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List of Failures (HMI-SG controller)
Failure
Description
Reduced humidifi-
cation output
Auxiliary Fan
Auxiliary Fan - twin
Backup fans
in the inlet
Backup fans
in the outlet
Communica-
tion, Modbus
Process com-
munication KNX
Room unit 1 -
Temperature
Room unit 2 -
Temperature
Outdoor tem-
perature
Room temperature
Outlet tem-
perature
Inlet temperature
difference
Room tempera-
ture difference
44
Reduced humidification output due to the temperature priority (swimming-pool unit)
B
10
– an information message.
1.) Communication error between control unit and the auxiliary fan frequency inverter
(Modbus data bus) – inverter internal error; wrong settings of the frequency inverter data
points – bus communication protocol, data transfer rate, parity, number of stop-bits, com-
B
15
munication timeout; poor connection of the bus cable to the frequency inverter terminals;
bus terminal resistance settings on the last frequency inverter has not been performed.
2.) Auxiliary fan failure (Modbus data bus) - thermo-contact, flow sensor
1.) Communication error between control unit and the auxiliary fan twin frequency inverter
(Modbus data bus) – inverter internal error; wrong settings of the frequency inverter data
points - bus communication protocol, data transfer rate, parity, number of stop-bits, com-
B
16
munication timeout; poor connection of the bus cable to the frequency inverter terminals;
bus terminal resistance settings on the last frequency inverter has not been performed.
2.) Auxiliary fan twin failure (Modbus data bus) - thermo-contact, flow sensor
Main inlet fan failure (backup fan activated) - thermo-contact, flow sensor
B
18
A Class failure – inlet backup fan shutdown
Main outlet fan failure (backup fan activated) - thermo-contact, flow sensor
B
19
A Class failure - outlet backup fan shutdown
Communication error between control unit and the fan or ROV frequency inverter (Modbus
data bus) - inverter internal error; wrong settings of the frequency inverter data points
B
23
– bus communication protocol, data transfer rate, parity, number of stop-bits, commu-
nication timeout; poor connection of the bus cable to the frequency inverter terminals;
bus terminal resistance settings on the last frequency inverter has not been performed.
B
23
Communication error between control unit and HMI-SG controller (KNX bus)
B
24
Disconnected or damaged HMI-SG1 controller
B
24
1) Disconnected or damaged HMI-SG2 controller
2) Wrong HMI-SG2 controller communication address setting (the same address with
the HMI-SG1 controller)
B
25
Disconnected or damaged outdoor temperature sensor
B
26
Disconnected or damaged room temperature sensor
B
28
Disconnected or damaged outlet temperature sensor
Information message on the difference between inlet and required temperatures, provid-
ing the Inlet and Required Temperature Difference Monitoring has been activated (in the
B
32
data point 201). If the temperature difference is higher than pre-set Maximum Difference
(data point 801) or if the inlet temperature drops below the pre-set minimum threshold
(data point 803), an information message is displayed.
Information message on the difference between room/outlet and required temperatures,
providing the Inlet and Required Temperature Difference Monitoring has been activated
B
33
(in the data point 201). If the temperature difference is higher than pre-set Maximum
Difference (data point 807) or if the room/outlet temperature drops below the pre-set
minimum threshold (data point 809), an information message is displayed.
Failure Causes
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