Precision Digital PD865 - Manual (Page 68)

PD865 Snooper Modbus Serial Input Meter Instruction Manual
68
Troubleshooting Tips
Symptom Check/Action
No display at all. Check power at power connector.
Check fuses (not supplied).
Not able to change setup or
programming, LoCd is displayed. Meter is locked, enter correct four-digit
password to unlock.
Meter displays error message
during scaling (error). Check input points for similar values.
Master displays a different value
than PD865 display. Check master data type setting. Make
sure it matches the PD865 data type
found in the Register Table.
PD865 Master displays a different
value than slave device. Check PD865 data type setting. Make
sure it matches the slave data type.
PD865 Snooper mode going into
communication break Increase baud rate and/or poll time.
Display alternates between:
1. Hi and a number
2. Lo and a number
Press Menu to exit Max/Min display
readings.
Display flashes -199999. The data is less than the Input 1 value.
Use a lower value for Input 1.
Display flashes 999999. The data is greater than the last Input
point value. Use a higher value for the
last Input point.
Display response is too slow. Check filter and bypass values.
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.
Meter is not communicating. Check:
1. Serial cabling (swapped lines).
2. Slave ID, parity, and baud rate.
Meter display occasionally jumps
to another value. Check that the polling time is not too
fast for the chosen baud rate. For
example, a polling time of 0.1 seconds
is too fast for 2400 baud.
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.