Airtec RO Plus l - Page 111

111
11. Troubleshooting
Alarm: Pressure
Fault
code: Cause Solution
1901
Defect pressure transmitter. Feedback signal from transmitter is
higher than the actual pressure.
• Stop the system, and compare inlet pressure, pressure from RO if
installed, or direct from manometer on filter house. Compare with
value from transmitter on display. System page.
• Try and do a start on one zone to see if pressure is slowly building up
to 50 bars and stays.
• If not, change the pressure transmitter.
1902
By-pass valve adjusted too high or by-pass is defect. If pressure
goes above 70 bar for more than 10 sec. or 80 bar in 0,1 sec. then
the system will shut down all zones.
• Loosen the by-pass 1-2 turns and redo by-pass adjustment. Follow
guideline in system startup.
• Unable to adjust the by-pass, replace the by-pass valve.
Alarm: Fault on inverter
Fault
code: Cause Solution
1801
Inverter in alarm. On the freq. inverter the red fault light is ON. • Follow the troubleshooter guide to inverter from the fault code in
Inverter display.
Alarm: Modbus Fault
Fault
code: Cause Solution
1701
2
nd
plc has been activated, but is not installed. • For systems with less than 5 zones humidity control or 3 zones
humidity/temp control or less than 3 AHU, no second plc is installed.
1702
Freq. inverter has been without power or still is without power. • Turn the fuses back on, and try and press reset. If you cannot reset,
see 1703.
1703
Modbus plug on freq. inverter not inserted right. • Check connection with the electric diagram. That 485+/- is inserted
the right way in both ends.
1704
Modbus cable or end resistance not connected the right way. • See 1703.
1705
Modbus cable 485+ and – is installed opposite in minimum one
connection.
• See 1703.
1706
PLC defect. PLC fault LED is on, and it will not reset after a power
cycle.
• New PLC is needed. Contact Airtec with system number, to get right
PLC and software supplied.
2
nd
PLC
201218