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Appendix A
Symptom: Faulty input
Possible explanation
Incorrect OPTO
module used for the
input.
Wiring fault
Symptom: Faulty display contrast
Possible explanation
Faulty internal power
supply to backlight.
Backlight has failed
Symptom: When power applied display is dark and unit beeps
Possible explanation
RAM
Self test has
failed
Check
Required result
Voltage range for
OPTO module
the input module.
colour:
As a quick guide,
look at the colour of
the OPTO module
White: DC module,
by looking though
typically 10-32v DC
the holes in the
back
of
the
controller.
Black: AC module,
typically up to 110v
AC
With
the
Hydro-
When
Control VI powered
applied, LED turns
on, check that the
on.
OPTO switches the
OPTO LED should
light
up.
Apply
correct
voltage
across
the
input
terminals
of
the
OPTO, i.e. for DC
input
module,
0v
connected
to
–
terminal and 24v
connected
to
+
terminal.
Check
Required result
-
Contact
for repair details.
-
Contact
for repair details.
Check
Required result
Remove power and
Correct boot-up
re-apply
Action required on failure
Contact Hydronix for more
details.
voltage
is
Swap module with the same
input range module if one is
available, and re-apply power
across the terminals.
Action required on failure
Hydronix
-
Hydronix
-
Action required on failure
Contact Hydronix for repair
details.
Hydro-Control VI Operators Guide HD0456 Rev 1.7.1
Diagnostics
81
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