090-252 Rev A
2-5
When option 1 is selected, the current values for these quantities will be
shown. If it is not desired to change these values, simply press ESC to
return to the menu. If it is necessary to change these quantities, press
EDIT and you will be prompted to enter new values.
When prompted to enter new values, you must enter a value even if the
new value will be the same as the old value. Enter each value after the
prompt until the last value is reached and the new parameters are sent to
the host. If you unplug the HHPC before entering all the values, the new
values will not be sent to the host.
2.2.2.1.2 Option 2, Reference, Interlock
This option allows the user to edit Reference and Interlock. Reference is
the value that will be displayed when the probe is resting on the bottom of
the tank. This compensates for the height of the level sensors from the
bottom of the probe.
Interlock is the highest level that the probe will be allowed to drive. This
value should be set to a level just above the highest possible level of liquid
in the tank. Interlock prevents the probe from being accidentally driven
out of its normal environment up into the probe enclosure where it will hit
the mechanical unit and stop due to a reel alarm.
2.2.2.1.3 Option 3, Drive Control
This option gives the user access to Drive Disable and Reel Alarm
Disable. If Drive Disable is set to a "1", drive commands sent to the host
will have no affect on the mechanical system and the probe will not move.
This feature is useful during maintenance work when the mechanical unit
is partially disassembled and it would not be safe to drive the unit at all. If
Drive Disable is set to "0", the system will be allowed to drive normally.
Reel Alarm Disable allows the user to bypass a normal safety feature.
The system has been designed to provide positive feedback that the drive
cable is moving when pulses are sent to the motor. This is accomplished
by magnets located on the take up reel which cause the reel feedback
switch to open and close when they pass under it. If these state changes
are not detected after a certain number of motor pulses has been sent out,
the motor is stopped and a reel alarm is generated. Under certain
circumstances however, this feedback signal is not available and the
motor must be driven anyway. Setting Reel Alarm Disable to a "1" will
allow the motor to drive even when no reel feedback signals are detected.
The legend "RA Disable" will be shown in the continuous display mode to
remind the user that reel alarm has been disabled.
NOTE: Under normal circumstances, Reel Alarm Disable should not be
set! Damage to the system may result if an obstruction of some kind
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