EU declaration conformity
Fan speed controller 400 V | day-night function | 1,5 A
This is a two-speed controller with thermal contacts (TK) for 400 V motors. The maximum motor current (combined) is 1.5 A.
This controller has two distinct 5-step switches for selecting between two ideal fan speeds. When the motor is turned on, a dry contact input may be used to switch between the two speeds.
In the event of overheating, the TK monitoring feature shuts the motor. The motor will automatically resume after a power outage.
The alarm and unregulated outputs can be used to operate external devices in order to produce alerts or validate normal operation.
The fan speed is controlled by lowering the motor voltage using autotransformers. This method produces an output voltage with a perfect sinusoidal form, ensuring silent motor running.
The enclosure is surface mountable and provides IP54 protection against dirt, dust, and moisture entry.
Additional specifications and description
The SC2A4 is designed to control 400 V, three-phase fans using autotransformer technology. The series uses two separate 5-step rotary switches to select two optimal fan speeds. These speeds can be selected for different scenarios, such as high speed during the day and low speed during the night. A dry contact input is used to switch between the selected speeds when the motor is active. For instance, an external clock can trigger the switch to high speed during the day and low speed during the night.
The fan motor can be remotely enabled or disabled using two inputs: normally open and normally closed. When a remote switch is connected to the normally open input, it can enable or disable the motor. Similarly, a smoke alarm connected to the normally closed input will disable the motor in case of a smoke alarm event. This provides flexibility in controlling the fan motor from a distance.
The controller has an additional unregulated output (single phase, 230 VAC) that becomes active when the motor is enabled. This output can be utilized to control external devices, such as operation indicators or dampers. For example, when the fan motor is deactivated, the damper can be closed, and when the fan motor is active, the damper can be opened.
Thermal motor protection
The controller can monitor thermal motor contacts (TK) that measure the temperature in the motor windings. If the motor overheats, the TK monitoring function will disable the motor to prevent damage. If the motor lacks TK contacts, the controller's TK terminals must be bridged to simulate normal motor temperature.
An alarm output (230 VAC, 1 A) is activated in case of motor problems, such as overheating. This output can generate alerts or control warning indications. If the motor overheats, the TK monitoring function will disable the motor to prevent further damage.
Auto reset after power failure
In the event of a power failure, the controller will automatically reset itself. When power is restored, the fan motor will restart automatically. This ensures that the system continues to operate seamlessly after power disruptions.
When connecting the cables for a three-phase fan motor, adhering to the specific instructions to ensure proper connections and safe operation is a must.
In the first place, you should identify the motor leads. In most cases, three-phase motors have six leads that are labeled as U, V, and W, representing the three phases. These leads serve as the outputs to the motor, while the controller is powered using the R, S, and T terminals.
To determine the appropriate wiring configuration, you should refer to the motor nameplate or specifications. Specifically, check the voltage rating of the motor and ensure that it matches the available power supply voltage.
Depending on the motor voltage and the available power supply, it may be necessary to wire the motor in either a delta (Δ) or a wye (Y) configuration. The motor nameplate or the manufacturer's documentation should provide guidance on the suitable wiring configuration for your specific motor model.
Also, it is important to adhere to the grounding guidelines outlined in the local electrical codes. Typically, three-phase motors require proper grounding for safety purposes.
By following these guidelines, you can ensure that the wiring for your three-phase fan motor is correctly executed and that safe operation is achieved.
The series features sheet steel enclosures designed to be resistant to external mechanical impacts. They can withstand accidental bumps, collisions, or other physical forces without compromising their structure or the items inside. This feature is particularly important in environments where there is a higher risk of such impacts, ensuring the protection of the enclosed components. The enclosures have a paint finish, which not only provides an aesthetic appeal but also serves as an extra layer of protection against corrosion and other environmental factors. The paint finish helps to enhance the durability and longevity of the enclosure. The enclosure is EN 62208 certified and designed for surface mounting. It offers an IP54 protection rating, guarding against the ingress of dirt, dust, and moisture.