Autonics SPR3-225NNF - Slim Three-Phase Power Controllers with LED Display

Slim Three-Phase Power Controllers with LED Display

The SPR3 series three-phase power controllers are ideal for installation in limited spaces with slim body sizes measuring only 105 mm wide. The LED display allows real-time monitoring of control input, load voltage, load current, load power, load resistance, and heat-sink temperature. The controllers feature phase control, cycle control, and ON/OFF control methods, with feedback control (constant current, constant voltage, constant power) option available for accurate and stable power control. With high power efficiency, the three-phase power controllers are ideal for various environments including power transmission and electric power distribution.

Slim Size Measuring Only 105 mm Wide

• The SPR3 series power controllers are approximately 30% slimmer than similar models from other brands, making it easier to install in tight or limited spaces.
  ^{*25A/35A/50A/70A models only}

Bright LED Display

• The 3-digit, 7-segment LED display allows real-time monitoring of control input, load voltage, load current, load power, load resistance, and heat-sink temperature without requiring connection to an external display device.

Feedback Control Option

The SPR3 series power controllers support cycle control, phase control, ON/OFF control methods with option for constant voltage, constant current, and constant power feedback control with ±3% output accuracy. The controllers can handle various types of loads including nichrome, molybdenum, and silicon carbide.

Constant Voltage Feedback Control Mode

Maintains constant output voltage relative to the control input when there is a change in power supply or load resistance of loads with low temperature coefficient of electrical resistance (iron, chrome, nichrome, etc.)

Constant Current Feedback Control Mode

Maintains constant output current relative to the control input when there is a change in power supply or load resistance of loads with high changes (6 to 12 times normal temperature) in temperature coefficient of electrical resistance (platinum, molybdenum, tungsten, etc.)

Constant Power Feedback Control Mode

Maintains constant power supply relative to the control input when there is a change in power supply or load resistance. Ideal for large heaters with high changes in resistance due to overheating such as silicon carbide (SiC).

Various Functions

The power controllers feature various operation functions including Soft Start, Soft Up/Down, Input Correction, and Input Slope Correction. The functions allow safer operation, load protection, and accurate power control.

Output Limit
Limits the power supply to the load so that [control input (%) x OUT ADJ (%) = output value]. Even when the control input is at 100%, if the OUT ADJ value is set to 50%, the output will remain at 50%.

SOFT UP/DOWN
Used to protect the load from inrush current during RUN mode.

Input Correction
Used to compensate the offset between actual input value and measured input value.

Input Slope Correction
Used to compensate the output value from the actual 100% input value and measured 100% input value.

Various Alarm Functions

Error messages (displayed on screen) and alarm indicator (ALM) will blink simultaneously and notify the users if there are operation errors such as diode error, overcurrent, overvoltage, fuse break, heat-sink overheating, or heater disconnection.

Simple Fuse Replacement

The fuse in the power controllers can be easily replaced for integrated fuse type models.

Interphase Insulating Barrier Included

Interphase barriers can be installed for insulation between phases and reduce influence from conductive material. Interphase barriers can easily be installed or removed.

Ordering Information