Troubleshooting - Swegon CLASS UNIT Operation & Maintenance Instructions Manual

7.0 Troubleshooting

The TAC control board generates and reports 18 types of alarms.
The alarms are subdivided into auto resetting and non-auto resetting alarms. For the latter, a reset will be
necessary once the problem has been resolved.
For each type of alarm, a full text description will be displayed on the user interface depending on the alarm type:
- Activation of contact relay (NC or NO contact)- AL 1
- Activation of SAT3 OR1 in case of pressure alarm, provided that the optional module SAT 3 is installed on the control board.
- "Alarm", "Pa" and "AF" activated LED's on control board
- Alarm on user interface.
- Alarm communication with networking modules provided that an optional communication module
(Modbus RTU, MODBUS TCP/IP, and KNX) is installed on the TAC control board.
7.1 TYPE 1: ALARM INDICATING A FAN FAILURE
- Conditions:
- Causes:
• Failure of fan Fx. This problem is usually caused by the fan motor.
If not, the failure may be caused by an internal cable (control or power) or by the TAC circuit.
- Effects:
B.11
B.12
B.13
B.14
AL1 relay
Alarm
30
Displayed on HMI TACtouch
Text displayed
Fan 1 failure
Fan 2 failure
Fan 3 failure
Fan 4 failure
TAC control board
O.R.1 LED ALARM
/
Auto reset: yes
LED AF
ON
Operation and maintenance
LED ALARM
RED
Fans
/ stopped
instructions – CLASS UNIT TAC5
LED Pa
/