62
b) Analog Input Calibration
The DPC analog input calibration involves calculation and storing the offset and span
variables in the EEPROM based on two calibration points (0 and 100% F.S.). The 0-5,
0-10 and the 4-20 mA inputs require scale and offset variables to be calculated based
on the applied calibration signals.
NOTE: The analog inputs available in the DPC controller were calibrated at the
factory. There is no need to perform analog input calibration unless the analog
to digital converter (ADC) IC, input amplifi er IC, or passive components from
analog input circuitries were replaced or your factory customer support
representative suggested recalibration. Any alteration of the analog input
scaling variables in the EEPROM will void the calibration warranty supplied
with the instrument.
Power up the DPC controller for at least 30 minutes prior to commencing the
calibration procedure. Observe the current analog input mode settings.
Connect the corresponding type of reference signal source device (voltage source for
0-5 or 0-10 Vdc input calibration, and current source for 4-20 mA calibration) to
pins 3 (plus) and 4 (minus) of the 8-pin MiniDIN connector.
Apply required signals levels according to fi rmware prompts and confi rm it by
pressing Ent joystick button. If you need to abort calibration, press the Esc button.
When the calibration is complete, the fi rmware will display new offset and span values
and ask the user to press the joystick ENT button to save the new calibration variables
to the EEPROM, or to press the Esc button to abort calibration and exit without
saving any changes. When the process is done, the fi rmware will prompt the user
with a confi rmation message.
c) Analog Input Test
This menu selection must be used only for troubleshooting purposes as requested by
your customer support representative. It allows monitoring analog set point input
values (in % of full scale) by applying a different signals to instruments input
terminals (pins 3 (plus) and 4 (minus) of the 8-pin MiniDIN connector).
CAUTION: Do not apply voltages above 12Vdc to the instrument
analog input terminals. Doing so might cause damage to the analog input
circuitry or result in erroneous readings.
6.4.15.9 Status LED Settings
DPC series Mass Flow Controllers are equipped with dual color LED which allows signaling
a variety of different events with combinations of three colors (red, green and amber) and
a specifi c time pattern. Status LED operation can be adjusted/ fi ltered for the indication of
different events based on custom user needs.
Status LED can be set to the following modes (see Figure 19):
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