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EU declaration conformity
AC fan speed controller | TK monitoring | remote on-off | 5 A
Product description
The Sentera ITRS9-50-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 ITRS9-50-DT model, with a maximum motor current of 5,0A, features an illuminated on/off switch, LED indications for quick diagnostics, and an alarm output for timely issue alerts.
In summary, the ITRS9-50-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
By reducing the motor voltage, this fan speed controller can regulate the speed of single phase AC motors. The controller reduces the motor voltage 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 rotary knob on the front of the enclosure. Some motor types might have a humming motor noise occur at low speed.
Adjustable minimum and maximum motor speed
Via the two internal trimmers, the minimum and maximum selectable motor speed can be adjusted. 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 that might occur can be compensated. Setting the minimum speed sufficiently high may prevent motor overheating at prolonged low speed. Consult the motor manufacturer to find out what speed range is best for your motor.
Thermal motor protection
A typical reason why AC motors fail is overheating. In order to detect motor overheating in time, some motors are equipped with TK, or thermal contacts in full. These thermal contacts measure the temperature in the motor windings. ITR9S fan speed controllers can monitor thermal motor contacts. If the motor were to overheat, the TK monitoring function will disable the motor and 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 your motor is not equipped with TK contacts, bridge both TK terminals of the ITRS9 controller to simulate a continously normal motor temperature.
How to start up the AC fan?
With the two inputs, the motor can start or stop remotely. 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 motor startup modes: Kick start or soft start acceleration. The modes can be selected via an internal jumper. Kick start will start the motor at maximum speed. After about 8 – 10 seconds, the motor will decelerate towards the desired fan speed. Soft start 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. 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), this output 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 indoors, on a wall or on a panel. Make sure that the fan speed controller can sufficiently cool . Preferably install it in a cool place, best away from sunlight. 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 the ingress of dust and water.
By reducing the motor voltage, this fan speed controller can regulate the speed of single phase AC motors. The controller reduces the motor voltage 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 rotary knob on the front of the enclosure. Some motor types might have a humming motor noise occur at low speed.
Adjustable minimum and maximum motor speed
Via the two internal trimmers, the minimum and maximum selectable motor speed can be adjusted. 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 that might occur can be compensated. Setting the minimum speed sufficiently high may prevent motor overheating at prolonged low speed. Consult the motor manufacturer to find out what speed range is best for your motor.
Thermal motor protection
A typical reason why AC motors fail is overheating. In order to detect motor overheating in time, some motors are equipped with TK, or thermal contacts in full. These thermal contacts measure the temperature in the motor windings. ITR9S fan speed controllers can monitor thermal motor contacts. If the motor were to overheat, the TK monitoring function will disable the motor and 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 your motor is not equipped with TK contacts, bridge both TK terminals of the ITRS9 controller to simulate a continously normal motor temperature.
How to start up the AC fan?
With the two inputs, the motor can start or stop remotely. 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 motor startup modes: Kick start or soft start acceleration. The modes can be selected via an internal jumper. Kick start will start the motor at maximum speed. After about 8 – 10 seconds, the motor will decelerate towards the desired fan speed. Soft start 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. 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), this output 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 indoors, on a wall or on a panel. Make sure that the fan speed controller can sufficiently cool . Preferably install it in a cool place, best away from sunlight. 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 the ingress of dust and water.
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