DDMC Analog Input Process Meter / Controller
Instruction Manual
46
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
Check/Action
No display at all
Check power at power connector
Not able to change setup or programming,
Locd
is displayed
Meter is password-protected, enter correct six-digit password to
unlock
Meter does not respond to input change
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.
Meter displays error message during
calibration (
Error
)
Check:
1. Signal connections
2. Input selected in
Setup
menu
3. Minimum input span requirements
Meter displays
1.
999999
2.
-99999
Check:
1. Input selected in
Setup
menu
2. Corresponding signal at Signal connector
Display is unstable
Check:
1. Input signal stability and value
2. Display scaling vs. input signal
3. Filter and bypass values (increase)
Display response is too slow
Check filter and bypass values
Display reading is not accurate
Check:
1. Input signal conditioner selected: Linear, square root, etc.
2. Scaling or calibration
Display does not respond to input changes,
reading a fixed number
Check:
1. Display assignment, it might be displaying max, min, or set
point.
Display alternates between
1.
Hi
and a number
2.
Lo
and a number
Press Menu to exit max/min display readings.
Relay operation is reversed
Check:
1. Fail-safe in
Setup
menu
2. Wiring of relay contacts
Relay and status LED do not respond to signal
Check:
1. Relay action in
Setup
menu
2. Set and reset points
Flashing relay status LEDs
Relays in manual control mode or relay interlock switches
opened.
Meter not communicating with application
programs
Check:
1. Serial adapter and cable
2. Serial settings
3. Meter address and baud rate
If the display locks up or the meter does not
respond at all
Cycle the power to reboot the microprocessor.
Other symptoms not described above
Call Technical Support for assistance.
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.
