14
RUN MODE
Once the unit is installed, it normally displays a value which is updated every 0.4
seconds. However, each time the display updates, the new value is compared
internally to captured maximum and minimum values. If the new value is greater
than the maximum, or less than the minimum, then it becomes the new max or
min value held in memory. The max and min capture and hold process is always
going on. In order to display the max value, press the up arrow key. The max
value will remain on the display for as long as the key is pressed, and for
another 2.5 seconds after the key is released. To display min value, press the
down arrow key. The min value also remains on the display as long as the key is
pressed, and for another 2.5 seconds after it is released. To reset both the max
and min values to the latest update value, press and hold both up and down
arrow keys for 2 seconds. The display will read reset (rSt), and then it will revert
to the update display once the reset is complete.
The final variation of the run mode display occurs only in units that are equipped
with the optional output relay board. If relay 1 is ON (alarm active), the display will
flash the update value. Users that do not want the display to flash during an
alarm state should use relay 2 as the alarm relay.
DIAGNOSTICS
Self Diagnostics and Error Messages
Each time power is applied to the DPM, it performs a series of internal diagnostic
tests. A lamp test (all display segments ON) is conducted while these tests are in
progress. If a failure occurs, an error message will appear on the display. Addition-
ally, once the unit is up and running, an out of range message (flashing
or
)
may occur, indicating that the scaled input signal (display reading) is greater than
9999 or less than -9999 respectively (disregard the decimal point place).
The diagnostic tests are checksum calculations of internal memory, to verify that
data stored in memory at power down is still there at power up. The first tests are
performed on internal ROM and RAM. Failure results in an error message
.
This error is non-recoverable, and the unit should be returned to the factory for repair.
Programming and calibration data is stored in non-volatile memory (NOVRAM). A
failure in the programming section of NOVRAM results in the displayed error mes-
sage
, which remains on the display until power is cycled OFF, then ON, to the
unit, or until a key is pressed. When a
errors occur, the unit loads default
PROGRAMMING cont. /RUN MODE/ DIAGNOSTICS
Relay Hysteresis. Enter the value in display
units between the relay turn ON
values and relay turn OFF values.
Range: 0 to 999.