Control - Vents VKM User Manual

The TW1, TW2 terminals are the electrical leads of the normally closed contact of the motor overheating
protection. Connect the contact in series to power circuit of the magnetic starter coil KM1 that starts the motor
after pressing the S1 button. In case of pressing the S2 button or motor overheating the contact gets broken
and switches the starter coil off to cut power off and stop the motor. The QF circuit breaker, the magnetic
starter KM1, the control knobs S1 and S2 are not included in the delivery and must be installed by the user.
The motor connection example with thermal protecting contacts leaded outside are shown in Fig. 12.
The electronic module is designed for smooth control of fan speed (air flow). The speed is controlled with
the speed control knob 9 (Fig. 5).
The VKM Un, VKMz Un fans with a temperature and speed controller
The controller is designed for air temperature control and fan speed control depending on ambient air
temperature.
The speed is controlled with the speed control knob 9 and the temperature control knob 10 (Fig. 5).
The VKM Un, VKMz Un fans are equipped with an external temperature sensor fixed on a 4 m cable.
The cover of the terminal box incorporates the following controls:
speed control knob 9 (Fig. 5)
temperature controller 10 (Fig. 5) to set the thermostat temperature threshold
on/off LED light indicator 11 (Fig. 5)
thermostat LED light indicator 12 (Fig. 5)
Set the thermostat temperature threshold with a thermostat control knob 10. Turn on the fan, then set the
fan speed with the speed control knob 9. The fan on/off light indicator 11 lights up. The controller switches the
fan to the maximum speed (maximum air flow) as the temperature rises and crosses the thermostat setpoint.
The thermostat light indicator 12 glows if the temperature is above the thermostat setpoint. If the temperature
falls 2 °C below the thermostat setpoint, the fan reverts to the preset lower speed. This prevents frequent speed
changeovers during operation with the temperature close to the threshold value. This control logic enables
tracking temperature fluctuations and respond to the temperature change with accuracy up to 2 °C. The rate
of the speed switching depends exclusively on the air temperature fluctuations.
V05EN-07.indd 15
~230 V
50 Hz
Fig. 12
The VKM P, VKMz P fans with a built-in electronic module
Operation algorithm of the VKM Un and VKMz Un fans

CONTROL

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28.04.2016 16:22:24