Table of Contents
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Appendix A
The following tables list the most common faults found when using the controller. If you are unable to
diagnose the problem from this information, please contact Hydronix technical support on +44 1483
468900 or by email: support@hydronix.com.
Symptom: Displays shows 'Searching For Sensor' - no output from sensor
Possible explanation
No power to sensor.
Sensor has temporarily
locked up
Sensor
MIL-Spec
connector
pins
are
damaged
Internal
failure
or
incorrect configuration
Symptom: Incorrect sensor readings
Possible explanation
Sensor Unscaled
readings are incorrect
Incorrect recipe
calibration
Check
Required result
DC power at rear of
+24v DC
Hydro-Control
VI,
pins 31 + 33
Power down and re-
Sensor
power sensor
correctly
Disconnect
the
Pins are bent and
sensor cable and
can
check if any pins are
normal
damaged.
electrical contact.
Connect the sensor
Digital
to a PC using the
connection
Hydro-Com
working.
software
and
a
suitable
RS485
converter.
Check
Required result
Press
Display
Readings should be
Unscaled
on
the
the following:
Overview Screen
Sensor exposed to
air = close to zero.
Hand on sensor =
75-85
Check
recipe
for
Moisture offset = 0
parameters
to -5
'moisture gain' and
Moisture
'moisture offset'
0.12 to 3
Action required on failure
Locate
supply/wiring
functions
Check sensor connector pins
Check sensor configuration by
be
bent
to
connecting to a PC.
to
make
RS485
Digital RS485 connection is
is
not working. Sensor should be
returned to Hydronix for repair.
Action required on failure
Contact Hydronix for more
details.
Recalibrate
instructions
Moisture signal should be
gain
=
stable at the end of the first
and
final
increased accuracy.
Hydro-Control VI Operators Guide HD0456 Rev 1.7.1
Diagnostics
fault
in
power
recipe
as
per
in
Chapter
8.
mix
times
for
79
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