Chapter 14 Frequently Asked Questions - Hydronix Hydro-Control VI Operator's Manual

Chapter 14
Q: The Hydro-Control display continually says "Searching For Sensor on address xx"
A: This message indicates that there is a problem with the communication between the Hydro-
Control VI and the sensor. The first thing to check is cabling between the sensor and the
controller. Try switching off power, this would reset the sensor and the controller. If the
problems still exist, see Appendix A for more details on communication diagnostics.
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Q: How do I recalibrate the touch screen?
A: If the calibration on the touch screen is incorrect, then you can push the small recessed button
on the top panel of the Hydro-Control next to the CompactFlash card panel. A screwdriver or
pencil can be inserted to push the button which restarts the touch screen calibration utility.
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Q: I ordered AC modules instead of DC modules, so I added my own relay to switch over from AC
in the Hydro-Control VI to DC. Why can't I get the Hydro-Control AC outputs to work?
A: It is possible that the AC outputs are not working because there is not enough load on the
OPTO switch. In this case the AC output will be connected to the coil of the relay. Therefore
the load on this switching voltage is determined by the resistance of the coil only which may not
be high enough. The minimum load current so that the OPTO will switch is 20mA. Try adding
a resistor in parallel with the coil to provide some extra switching current.
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Q: I think one of the I/O modules is faulty, how do I replace them?
A: If you suspect a faulty OPTO module, swap over an identical OPTO from a working input or
output which you know works. This will tell you if the original OPTO was faulty. If you need a
replacement then either contact Hydronix or source them from a local OPTO 22 supplier. See
the Installation Guide for more details.
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Q: Can I adjust the contrast on the display?
A: There is no way of adjusting the contrast of the display on a Hydro-Control VI. If either the
backlight or the contrast if faulty, then the unit will need to be repaired by Hydronix.
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Q: We had a lightning strike and now the unit doesn't work properly, can I do any onsite repairs?
A: It is not possible to do any repairs onsite, and any attempts of onsite repairs will invalidate any
warranty outstanding. In such cases the equipment should be sent back to Hydronix for repair.
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Q: I ordered a 110v AC unit but the label on the back shows a 24v DC power input. Is this labelling
a mistake, should I just wire 110v AC to power the unit instead?
A: The 110v AC refers to the operating voltage of the input and outputs modules only. This should
be matched to the operating voltage of ancillary equipment like valves and switches etc. All
Hydro-Control VI units require a 24v DC power supply.
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Q: The LCD screen has lines running through it. Can I replace the screen without sending the unit
back to Hydronix?
Frequently Asked Questions
Hydro-Control VI Operators Guide HD0456 Rev 1.7.1 75