Single Phase SCR Power Pak - MaxPac I

MaxPac I
Single Phase SCR Power Pak - MaxPac I
  • 120-600 VAC @ 100-1200 Amp
  • User Adjustable Firing Modes Include:
       - On/Off Control Inputs: 120 VAC, 240 VAC, 5-32 VDC Dry Contact Closure
       - Proportional Zero Cross or DOT Firing Power Control Inputs: 4-20mA, 0-5 VDC, 1-5 VDC, 0-10 VDC
  • Flexible I/O Power Wiring
  • Built-In Power Distribution
  • Shorted SCR Detection (Option)
  • Easy Customer Interface
  • Remote Stop
  • Electronically Protected with Temperature Warning and Shutdown System
  • Compact Size and Construction
  • Touch-Safe (Option on 100 to 650 Amp Models)
  • dv/dt Transient Voltage Protection
  • MOV Protection
  • Single or Three Cycle Resolution (Jumper Selectable)
  • Third-party certifications: cULus, CE, D

The MaxPac Series is specifically designed for the OEM market. The plug-in options, flexible I/O power wiring, space saving footprint, optional lug kits, I2t fusing and universal approvals make it an excellent candidate for your product.

The Chromalox Model MaxPac I Single Phase Solid State SCR Power Controller is a highly versatile power pak with optional plug-in Shorted SCR Detection Boards. Firing modes can be switched between On/Off and proportional Zero Cross or DOT Firing power control at any time based on process needs.

Chromalox’s exclusive DOT (Demand Oriented Transfer) firing switches the fewest number of cycles to provide the most precise zero crossover control. At 50% output the unit’s output alternates between one electrical cycle on and one cycle off. At 51% the output continues with one cycle on / one cycle off and gradually integrates one extra “on” cycle for the additional one percent. With the exception of phase angle firing, DOT firing is the most precise method of SCR control. DOT firing is preferred in many applications because phase angle firing creates unwanted RFI. DOT is excellent for applications where consistent heater/process temperature control is critical.

The MaxPac Viewer Configuration Software allows users to program a variety of parameters and settings into their MaxPac I, II, III and MiniMax I, II, and III power controllers. Power management, alarm monitoring, firing mode, and cycle time adjustment are just a few of the settings available. The software also has a service platform for troubleshooting and maintenance on the spot.

Current Release Version: 1.0.0
(Note: New configuration software releases occur without notice. If you need to update your release, you must first uninstall your current version prior to installing the latest release. This may be done in Programs and Features located in the Windows Control Panel.)


MaxPac Power Controller Configuration Software

  • Resistive Heaters
  • Electric Ovens
  • Furnaces
  • Kilns
  • Environmental Chambers

Mechanical Features:

  • LED Indication of Firing
  • Customer Control Connections are made on a Plug-In Screw Type Terminal Block
  • Optional Remote Manual Adjust and Auto/Manual Switch
  • Heatsink Mounted Temperature Sensor
  • Built-In Power Distribution
Electrical Features:
  • SCRs PIV 1200V Minimum (1500 Volts on 600 Volt model)
  • Isolated Semiconductor Power Blocks are used on all Current Ratings up to 650 Amps
  • UL 508 for units 650 Amps and under
Safety Features

Personnel Safety:
  • Ground Potential Heat Sink up to 650 Amps
  • SCR to Heat Sink Isolation up to 650 Amps
  • Touch-Safe Option
  • CE Compliance: Line filters are required.
Equipment/Process Safety:
  • Input to Output Isolation
  • dv/dt Transient Voltage Protection
  • Optional I2t Fusing
  • Remote Shutdown
  • Optional Shorted SCR Detection
  • MOV
For more features refer to catalog page PDF under the Technical Resources tab.

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