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7.3 TYPE 3: ALARM REPORT DURING REFERENCE PRESSURE INITIALIZATION
- Conditions:
• Mode Airflow control or Demand control: during the initialization of the pressure alarm.
• Mode Pressure control: during the initialization of the pressure reference via airflow
- Causes:
The reference pressure (Paref) cannot be identified and the fans are stopped. 4 possibilities:
1. Actual airflow < requested airflow: The requested working point is 'too high' (too high pressure loss)
for the maximal available pressure at the requested airflow for this fan.
2. Actual airflow > requested airflow: the nominal airflow requested to initialize the pressure alarm
cannot be reached because the lower limit of the fan's operating zone has been reached.
3. Very unstable pressure (pumping).
4. Assigned airflow not reached after 3 minutes.
If this occurs during initializing an alarm pressure, there are 2 options:
1. No action is taken: the control will operate without a pressure alarm.
2. Corrective action is taken (change the working point to one located in the working
zone of the fan, by reducing the pressure system, modifying the nominal airflow...) and restart the setup operation.
If this occurs during initializing of the assignment pressure in pressure control mode: Corrective action must be taken
(change the working point to one located in the working zone of the fan, by reducing the pressure system,
modifying the nominal airflow ...) and restart the setup operation.
- Effects:
Displayed on HMI TACtouch
Text displayed
P.20
Initialisation of the reference pressure - Unstable supply air pressure
P.21
Initialisation of the reference pressure - Unstable extract air pressure
P.22
Initialisation of the reference pressure - Supply air flow too low
P.23
Initialisation of the reference pressure - Extract air flow too low
P.24
Initialisation of the reference pressure - Supply air flow not reached
P.25
Initialisation of the reference pressure - Extract air flow not reached
P.26
Initialisation of the reference pressure - Supply air flow too high - Min. limit of the motor
P.27
Initialisation of the reference pressure - Extract air flow too high - Min. limit of the motor
AL1 relay
O.R.1
ALARM
/
30
LED ALARM
RED
TAC control board
LED ALARM
LED AF
ON
/
Auto reset: no
Operation and maintenance
instructions – CLASS UNIT TAC5
7.4 TYPE 4: ALARM INDICATING THE SYSTEM CANNOT FULFIL THE SETPOINT
- Conditions:
- Causes:
• The setpoint cannot be fulfilled because the upper or lower limit of the fan's working zone has been reached
- Effects:
S.11
S.12
S.13
S.14
S.20
S.21
S.22
S.23
S.24
S.25
S.34
S.35
AL1 relay
LED Pa
7.5 TYPE 5: ALARM INDICATING A DATA FAILURE IN THE CONTROL CIRCUIT
- Conditions:
/
- Causes:
• Crucial data from the circuit board has been lost
- Effects:
D.10
Fans
D.20
Stopped
AL1 relay
Alarm status
- Solutions:
• Try a TOTAL RESET of the data using the advanced setup. If still not resolved, order a new circuit board.
Operation and maintenance
Displayed on HMI TACtouch
Text displayed
"Constant Pressure" fan 1 - Measured pressure too high - Minimum air flow reached
"Constant Pressure" fan 1 - Measured pressure too low - Maximum air flow reached
"Constant Pressure" fan 3 - Measured pressure too high - Minimum air flow reached
"Constant Pressure" fan 3 - Measured pressure too low - Maximum air flow reached
"Demand control" fan 1 - Air flow too low - Reduce the pressure on this fan
"Demand control" fan 1 - Air flow too high - Minimum limit of the motor reached
"Demand control" fan 2 - Air flow too low - Reduce the pressure on this fan
"Demand control" fan 2 - Air flow too high - Minimum limit of the motor reached
"Demand control" fan 3 - Air flow too low - Reduce the pressure on this fan
"Demand control" fan 3 - Air flow too high - Minimum limit of the motor reached
"Constant Air Flow" fan 3 - Air flow too low - Reduce the pressure on this fan
"Constant Air Flow" fan 3 - Air flow too high - Minimum limit of the motor reached
TAC control board
O.R.1
LED ALARM
/
/
ON
Auto reset: yes
Displayed on HMI TACtouch
Text displayed
Programme Error
Data Error
TAC control board
O.R.1
LED ALARM
/
ON
Auto reset: no
instructions – CLASS UNIT TAC5
LED ALARM
LED Pa
RED
/
LED AF
Fans
/
/
LED ALARM
LED Pa
RED
/
LED AF
Fans
/
Stopped
31
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