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Asco Series 7000 Microprocessor Controller

asco4000-controller.jpgThe 7000 Series Microprocessor Based Controller is used with all sizes of Automatic Transfer Switches from 30-4000A. It represents the most advanced digital microprocessor controller in the industry and includes, as standard, all of the voltage, frequency, control, timing and diagnostic functions required for most emergency and standby power applications.

Because of severe voltage transients frequently encountered with industrial distribution systems, the microprocessor logic board is separated and isolated from the power board as shown below. This improves electrical noise immunity performance and helps assure compliance with rigorous transient suppression standards.

The 7000 Series microprocessor controller is a Power Control Center which allows the user to easily access detailed information on: system, power source parameters, voltage, frequency and time delay settings, optional feature settings, historical event log, and system diagnostics. A four line, 20 character LCD has a backlit display which enables easy viewing under all conditions. The user can navigate through all screens using only six buttons.



  • Advanced digital microprocessor.
  • Touch pad programming of features and settings without the need for meters or variable power supplies.
  • Sixteen selectable operating voltages available in a single controller.
  • On-board diagnostics provide control panel and ATS status information to analyze system performance.
  • Displays and counts down active timing functions.
  • Selectable multi-language display (English, German, Portuguese, Spanish, or French).
  • Password protection to prevent unauthorized tampering of settings.
  • Remote monitoring and control with ASCO PowerQuest® communications products. Specify optional accessory 72E.
  • Load shed option for bus optimization applications. Specify optional accessory 30B.

Voltage and Frequency Sensing

  • 3-Phase under and over voltage settings on normal and emergency sources.
  • Under and over frequency settings on normal and emergency.
  • True RMS Voltage Sensing with +/- 1% accuracy; Frequency Sensing Accuracy is +/- 0.2%.
  • Selectable settings: single or three phase voltage sensing on normal and emergency; 50 or 60Hz.
  • Phase sequence sensing for phase sensitive loads.
  • Voltage unbalance detection between phases.

Status and Control Features

  • Output contact (N/O or N/C) for engine-start signals.
  • Selection between "commit/no-commit" on transfer to emergency after engine start and normal restores before transfer.
  • Advanced inphase algorithm which automatically measures the frequency difference between the two sources and initiates transfer at appropriate phase angles to minimize disturbances from transferring motor loads.
  • Event log displays 99 logged events with the time and date of the event, event type and event reason.
  • Output signals for remote indication of normal and emergency source acceptability.
  • Statistical ATS/System monitoring data screens which provide: Total number of ATS transfers, Number of ATS transfers caused by power source failure, Total number of days ATS has been in operation, and Total number of hours that the normal and emergency sources have been available.

Time Delays

  • Engine start time delay - delays engine starting signal to override momentary normal source outages - adjustable 0 to 6 seconds.
  • Transfer to emergency time delay - adjustable 0 to 60 minutes.
  • Emergency source stabilization time delay to ignore momentary transients during initial generator set loading - adjustable 0 to 6 seconds.
  • Retransfer to normal time delay with two settings: Power failure mode (0 to 60 minutes) and Test mode (0 to 60 minutes).
  • Unloaded running time delay for engine cool down - adjustable 0 to 60 minutes.
  • Fully programmable engine exerciser with seven independent routines to exercise the engine generator, with or without loads, on a daily, weekly, biweekly or monthly basis.
  • Pre and post transfer signal time delay for selective load disconnect with a programmable bypass on source failures - adjustable 0 to 5 minutes. This signal can be used to drive a customer furnished relay, or for (2) sets of double throw contacts rated 3 amps at 480 volts AC, specify ASCO optional accessory 31Z.
  • Contains all alarm signals, logic and time delays for use with closed transition switches: Insynch time delay (0 to 3 seconds), Failure to synchronize (1 to 5 minutes), and Extended parallel (0.1 to 1.0 seconds).
  • Delayed transition load disconnect time delay - adjustable 0 to 5 minutes. (Delayed Transition Switches only.)