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3
34748 A
OPERATING INSTRUCTIONS
The discharge unit is designed for long, trouble-free
service. It features a five-digit display and two push
buttons which are used to interact with the user. A
nine-pin, D-subminiature connector can also be
connected to a terminal or computer to display
discharge data.
The discharge unit is a DC-only unit. Connect the
two alligator clamps to the batteries to power up the
discharge unit. Make sure the clamps are properly
connected to the battery posts. The RED clamp
connects to the positive post (+), and the BLACK
clamp connects to the negative post (-).
WARNING: NEVER DISCONNECT THE
DISCHARGE UNIT FROM THE BATTERIES
WHILE THE UNIT IS OPERATING. THE LARGE
AMOUNT OF ENERGY BEING DISSIPATED BY
THE RESISTIVE ELEMENT COULD CAUSE
DAMAGE TO THE DISCHARGE UNIT IF THE FAN
IS NOT RUNNING.
Pressing the START/STOP button will begin a
discharge cycle. The discharge unit has been
designed to have several methods for terminating a
discharge cycle:
•
Pressing the START/STOP button (can be used
like a pause button)
•
Maximum time shut-off (programmable from 5 -
240 minutes)
•
Shut-off voltage
•
Over temperature shut-off
When a discharge cycle has been terminated, check
to see which type of shut-off has occurred. If the
value in Func2 is the value programmed for the
maximum timer, then the terminating method was by
maximum time shut-off. If the value in Func3 is the
value programmed for the shut-off voltage, then the
terminating method was by shut-off voltage. If
neither of the above methods were true, then the
discharge unit shut-off by over temperature or by
someone pressing the START/STOP button. When
this occurs, make sure nothing is blocking the
ventilation area around the discharge unit (keep unit
at least eighteen inches (18") from walls or other
equipment). Also check and make sure the fan is
operating properly by restarting, then stopping the
unit.
Operating the push buttons
The two buttons control all of the operations of the
discharge unit. The left button is labeled START/
STOP and the right button is labeled DISPLAY.
Both buttons are used in a variety of ways to make
the operation simple.
START/STOP button
When the discharger unit is connected to a set of
batteries, it powers up in the off condition, with
"OFF" being displayed for about five (5) seconds.
Pressing the START/STOP button will start the
discharge unit as indicated by the message "ON". If
the button is pressed again, the unit will shut off, as
indicated by the message "OFF". If this button is
pressed again, the unit will restart and continue from
where it was stopped. As long as the battery
remains connected to the discharge unit, this button
can be used to start and stop a discharge without
losing the total discharge time.
After the unit has stopped, either by maximum timer
or by reaching the shut-off voltage, a test discharge
cycle may be started by pressing the START/STOP
button. A test cycle will run for three minutes, which
should allow you enough time to measure the
individual cell voltages to check for bad cells. If
more time is needed, press the START/STOP button
again to start another test cycle.
DISPLAY button
The DISPLAY button is used to display several
different values. Press the button to show the
function, then release it to show its present value.
The following functions can be displayed:
Func1 - Present battery voltage
Func2 - Discharge time in minutes and seconds
(minutes are displayed on the left and
seconds to the right of the decimal point)
Func3 - Lowest battery voltage reached during
discharge
Func4 - Battery voltage sensed (72)
Func5 - Discharge data printout interval (# of
seconds)
PROGRAMMING INSTRUCTIONS
The discharge unit also has several values which
are programmable. This allows more flexibility to
vary the discharge depending on the batteries and
the desired discharge method. The following values
can be programmed:
•
Maximum discharge time
•
Shut-off voltage
•
Terminal format
The values for these variables can be changed at
any time, even while a discharge cycle is running.
Changing the maximum timer
The default discharge time is 240 minutes. This
value is the maximum time the discharge unit allows
to discharge a set of batteries.
