.webp "AC fan speed drive")
.webp "fan speed drive")
.webp "AC motor variable speed drive")
.webp "fan speed drive with built-in potentiometer")
.webp "HVAC fan speed drive")
.webp "Single phase AC motor fan speed drive")
EU declaration conformity
AC fan speed controller | TK monitoring | remote on-off | 1,5A
Product description
The Sentera ITRS9-15-DT fan speed controller, part of the ITRS9 series, efficiently regulates single-phase voltage controllable motors (110—240 VAC / 50—60 Hz) by adjusting the supplied voltage. The adjustable stepless output voltage enables precise fan speed control for optimal performance Offering automatic power supply detection, thermal contacts (TK) for motor protection, and open (NO) and closed (NC) inputs for remote start/stop, the controller ensures versatile and safe operation.
Internally adjustable via trimmers, the ITRS9 controllers set minimum and maximum speeds. The series incorporates an unregulated output for devices like valves, lamps, or dampers, regulated by a potentiometer within the range of minimum output voltage to the supply voltage.
Equipped with kick-start and soft start modes, selectable via a jumper, the controller provides flexibility in motor acceleration. The ITRS9-15-DT model, with a maximum motor current of 1.5A, features an illuminated on/off switch, LED indications for quick diagnostics, and an alarm output for timely issue alerts.
The ITRS9-15-DT offers precise speed control, safety features, and flexibility, making it an ideal choice for HVAC systems.
Additional specifications and description
Continuous variable speed control
This fan speed controller regulates the speed of single phase AC motors by reducing the motor voltage. The motor voltage is reduced via phase angle control (TRIAC technology). This means that this speed controller is only suitable for voltage controllable motors. If you are not sure whether your motor is voltage controllable, it is best to contact the motor manufacturer. This speed controller works completely silently. The fan speed can be set via the knob on the front panel. Depending on the motor type, a humming motor noise may occur at low speed.
Adjustable minimum and maximum motor speed
The minimum and maximum selectable motor speed can be adjusted via two internal trimmers. This makes it possible to optimize the speed range that can be selected via the knob on the front panel. By optimizing the speed range, any overcapacity of the fan can be compensated. By setting the minimum speed sufficiently high, motor overheating at prolonged low speed can be prevented. Consult the motor manufacturer to find out what speed range is allowed for your motor.
Thermal motor protection
When an AC motor fails, it is often due to overheating. In order to detect motor overheating in time, some motors are equipped with TK or thermal contacts. These thermal contacts measure temperature in the motor windings. ITR9S fan speed controllers can monitor thermal motor contacts. In case of motor overheating, the TK monitoring function will disable the motor to prevent permanent motor damage. In this case, the alarm output will be activated. E.g.: an external buzzer or an external indicator light can be connected to the alarm output to signal motor problems. If the motor is not equipped with TK contacts, bridge both TK terminals of the ITRS9 controller to simulate normal motor temperature.
How to start up the AC fan?
The two inputs can be used to remotely start or stop the motor. It is for example possible to connect a remote switch or an external clock to one of both inputs to start the motor. There are two different methods to start the motor: Kickstart or softstart acceleration. They can be selected via an internal jumper. Kickstart will start the motor at maximum speed. After 8 – 10 seconds, the motor will decelerate towards the requested fan speed. Softstart will smoothly accelerate the motor from standstill towards the requested fan speed. This acceleration time will be approximately 8 – 10 seconds.
ON/OFF switch
With the illuminated ON/OFF switch on the side, the device can be switched on or off. In ON position, the switch is illuminated. For the 1,5 A and 3 A ITR-9 series, the ON-OFF switch can be disabled if desired. To disable the ON/OFF switch, connect the power supply via terminals L1 and N (not via L and N). Please refer to the manual for more details.
Unregulated output
When the motor is enabled, the unregulated output is active. Because this output is either ON (230 Volt) or OFF (0 Volt), it is called ‘unregulated output'. The maximum current of this output is 2 A. It is typically used to control an external run-indicator, a damper, an external relay, etc. E.g. when the fan stops, the damper is closed. When the fan is active, the damper is open.
Waterproof enclosure for indoor applications
This fan speed controller can be installed on a wall or on a panel indoors. Make sure that the fan speed controller can cool sufficiently. Preferably install it in a cool place, best not in the sun. The enclosure is made of 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.
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