ONICON D-100 Flow - Manual (Page 27)

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D-100 Flow Display Manual 10/14 - 0634-14 / 18340 Page 27
SECTION 5.0: DIAGNOSTICS
5.1 DIAGNOSTICS
The ONICON D-100 display is programmable. Factory programmed settings provide rate and
total values in accordance with the customer’s application data. Refer to the D-100 calibration
sheet for a complete listing of factory settings. These settings may be reviewed and changed with
assistance from ONICON factory service personnel. The display is also equipped with diagnostic
indicator lights and self diagnostic test signals that confirm the operation of the microprocessor
and its input circuitry. Please contact the ONICON factory service personnel if any of the
diagnostic lights or test signals listed below indicates a potential problem with the operation of
the Btu meter.
5.1.1 Diagnostic Lights
Low Voltage Power Supply
Located on the power supply board inside the System-10 BTU Meter (refer to page A-3),
these two LEDs will be illuminated when the positive and negative five volt supplies
are present.
Liquid Flow
Located just above the power supply on the motherboard (refer to page A-1) is the flow
indicator LED. The LED will flash at a rate that is proportional to the liquid flow rate.
An unlit LED indicates no flow signal.
5.1.2 Flow Test Signals
Located on the right side of the motherboard (refer to A-1) immediately above the power
supply board is a three position slide switch used to test the flow input. When the switch
is in the top position, the input is connected to the flow meter. When the switch is in the
middle position, the input is connected to two test terminals used to apply a variable
frequency to simulate flow. When the switch is in the bottom position, the input is
connected to a 50/60 Hz signal that simulates a fixed flow rate. Refer to the calibration
certificate to determine the correct display reading when operating in the 50/60 Hz test
mode.
5.1.3 Ai3 & Ai4 Test Signals
As you are facing the component side of the processor board, the Ai3/Ai4 Test push button
is along the top edge of the board just to the left of the flat ribbon cable. It is labeled TEMP
TEST. When pressed, a fixed current will be applied to each sensor input. Both Ai3 and
Ai4 will produce an output equal to 37.5% of their programmed full scale output. This test
confirms the operation of the D-100 processor board input circuitry for Ai3 and Ai4.
IMPORTANT NOTE
The second line of the display will alternate between TEST MODE and the normal display of
engineering units and multipliers whenever the flow test switch is in the TEST or 60 Hz positions.
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IMPORTANT NOTE
After operating for five minutes in either the TEST or 60 Hz mode, the displayed flow and energy
rate will be disabled, and the meter will report a zero flow rate and a zero energy rate to the
network. The meter will remain in this state until the switch is set to RUN.
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