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EU declaration conformity
Fan speed controller | smoke extraction function | 3,5 A
Product description
Fan speed controller with five steps and smoke evacuation feature. It controls single-phase motors. The maximum (combined) motor current, is 3,5 A.
The rotary switch may be used to choose the necessary AC fan speed. There are five speed settings and an OFF position on this rotary switch. A perfectly sinusoidal output voltage ensures silent motor running
Immediately upon activating the emergency switch, the motor will begin to accelerate to its maximum speed. .
The enclosure provides IP54 protection against moisture, dust, and dirt infiltration. It is suitable for indoor wall mounting.
Additional specifications and description
About transformer technology
Transformer technology is a fundamental aspect of electrical power systems that involves the efficient transfer of electrical energy between different voltage levels. Transformers are static devices that are widely used for voltage conversion, impedance matching, and electrical isolation in various applications, including power transmission, distribution, and utilization.
One of the primary functions of a transformer is voltage transformation. By varying the number of turns in the primary and secondary windings, transformers can step up (increase) or step down (decrease) the voltage level. This allows for efficient transmission of electrical power at high voltages over long distances and safe utilization at lower voltages in homes, businesses, and industrial settings.
Motor type
The SER-1 series of transformer fan speed controllers is intended for monophasic voltage controllable AC fans by reducing the motor voltage. AC fans operate using alternating current and convert it into mechanical power. That is why they are compatible only with voltage controllable motors. It is possible to connect multiple motors to the controller, provided that the current limit is not exceeded. In such cases, all connected motors will operate at the same speed. If you are uncertain about the type of motor you have, it is strongly recommended to carefully review the accompanying documentation or contact the motor manufacturer for further assistance.
Control method
You can select one of the 5 speeds via the built-in switch. Autotransformer technology is used to reduce the motor voltage and the fan speed in 5 steps. It is important that you do not operate the rotary switch too quickly. The switch has a built-in mechanical time delay. This is important to prevent internal sparking during switching. Rapid rotation of the switch can bypass this time delay mechanism. In such cases, the device will remain internally in the "0" position (OFF position) even though the switch has been turned to a different speed setting.
This series features the option to easily change the 5 output voltages by changing the internal wiring. The factory connected output voltages 80, 110, 140, 170, and 230 VAC however, the product version features 190 VAC, which can be connected by disconnecting any of the other 5 steps. The wires are different colours and it is unlikely to make a mistake.
The most special feature of the series, however, is its smoke evacuation button. As standard it is easily accessible on the enclosure of the controller and is pressed in case of emergency when immediate action is required to stop operations or activate safety measures. Pressing the mushroom button would trigger a predefined emergency response – the fan will start running at maximum speed in order to extract the heat and smoke generated during a fire.
If it wasn’t for this emergency button, the series is the same as Sentera’s STR-1 transformer controllers. What is more, the SER-1 series also features normally open contact for external remote button to switch the motor to maximum speed (smoke evacuation).
This makes the SER-1 controllers especially suitable for commercial buildings, industrial facilities, kitchens, tunnels, and other structures where fire safety is a concern and immediate action is required to stop operations or activate safety measures.
Surface mount enclosure
Enclosures play an important role in protecting the interior components or contents from various external factors such as debris, dust, water, and mechanical impact. The quality of enclosures is indeed essential to ensure the integrity and safety of the enclosed items. Therefore, the enclosure of the SER-1 series is manufactured in-house. We use high-quality r-ABS VO (UL94) plastic. This material is flame extinguishing, very tough and offers good protection against impacts. It offers an IP54 protection against ingress dust and water. This fan speed controller can be installed on a wall or panel indoors.
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