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- 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).
7. check the stepper driver:
7.1
Check previous wire from control board DO2 is well connected to «PWM1» input.
7.2
Check +24V DC at GND +24V connectors of stepper driver. If not, check the 24V DC power supply and the
cable between it and the driver.
7.3
check electrical connection between driver and motor.
7.4
if the red led is blinking on stepper driver, that means that there is an alarm.
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
If not, it must be connected, and it is safer to replace the stepper driver and the control board.
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.
54
Operation and maintenance instructions
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