Single-phase thyristor power controller – APR-D

Single-phase power control

Fields of application

Single-phase electric heating for furnaces and industrial machinery; primary-side control of transformers and rectifiers; lighting dimming compatible with phase-angle control.

Benefits

Compact size when stored in a cabinet
Simplified Wiring
Resistive and Inductive Compatibility
Current Limitation (Depending on Version)

Reference: RPDE

Retail price
, depending on configuration 270 €

Discounts available on request

Features
Documentation
Applications

Features

Fuji Electric’s APR-D single-phase thyristor power controller adjusts the power supplied to a load based on a manual or automatic setpoint. When paired with a temperature controller, it controls the power delivered to heating elements. Its versatility also allows it to drive inductive loads and control the primary windings of transformers or rectifiers, depending on operating conditions. Its compact design facilitates the installation of multiple units side by side and reduces the space required in the control cabinet. The integrated digital controls and display functions simplify configuration and operational monitoring. Depending on the version selected, current limiting and regulation capabilities complement the load control functions.

Input	Main circuit	Rated voltage	Single-phase 100/240 V AC
		Frequency	50 Hz/ 60 Hz (automatic identification)
	Control circuit	Feeding capacity	15 VA or less
Output	Rated current (ambient temperature: 40°C)		20A, 45A, 60A, 100A
	Applied load		Resistive load, inductive load, transformer primary control, rectifier primary control (for cycle control, resistive load (alloy) only)
	Minimum load current		0.5 A (at 100% of rated input voltage)
	Loss of generation		30, 55, 70, 110
Control type			Waveform Control Method Output Voltage Adjustment Range Input/Output Specifications Control Signal (automatic, manual, digital, high/low) Gradient Control Base Load Control Ramp-up Time, Ramp-up Rate, Ramp-down Time Feedback Control Method (Phase Control Only) Manual/Auto Switching Signal
Ambient temperature			From -10 °C to +55 °C (If +40 °C is exceeded, load current must be reduced).
Storage temperature			-20 to +60 °C
Ambient humidity			+5 to +95% RH (non-condensing).
Environment			There must be no actions or vibrations that induce corrosive gases (sulfurized gas, ammonia gas, etc.), fine particles or insulation deterioration. Indoors, altitude up to 1000 m
Insulation	Dielectric strength (between circuit and ground)		2000 V AC, 1 minute
	Insulation resistance (to earth)		10 MΩ or more with a 500 V DC megohmmeter

FAQ — APR-D Single-Phase Power Controller

1. How does a single-phase power controller work?

A single-phase controller modulates the effective voltage applied to a load using power electronic components. This allows the energy supplied to an electric heater or other compatible equipment to be adjusted.

2. What is the difference between a temperature controller and a power controller?

The temperature controller compares the measured temperature to the setpoint and determines the heating requirement. The power controller regulates the power supply to the heating elements based on the received signal. The two devices therefore perform complementary functions in the control loop.

3. How do you choose the rating of a single-phase power controller?

The selection depends on the load current, the temperature inside the cabinet, and any inrush currents. The single-phase power controller APR-D is available in several sizes. Proper sizing must take into account actual operating conditions, particularly for transformers and heating elements with high inrush currents.

4. Can the single-phase power controller APR-D control an inductive load or a transformer?

Yes. The single-phase power controller APR-D can handle resistive and inductive loads, as well as primary-side control of transformers and rectifiers. The control mode and sizing must comply with the conditions specified in the product documentation.

5. What is the difference between phase-angle control and pulse-train control?

Phase-angle control adjusts the on-time during each half-cycle. Pulse-width modulation alternates between full periods of power supply and power cutoff. This second principle is particularly suitable for heaters with sufficient thermal inertia.

6. Can wave trains be used with all loads on the single-phase power controller APR-D?

No. This mode is intended only for resistive alloy loads. Compatibility with an inductive load or a transformer therefore does not apply to all control modes.

7. How do you control the single-phase power controller APR-D from a PLC or a PID controller?

The single-phase power controller APR-D accepts, among other things, a 4–20 mA setpoint or a compatible voltage setpoint. You must verify the signal available on the control equipment and configure the corresponding input. Modbus RTU communication is also available with the ZAM option.

8. What is the difference between current limiting and current regulation?

The current limit prevents the current from exceeding a set threshold. The current control adjusts the output to maintain the current at the requested value. On the single-phase power controller APR-D, these functions depend on the version: CLR current limit on Type A, ACR current control and CLR current limit on Type B.