Additional specifications and description
What is a transformer controller?
A transformer controller regulates fan speed in steps by reducing the motor voltage. This is done via autotransformers. This technology is very reliable and robust. It generates a motor voltage with a perfect sinusoidal shape. This technology guarantees a quiet motor operation and an extended service life. A special impregnated coating reduces the electrical noise of the autotransformers.
0-10 V control signal
One of the available fan speed levels can be selected via the 0-10 V input signal. If there is no 0-10 V signal available, an external potentiometer can be connected to the STVS4 controller. The MTP-X10K-NA potentiometer can be connected to the 12 VDC supply of the STVS4 controller.
E.g. input signal 2 V activates speed level 1 (130 VAC to the motor), input signal 4 V activates speed level 2 (180 VAC to the motor), etc.
Thermal motor protection
This fan speed controller can monitor thermal motor contacts (TK or thermal contacts measure temperature in the motor windings). In case of motor overheating, the TK monitoring function will disable the motor to prevent motor damage. If the motor is not equipped with TK contacts, both TK terminals of the controller must be bridged to simulate normal motor temperature.
Auto reset after power failure
In case of a power failure, this controller will automatically reset itself. When the power is restored, the motor will restart automatically.
The extra, unregulated output (230 VAC) is active when the motor is enabled. It can be used to control an external run-indicator, a damper, etc.
E.g. when the fan is deactivated, the dampers is closed. When the fan is active, the damper is open.
The enclosure is made of high-quality steel. The enclosure can be surface mounted and offers an IP54 protection against ingress of dirt, dust and moisture.