Products/Power Control Assembly (PCA)

Thayer Scale manufactures a variety of industrial control panels certified for the US and Canadian markets by UL’s Panel Shop Program.

For installations where a motor control center has no more available space, Thayer offers a comprehensive series of packaged drives. These Power Control Assemblies (PCAs) convert standard AC utility to an adjustable output that controls (1) permanent magnet or shunt wound DC motors, (2) inverter-rated AC motors, and (3) electromagnetic drives used with vibratory tray feeders.

Each PCA provides a plug and play adjustable speed drive solution that features:

  • Code-compliant external disconnect (as required by input utility)
  • Branch circuit protection (fusing)
  • Interlocking logic to support a variety of operating modes
  • Terminal strip for user’s input utility, and input and output wiring
  • Adjustable speed drive (VFD, SCR, voltage regulator)
  • Components needed to complete a basic analog drive controller package

Thayer Scale’s PCAs are available with a variety of options, including:

  • Chassis mounting construction that can be installed within a panel or enclosed for field mounting in any location
  • Local or remote operator station
  • Ethernet IP device level interface (VFD only)

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Variable Frequency AC Motor Drives

THAYER SCALE uses a number of different Variable Frequency Controllers to match a particular applications unique requirement. For general application Thayer Scale will use either Allen Bradely Power Flex 40© or SEW Movitrac© LTE-B. Should a customer standardize on a particular manufacturer of controller Thayer Scale will try and use that brand as long as it meeds our standards for control and accuracy.

AC Output Power Control Assembly (PCA)

Thayer’s Power Control Assembly (PCA) or Drive Controller is designed to accept a standard 230-380-480VAC 3 Phase 50 or 60 Hertz Power Source. This unit takes the incoming AC line voltage and converts it to an adjustable frequency output by means of an Electronic Drive Controller. The Drive Controller is controlled by either a Manual Speed Potentiometer or by an External Input Speed Signal and can be used in applications that meet the following specification ranges:

  • ½ – 2 Horsepower
  • 380-480 VAC
  • 3 Phase Invertor Duty Induction Motors

consult factory for higher horse power sizes.

SCR/DC Output Power Control Assembly (PCA)

The Thayer Power Control Assembly (PCA) is designed to accept standard AC Power Sources.

This unit takes the incoming AC line voltage and converts it to an adjustable DC voltage by means of an SCR controller. The DC voltage’s amplitude is controlled by either a manual speed potentiometer or by remote current signal. The adjustable DC voltage is capable of controlling conventional shunt wound or permanent magnet DC motors.

PCA-VIB for Electromagnetic Vibratory Feeders Power Control Assembly (PCA)

The Power Control Assembly (PCA) or Drive Controller is designed to accept standard AC Power Sources. This unit takes the incoming AC line voltage and converts it to an adjustable output voltage by means of an Electronic Drive Controller. The Drive Controller is controlled by either a Manual Speed Potentiometer or by an External Input Speed Signal and can be used in applications that meet the following specification ranges:

  • PCA-VIB-120 0-110 VAC Vibrating Tray Motors with a full load current rating of less than 15 amperes
  • PCA-VIB-240 0-220 VAC Vibratory Tray Motors with a full load current rating of less than 15 amperes

NOTE: Conventional electromagnetic vibrating tray motors (full wave rectification)