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7 - FAULTS
When the PLC detects an issue, it triggers a fault.
7.1 - Type of faults
Faults may either be "maintenance" or "danger" type faults.
"Maintenance" faults are information provided to the user and signal that the unit is not operating correctly, but that this does not have
any immediate consequences (a fouled filter, for example). These may be cleared once the issue has been resolved.
"Danger" faults are issues which prevent the unit from operating; the unit will shut down immediately (or after the fan delay).
The issue must be resolved before the unit can be restarted. The faults may be cleared once the AHU has been shut down and the
fault has disappeared.
"Maintenance" faults may be configured as "danger" faults using parameters P600 to P653. Conversely, for safety reasons, it is not
possible to configure "danger" faults as "maintenance" faults.
7.2 - Fault relays
The PLC contains a "maintenance" faults summary relay and a "danger" faults summary relay. These are 250V AC / 1A type relays.
They are tripped when at least one "maintenance" or "danger" fault, respectively, is present.
Their direction of action is configurable (P880 and P881).
7.3 - Fault memory
The PLC stores the last 100 faults and the date and time that each of these faults occurred. This is the "fault memory" menu.
This memory cannot be cleared.
7.4 - List of faults
No. Designation of faults
1
Powered down
2
Fire protection
4
Frost protection
11
Intake EC motor
31
Exhaust EC motor
48
Intake air flow low limit
49
Extraction air flow low limit
52
Air intake filter 1 fouled
53
Intake filter 1 blocked
58
Exhaust filter 1 fouled
59
Extraction filter 1 blocked
62
Intake filter pressure sensor fault
63
Exhaust filter pressure sensor fault
65
Rotary heat exchanger
66
Heat recovery frosted
71
Electric heater safety thermostat
80
Intake duct pressure too low
81
Intake duct pressure too high
46
Fault level
No. Designation of faults
-
82 Supply air temperature too low
83 Supply air temperature too high
Danger
84 Return temperature too low
Danger
85 Return temperature too high
Danger
86 Room temperature too low
Danger
87 Room temperature too high
Danger
90 Fresh air temperature sensor
91 Supply air temperature sensor
Danger
92 Return air temperature sensor
Maintenance
93 Room air temperature sensor
Danger
94 Intake flow rate pressure sensor
Maintenance
95 Exhaust flow rate pressure sensor
Danger
Loss of communication with the heat recovery
141
unit outlet temperature sensor, intake side
Danger
150 Loss of communication with Th-Tune
Danger
151 Coil 1 pump fault
Maintenance
152 Coil 2 pump fault
153 Heat recovery unit pressure sensor fault
Danger
154 Additional casing supply air sensor fault
Maintenance
155 Exhaust duct pressure too low
Maintenance
156 Exhaust duct pressure too high
Maintenance
Fault level
Maintenance
Maintenance
Maintenance
Maintenance
Maintenance
Maintenance
Danger
Danger
Danger
Maintenance
Danger
Danger
Maintenance
Maintenance
Maintenance
Maintenance
Danger
Danger
Maintenance
Maintenance
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