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DDMC Analog Input Process Meter / Controller
Troubleshooting Tips
This meter is a highly sophisticated instrument with an extensive list of features and capabilities. If the front panel
buttons are used to program the meter, it may be a difficult task to keep everything straight. That is why we strongly
recommend the use of the free DDMC Meter View software for all programming activities. A cable is provided with the
meter for programming with DDMC Meter View software.
If you have programmed the meter with the front panel buttons and it is not working as intended, try
re-programming the meter using DDMC Meter View software.
Symptom
No display at all
Not able to change setup or programming,
Locd is displayed
Meter does not respond to input change
Meter displays error message during
calibration (Error)
Meter displays
1.
999999
2.
-99999
Display is unstable
Display response is too slow
Display reading is not accurate
Display does not respond to input changes,
reading a fixed number
Display alternates between
1.
Hi and a number
2.
Lo and a number
Relay operation is reversed
Relay and status LED do not respond to signal
Flashing relay status LEDs
Meter not communicating with application
programs
If the display locks up or the meter does not
respond at all
Other symptoms not described above
Note: Certain sequences of events can cause unexpected results. To solve these issues, it is best to start fresh from
factory defaults and use the manual as a step by step programming guide, rather than a random approach to
programming. To reset the meter to factory defaults, see Reset Meter to Factory Defaults on page 44. In addition, for
best results, we recommend using the free DDMC Meter View software for all programming needs.
Check/Action
Check power at power connector
Meter is password-protected, enter correct six-digit password to
unlock
If a Low-Flow Cutoff Value has been programmed, the meter will
display zero below that point, regardless of the input – which can
appear like the meter is not responding to an input change. Check
to make sure the problem is not being caused by an undesired
low-flow cutoff value.
Check:
1.
Signal connections
2.
Input selected in Setup menu
3.
Minimum input span requirements
Check:
1.
Input selected in Setup menu
2.
Corresponding signal at Signal connector
Check:
1.
Input signal stability and value
2.
Display scaling vs. input signal
3.
Filter and bypass values (increase)
Check filter and bypass values
Check:
1.
Input signal conditioner selected: Linear, square root, etc.
2.
Scaling or calibration
Check:
1.
Display assignment, it might be displaying max, min, or set
point.
Press Menu to exit max/min display readings.
Check:
1.
Fail-safe in Setup menu
2.
Wiring of relay contacts
Check:
1.
Relay action in Setup menu
2.
Set and reset points
Relays in manual control mode or relay interlock switches
opened.
Check:
1.
Serial adapter and cable
2.
Serial settings
3.
Meter address and baud rate
Cycle the power to reboot the microprocessor.
Call Technical Support for assistance.
46
Instruction Manual
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Table of Contents
Troubleshooting
