT ZERO (ACCUMULATING DELAY ON
In this mode, as the unit times down from preset, the output will
latch on when zero is reached. Time will continue to accumulate
after zero is reached. When a manual reset✰occurs, the unit will
Reset to Preset, and the output, if latched on, will unlatch.
To use as a DELAY ON MAKE timer, follow the description under Mode 8.
MODE 10 & 11 - ✰✰
MODE 12 TIMED OUTPUT AT ZERO, MANUAL RESET TO PRESET, TIME
STOPS AT ZERO
In this mode, as the unit times down from preset, the output will
turn on when zero is reached. The output will turn off after its
programmed time value has occurred. Also, the unit will stop timing
when zero is reached. When a manual reset✰occurs, the unit will Reset to Preset.
Manual reset✰will terminate the timed output, if the output is still turned on.
MODE 13 TIMED OUTPUT AT ZERO, AUTOMATIC RESET TO PRESET
AFTER TIMED OUTPUT (OFF/ON RECYCLING, TIME DOWN)
In this mode, as the unit times down from preset, the output will
turn on when zero is reached. The output will turn off after the
programmed time value has occurred. Also, at the end of the timed
output, the unit will automatically Reset to Preset and start the cycle over.
Manual reset✰ will turn off the output, if turned on, and reset the time to the
preset value.
When used as an OFF/ON RECYCLING timer, the total cycle time is equal
to the sum of the preset value plus the programmed timed output value. The ON
delay value is equal to the programmed timed output value.✝✝ When “RUN” is
at a low level, time will decrement. The output (ON delay) will activate when
zero is reached. The unit will recycle at the end of the timed output.
MODE 14 TIMED OUTPUT AT ZERO, AUTOMATIC RESET TO PRESET AT
ZERO ✝(OFF/ON RECYCLING, TIME DOWN)
In this mode, as the unit times down from preset, the output will
turn on when zero is reached. The output will turn off after its
programmed time value has occurred. Also, when zero is reached,
the unit automatically resets the time to the preset value and starts the cycle
over. Manual reset✰will turn off the output, if turned on, and reset the timer
to the preset value.
When used as an OFF/ON RECYCLING timer, the total cycle time is the
preset value. The ON delay value is equal to the programmed timed output
value.✝✝ When “RUN” is at a low level, time will decrement. The output (ON
delay) will activate when zero is reached. The unit will recycle at the beginning
of the timed output.
MODE 15 - ✰✰
✝- The timed output value must be less than the value required to time from the
reset condition to the preset point. Otherwise, the output will appear to be
latched on.
✝✝ - The maximum ON delay is 99.99 seconds.
Mode settings of the switches are shown to the right of the text below. The
mode number corresponds to a binary code, represented by the DIP switch
positions. When the switch is “UP”, it is equivalent to a zero. When the switch
is “DOWN”, it is equivalent to a one. The mode switch settings can be easily
observed from the panel front by using the self-test. Near the end of self-test,
the state of these mode switches are displayed.
MODES OF OPERATION
MODES OF OPERATION FOR SINGLE PRESET LIBRA TIMER
The Libra timers have internal diagnostics which will check the stored data
during power-up. When the data is saved (power-down), computations are made
with these values. The result of these computations is stored in the memory to
serve as a check against possible error. Then on power-up, these same
computations are repeated on the stored data. If these results do not agree with
the stored results, then a “P” will appear on the right side of the display. Normal
operation of the unit will continue while this “P” displayed. To remove the “P”
from the display, press the “E” button. Then check programmed values to be
certain they are correct.
POWER-UP DIAGNOSTICS
