Three-phase thyristor power controller – APR-D

Three-phase power control

Fields of application

Three-phase resistive heating for electric furnaces, ovens, and industrial dryers, and control of resistance heating elements on production lines.

Benefits

Three-phase control
Independently adjustable ramps
Built-in Digital Settings
Optional Modbus RTU

Reference: RPDW

Retail price
, depending on configuration €811

Discounts available on request

Features
Documentation
Applications

Features

Fuji Electric’s APR-D three-phase thyristor power controller regulates resistive loads in industrial heating equipment. It adjusts the output voltage to the setpoint of the control system using electronic control across all three phases. Several control modes allow its operation to be tailored to the thermal process. Start-up, ramp-up, and ramp-down times can be adjusted separately to accommodate heating transitions. Integrated adjustment and display functions facilitate system commissioning. For connected equipment, an optional communication card allows users to modify parameters and view operating information via an RS-485 Modbus RTU network.

Input	Main circuit	Rated voltage	Three-phase 200 to 240 V AC ±10% (performance guarantee), ±15% (functional guarantee) 380 to 480 V AC ±10% (performance guarantee), ±15% (functional guarantee)
		Frequency	50 Hz/ 60 Hz ±2.5 Hz (Must be the same as the control circuit).
	Control circuit	Feeding capacity	15 VA or less
Output	Rated current (ambient temperature: 40°C)		20A, 45A, 60A, 100A
	Applied load		Resistive load
	Minimum load current		0.5 A (at 100% of rated input voltage)
	Loss of generation		75, 155, 196, 317
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 Scan Interval Control
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)		2 kV AC, 1 minute (200 to 240 V); 2.5 kV AC, 1 minute (380 to 480 V)
	Insulation resistance (to earth)		10 MΩ or more with a 500 V DC megohmmeter

FAQ — APR-D Three-phase power controller

1. What is the purpose of a three-phase power controller for industrial heating?

A three-phase power controller adjusts the power supply to a heating system based on the setpoint from the control system. The three-phase power controller ;APR-D is designed for resistive loads. To learn more about the role of this technology in thermal processes, see our application on the electrification of industrial furnaces using power controllers.

2. How do you choose a power controller for a three-phase electric oven?

The selection is based on the line voltage, the current through the resistors, their connection, and the temperature inside the cabinet. For the three-phase power controller APR-D, you must also verify the control circuit power supply and the options required for the installation.

3. What is the difference between a single-phase and a three-phase power controller APR-D?

The two versions are designed for different electrical architectures. The three-phase power controller APR-D controls resistive loads on a three-phase power supply. The single-phase version also supports certain inductive applications and the primary-side control of transformers or rectifiers. The choice depends on the power grid and the load to be controlled.

4. Is the three-phase power controller APR-D compatible with a 400-volt power system?

Yes, a three-phase power controller APR-D configuration supports 400-volt networks. However, it is important to distinguish between the main circuit power supply and the control circuit power supply, and to select the transformer that corresponds to the required configuration.

5. Can we order a transformer with the three-phase power controller APR-D?

The three-phase APR-D is used with resistive loads. To order a three-phase transformer, you must select a solution explicitly designed for inductive loads and have the application conditions verified.

6. What are the purposes of the starting, ascending, and descending ramps?

Ramps allow the electrical output to change gradually during startup or when the setpoint is changed. On the three-phase power controller APR-D, the three ramp times are adjustable separately from 0 to 100 seconds. They affect the electrical control; the temperature change also depends on the process.

7. Should the controller be oversized when the cabinet temperature exceeds 40 °C?

The rated currents for the three-phase power controller APR-D are specified for an ambient temperature of 40 °C. At higher temperatures, the allowable current decreases. The manufacturer’s derating curve must be used to determine whether the selected size is sufficient or whether a larger size is required.

8. Can the three-phase power controller APR-D be monitored via Modbus RTU?

Yes, with the optional ZAM communication card. It provides access to settings and operating information via an RS-485 Modbus RTU network. This option must be specified when defining the product part number. Our article on the communication features of SCR power controllers provides a more detailed overview of how they can be integrated into industrial control systems.