Swegon ESENSA PX TOP Operation & Maintenance Instructions Manual page 14

6.14 TYPE 14: ALARM INDICATING FROST PROTECTION ALERT – FANS STOPPED T°
- Conditions:
• PX units with
- electrical preheating (KWin) or hydraulic preheating (BAin)
- or modulating bypass configured in antifrost modality.
- or antifrost protection with supply air flow reduction
- Causes:
• With KWin or BAin option - associated alarm code: A.11 : in certain air T° conditions as measured on the exhaust airflow after
the heat recovery, indicating that the internal electrical KWin coil or external hydraulic coil (BAin) has reached its limit, the
TAC control can take over to guarantee the anti-frost function.
If T° < -5°C during 5 minutes, fans are stopped.
• With modulating bypass - associated alarm code: A.11: in frost protection (« A-FREEZE » or « AF+FREECOOL » in the
advanced setup), this alarm indicates that the exhaust air temperature at the exchanger output (T3 sensor) has not
exceeded 1°C during 15 minutes after that the bypass has been opened at 100%.
• With antifrost protection with supply air flow reduction - associated alarm code: A.22: when the exhaust air temperature at
the exchanger output (T3 sensor) falls under 1°C (configurable advanced parameter), the supply fan is stopped and it will turn
again if T3 becomes greater than 2°C for more than 5 minutes. This additional protection can be disabled in the advanced
setup.
- Effects:
Displayed on HMI TACtouch
Code
A.11 Pre-heating - Off
A.22 Anti-freeze - Fans stopped
TAC control board
ALARM OUTPUT AL dPa OUTPUT
Alarm status /
Manual reset mandatory.
* A.22: only supply fan is stopped
6.15 TYPE 14 BIS: ALARM INDICATING AN ERROR ON THE HEAT EXCHANGER ROTATION SPEED
- Conditions:
• Only for RX units
- Causes:
• This alarm indicates that the rotation speed of the wheel has been lower or greater than 15% of the setpoint
speed for more than 5 minutes
- Effects:
Displayed on HMI TACtouch
Code
B.30 Speed of rotation of the exchanger incorrect
TAC control board
ALARM OUTPUT AL dPa OUTPUT
Alarm status /
Manual reset mandatory.
26 www.swegon.com
GB.ESENSA.MO.231025
Text displayed
LED ALARM Fans
ON Stopped*
Text displayed
LED ALARM Fans
ON Stopped
We reserve the right to alter specifications.
- Diagnostic:
A – Visual mechanical check :
1. Check good tension of the green rubber belt in the central part of the unit. Eventually replaced if broken.
2. Check the good coupling between motor shaft and pulley: eventually screw the 2 screws.
3. Check that the wires of the motor are not damaged (8 wires: red, red-white, black, black-white, green, green-white,
yellow, yellow-white).
B – Further diagnostic
1. Ensure that the control board TAC is at last version available on web site.
2. Check the current RPM of the rotor respect to the setpoint which is in normal condition (no freecooling and no antifrost
protection), 10 RPM.
3. If the actual speed is lower than 9,8 RPM (but >0), then decrease parameter "rotor speed at 10V" in product settings
until that the actual speed is between 9,8 and 10,2 RPM.
4. If the actual speed is higher than 10,2 RPM, then increase parameter "rotor speed at 10V" in product settings until that
the actual speed is between 9,8 and 10,2 RPM.
5. Feedback of rotor: check input for rotor speed (see wiring diagram at point 4): closed when magnet on the rotor in
front of magnetic switch. Otherwise, open.
5.1. If not, check directly the impedance at the sensor output: if 0 Ohm when magnet in front and infinite when far,
then the sensor is correct and the control board has to be replaced. Otherwise, replace magnetic sensor.
6. Output rotor speed control from TAC main board: check that the wire from DO2 goes well to stepper driver PWM1 input
(see following point).
Level
3
7. check the stepper driver:
3
7.1
7.2
cable between it and the driver.
7.3
7.4
Check first of all that the support of the stepper motor is well connected to the rotor frame with a yellow green
protective earth cable.
7.4.1
7.4.2 If yes, try with another driver. If it still blink, try with another motor.
N.B.: when the stepper driver is replaced, dip switch have to be placed on same position than before. Only DIP SWITCH 1
has effect and it is used for the direction of rotation.
Level
3
We reserve the right to alter specifications.
Check previous wire from control board DO2 is well connected to «PWM1» input.
Check +24V DC at GND +24V connectors of stepper driver. If not, check the 24V DC power supply and the
check electrical connection between driver and motor.
if the red led is blinking on stepper driver, that means that there is an alarm.
If not, it must be connected, and it is safer to replace the stepper driver and the control board.
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