Ideal solution for high-precision operation

Latest integrated drive technology for vacuum capacitors at best price-performance ratio.

Motorized capacitors are the ideal solution for high-precision operation. Besides ensuring  highest accuracy, motorized capacitors simplify procurement with an easy-to-install subsystem. The core components of Universal Integrated Drive systems are a Comet variable Vacuum Capacitor, mounted with an insulating cover, coupler and stepper-motor. A durable, backlash-free Comet-coupler connects the capacitor to the drive system.

Integrated flanges ensure easy mounting in the system. Appropriate high-voltage insulation between the capacitor and the flanges is also included.

High-level commands

The module can be controlled from a PC or a control board using high-level commands (RS232, RS485 for Universal ID). The communication protocol allows the execution of the following commands.

  • Precise motion control by setting full-step, micro-step or capacitance position
  • Set idle and drive current, speed and slave address within allowed range
  • Read out of actual full-step, micro-step and capacitance position
  • Read out of characteristic capacitance curve (C-Curve)
  • Read out of various parameters such as firmware version, serial number and all customer and factory limits
  • Comprehensive RX responses (ACK, NAK):
    – ACK for all commands
    – ACK for «movement-started» resp. «movement completed»
    – NAK e.g. check-sum error, index out of range
  • Baud rate can be set within 9.600 to 115.200 Bd
  • Set user limits (Cmin and Cmax) within factory limits
  • Store up to 10 user selectable positions

Capacitor tuning

Using a stepper-motor, the capacitance of the variable capacitor can be tuned precisely between user selectable limits.


Integrated Drive Vacuum Capacitors

Universal ID

Integrated drive solution


  • One driver PCB for new Integrated Drives (ID-400 and ID-1200)

  • Same communication Comet protocol RS232 and RS485

  • Flexible baud rate between 9.600 and 115.200 Bd

  • Connect up to 32 modules in RS485 mode

  • Readout of full-step, micro-step and capacitance position

  • Capacitance table with higher resolution on request


  • Accurate alignment of variable Vacuum Capacitor and stepper-motor and a durable, backlash-free coupling result in long, consistent lifetime
  • Assembled solution for easy installation for higher system uptime and productivity
  • Highly accurate repeatability of capacitance positions
  • Increased capacitance resolution (position control) to 0.01 pF
  • Lower total cost of ownership

Technical Specifications

Capacitance Cmax range 100 - 2000 pF

Upt range

3 - 25 kV

max. current IRMS at 13.56 MHz

72 - 170 ARMS


55 - 117 mm


230 - 280 mm

Cooling system


RoHS conform


Supply voltage

+24 VDC
Supply current Ip < 1.1 A (ID-400)
Ip < 2.8 A (ID-1200)
Full-step angle 1.8 °

Motor speed

up to 600 rpm

Micro-stepping 16 micro-steps
Operating temperature +5  –  +50 °C
Available interfaces RS232, RS485
Address range (RS485) 0 x 21 – 0 x 40
Baud rate 9.600 – 115.200 Bd


  • Semiconductor
  • Flat Panel Display 
  • Solar
  • MEMS

Two sizes of integrated drive systems are available for different capacitor series. Here our recommendations:


e.g. Uni-Con, Uni-Select


e.g. Power-Con, Hexa-Con, Maxi-Con



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