44 Configuration and Calibration Guide HD0679 Rev 1.2.0
1.2
Symptom: Incorrect Analogue Output
Possible
explanation
Check
Required result
Action required on
failure
Wiring problem
Wiring at the
junction box and
PLC
Twisted pairs used
for complete length
of cable from sensor
to PLC, is wired
correctly
Wire correctly using
specified cable in
the technical
specification
Sensor’s analogue
output is faulty
Disconnect the
analogue output
from the PLC and
measure with an
ammeter
Milliamp reading
within the normal
range (0-20mA, 4-
20mA)
Connect sensor to a
PC and run Hydro-
Com. Check
analogue output on
the diagnostics
page. Force the
mA output to known
value and check
this with an
ammeter
PLC analogue input
card is faulty
Disconnect the
analogue output
from the PLC and
measure the
analogue output
from the sensor
using an ammeter
Milliamp reading
within the normal
range (0-20mA, 4-
20mA)
Replace analogue
input card
1.3
Symptom: Computer Does Not Communicate with the Sensor
Possible
explanation
Check
Required result
Action required on
failure
No power to sensor
DC power at
junction box
+15Vdc to +30Vdc
Locate fault in
power supply/ wiring
RS485 incorrectly
wired into converter
Converter’s wiring
instructions and A
and B signals are
the correct
orientation.
RS485 converter
correctly wired
Check PC Com port
settings
Incorrect serial Com
Port selected on
Hydro-Com
Select correct Com
Port on Hydro-
Com.
Switch to the correct
Com Port
Determine the Com
Port number
assigned to the
actual port by
looking at the PC
device manager
More than one
sensor has the same
address number
Connect to each
sensor individually
Sensor is found at
an address.
Renumber this
sensor and repeat
for all the sensors
on the network
Try an alternative
RS485-RS232/USB
if available
Summary of Contents for Hydro-Mix
Page 4: ...4 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 6: ...6 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 8: ...8 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 10: ...10 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 14: ...Chapter 1 Introduction 14 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 28: ...Chapter 2 Configuration 28 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 42: ...Chapter 4 Best Practices 42 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 48: ...Chapter 5 Sensor Diagnostics 48 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Page 52: ...Appendix A Document Cross Reference 52 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
