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asprey controllers

ASPYRE® SCR Power Controllers    SpecSheet

Watlow’s new ASPYRE SCR power controller family is flexible and scalable, and available with a variety of options allowing one platform to be re-used across a wide range of applications, which can help save time and money. ASPYRE models available include sizes from 35 to 700 amps.

This power controller family features multiple advanced microprocessor-based firing and control mode algorithms. Combined with diagnostics and several communications options the product enables equipment and factory automation.

Controller firing modes include zero cross, burst firing, single cycle, delayed triggering and phase angle. These smart algorithms enable the product to easily control a wide base of heater loads including Nichrome®, moly, silicon carbide, tungsten quartz and infrared lamps and transformer-coupled loads. ASPYRE offers a comprehensive list of modular options that deliver space and labor savings including controlled legs (1, 2 or 3), semiconductor fusing, load current measurement, amperage size and user interface.


Power Bases
• Single-phase, 1 controlled leg (2 SCRs)
• Three-phase, 2 controlled legs (4 SCRs)
• Three-phase, 3 controlled legs (6 SCRs)
Load Amp Range
• 35A to 700A @ 40°C ambient
• Amperage derating curve for other ambient temperatures
SCR and Amperage Rating
• Latching current 1A min.
• Power dissipation: approximate 1.25 to 1.5 watts per amp per controlled leg
• Leakage current: 15mA
• SCCR rating 100,000A up to 600VAC
Line and Load Voltage Range
• 24 to 480V
• 24 to 600V
• 24 to 690V
Voltages -/+ 10% min./max.
690VAC only available on units ≥300A
• Isolation voltage 2500V
Voltage frequency
• 50 to 60Hz
• Automatically compensates for 47 to 70Hz
Controller Operating Supply Voltage

Nominal Line Voltage (VAC) RMS         
• 100/120VAC                                 
• 200/208/220/230/240VAC             
• 277VAC                      
• 380/400/415/440/480VAC       
• 600VAC               
• 690VAC            
Max. Operating Range
• 90 to 135VAC
• 180 to 265VAC
• 249 to 305VAC
• 342 to 528VAC
• 540 to 660VAC
• 621 to 759VAC

Control Modes and Load Types
• Voltage, voltage squared, current, current squared, power, open loop and external
• All control modes available with any firing type combination
• Normal resistive loads: nichrome, infrared lamps; medium and long waveform
• Others: Moly (Kanthal® Super), transformers, silicon carbide, UV lamps, tungsten
Digital Inputs 1 and 2
• ON >=4VDC, OFF <= 1VDC
• 4-30VDC @ 5mA max.
• Digital input functions: enable, change to V feedback, local/remote set point enable, change firing between phase angle and default firing mode, ref 1 / 2  selection, log enable, bakeout enable
• A switched VDC control output can be connected to the digital input as an open loop control mode command signal
Output Control Firing Types
• Zero crossing
• Single cycle
• Burst firing with delayed triggering, safety ramp and peak current limit options
• Burst firing with soft start option (phase angle soft start switching over to burst firing)