45
Operation and maintenance instructions
- Conditions:
•
Mode Airow control or Demand control: during the initialization of the pressure alarm. In this case, the unit must have
forward fans or backward fans with kit CA.
•
Mode Pressure control: during the initialization of the pressure reference via airow.
- Causes:
The reference pressure (Paref) cannot be identied and the fans are stopped. 4 possibilities:
1.
Actual airow < requested airow: The requested working point is ‘too high’ (too high pressure loss)
for the maximal available pressure at the requested airow for this fan.
2.
Actual airow > requested airow: the nominal airow 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 airow not reached aer 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 airow…) 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 airow …) and restart the setup operation.
- Eects:
8.3 TYPE 3: ALARM REPORT DURING REFERENCE PRESSURE INITIALIZATION
TAC control board
ALARM OUTPUT AL dPa OUTPUT LED ALARM Fans
Alarm Status / ON Stopped
Auto reset: no
Displayed on HMI TACtouch
Code Text displayed Level
P. 2 0 Initialisation of the reference pressure - Unstable supply air pressure 2
P. 2 1 Initialisation of the reference pressure - Unstable extract air pressure 2
P. 2 2 Initialisation of the reference pressure - Supply air ow too low 2
P. 2 3 Initialisation of the reference pressure - Extract air ow too low 2
P. 2 4 Initialisation of the reference pressure - Supply air ow not reached 2
P. 2 5 Initialisation of the reference pressure - Extract air ow not reached 2
P. 26 Initialisation of the reference pressure - Supply air ow too high - Min. limit of the motor 2
P. 27 Initialisation of the reference pressure - Extract air ow too high - Min. limit of the motor 2
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