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5.2 Controllers
The ECM motor controller controls this motor according to an adjusting potentiometer on the controller, an
external 0-10V signal or a set point given by Modbus BMS .
The Modbus BMS connection, present as standard, allows you to adjust the flow rate set point or pressure,
and to read the controller registers to find out the state of the roof fan.
5.2.1 Controller terminal block
Unscrew the plate on the front of the controller (Torx
T20 screwdriver).
5.2.2 Adjustment potentiometer
Adjustment potentiometer
5.2.3 Fault correction
In the event of a fault, restarting operation after switching off the power for 5 minutes may allow the con
-
troller to reset. A fault relay allows us to identify the main causes of faults on the controller.
Connection of the relay:
For sizes 355/400/450:
Controller - Terminals 4, 5, 6.
For sizes 500/630/710:
Controller - Terminals 17, 18, 19.
Regardless of the principle of operation of the roof fan, the relay operates in the following manner:
STATE OF THE UNIT
State of
the relay**
Compacto
Invento
"Normal" operation (COP, CAV, VAV)
NO
5-6
18-19
Supply cut off
NC
4-5
17-18
On / Off switch open - the wheel is stationary but power is on to the controller.
NC
4-5
17-18
Loss of phases* - possibility that during a loss of phase the wheel continues to turn.
NC
4-5
17-18
*If the control unit detects a fault more than once, notably a phase problem twice, the roof fan will not restart automatically. (**)
NO.: normally open, NC: normally closed.
Switch off the power supply for 5 min and restart the roof fan. If the problem persists, it is possible to
identify the nature of the problem in the registers of the Modbus. The controller operating manual is avail-
able for more information on www.vim.fr.
