GB.FUNKMIRU.121204
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9. In-operation setting, Miruvent
9.1 AC motor with
integrated frequency inverter, Modbus
Make sure that voltage is being supplied to the safety
switch of the MIRUVENT fan.
Switch on the safety switch of the MIRUVENT fan.
The frequency inverter is now ready to receive control
signals via communication from MIRU Control.
9.2 EC motor, Modbus
Make sure that voltage is being supplied to the safety
switch of the MIRUVENT fan.
Switch on the safety switch of the MIRUVENT fan.
The red and green LED of the motor control system will
flash during start up.
When the red LED stops flashing (only the green LED is
flashing) the fan is ready to be started.
Check that the address selector switch, closest to the LEDs
on the motor control system, are set to 0 resp. 1.
The motor control system is now ready to receive control
signals via communication from MIRU Control.
10. Trouble shooting
10.1 AC motor with
integrated frequency inverter, Modbus
Inside the frequency inverters, there are eight internal
protections that initiate an alarm and stop the power roof
ventilator.
The cause of the alarm can be read on LED 2 inside the
frequency inverter. Remove the screws and bend up the
upper section of the frequency inverter and read the num-
ber of flashes (followed by a longer unlit period).
1 flash
Low supply voltage
2 flashes
High supply voltage
3 flashes
Over current to motor
4 flashes
Over temperature in frequency inverter
5 flashes
Phase failure on supply voltage, phase
lacking
6 flashes
Fluctuating supply voltage between
phases
10 flashes
Communication failure between upper and
lower sections
11 flashes
Memory circuit failure
These defects can be read in the menu on the MIRU Con-
trol panel, for example No. 1 Fan tripped.
To reset alarms.
Switch off the supply voltage to the AC motor and fre-
quency inverter control system so long that the internal
condensers become de-energised (approx. 90 seconds).
10.2 EC motor, Modbus
There are three defects that cause the motor control
system to initiate an alarm and stop the power roof venti-
lator.
WRONG SPEED:
The LED on the motor control system alternately flashes
red and green.
The fan speed is not in agreement with the setpoint for
the fan motor.
One possible cause could be that a power monitor has
registered max. limit motor output. The motor control
system then decreases the fan motor’s speed by 100 rpm
causing the speed to deviate from setpoint.
Another possible cause could be that the wrong size has
been preset under Base Setting in the MIRU Control.
UNDER VOLTAGE:
The LED on the motor control system shines red.
Low voltage in the intermediate level/rectifier.
MOTOR FAILURE:
The LED on the motor control system shines red.
Communication failure with Hall sensors (= position sen-
sors).
To reset alarms.
Alarms can be reset in two ways:
1. By pressing the red reset button on the motor control
system (to the side of the LEDs) and holding it pressed in
for 1 – 2 seconds.
2. By interrupting the supply voltage to the motor control
system so long that the internal condensers become de-
energised and the red and green LED is first lit and then is
off.
