SPR3 Series - Slim Three-Phase Power Controllers with LED Display

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

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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.

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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.

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  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%.

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  SOFT UP/DOWN

  Used to protect the load from inrush current during RUN mode.

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  Input Correction

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

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  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.

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Simple Fuse Replacement

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

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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.

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