Hydronix Hydro-Control VI Installation Manual page 97

Appendix B
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
When the OPTO When voltage is
switches on the applied, LED turns
OPTO LED should on. Hydro-Control
light up. Apply must be powered
correct voltage for this.
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 Hydronix
for repair details.
- Contact Hydronix
for repair details.
Check Required result
Remove power and Correct startup
re-apply
Action required on failure
Contact Hydronix for more
details.
Swap module with the same
input range module if one is
available, and re-apply power
across the terminals.
Action required on failure
-
-
Action required on failure
Contact Hydronix for repair
details.
Hydro-Control VI Installation Guide HD0455 Rev 1.9.0
Diagnostics
97