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The ATC-900 C9ontroller is a programmable microprocessor-based monitoring device for use on Cat transfer switches. Data access and programming operations are performed using the ATC-900’s touch sensitive function buttons in conjunction with an easy-to-read illuminated alphanumeric LED display. Both the functional buttons and the display window are part of the device’s door mounted front panel. A built in Help button provides user assistance in the form of message displays.

The communication option permits monitoring and control of several transfer switches, locally or remotely from a single point. Depending on the application, the user can customize the ATC-800 to meet the particular application. The ATC-900 is equipped to display historical information either via the front panel or over mod bus communications to a personal computer. Source 1 and Source 2 run time, available time and connect time are available, as well as load energized time, number of transfers, date, time and reason for the last 16 transfers.

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Rating Range120 to 600V, single phase and three phase @ 50/60 Hz

Transfer TypeSwitch application dependent

Switch TypeSwitch application dependent

Input Control Voltage120Vac (50/60 Hz) (operating range 65 to 160 Vac)

Voltage Measurements of UtilitySource 1, Source 2 and Load
(VAB, VBC, VCA for Three Phase System)

Voltage Measurement Range0 to 700 Vac

Voltage Measurement Accuracy+/-1% of full scale

Frequency Measurements OfSource 1 and Source 2

Frequency Measurement Range40 Hz to 80 Hz

Frequency Measurement Accuracy+/- 0.1 Hz

Undervoltage DropoutBreaker Style 50 to 97% of Nominal System Voltage
Contactor Style - 78 to 97%

Undervoltage Pickup(Dropout +2%) to 99% of Nominal System Voltage

Underfrequency Dropout Range90 to 97% of Nominal System Frequency

Underfrequency Pickup Range(Dropout +1 Hz) to 99% of Nominal System Frequency

Overfrequency Dropout Range103 to 110% of Nominal System Frequency

Overfrequency Pickup Range101% to (Dropout +1 Hz) of nominal system frequency

Operating Temperature Range-20 to 70 degree C (-4 to +158 degree F)

Operating HumidityUp to 90% Relative Humidity (non-condensing)

Enclosure Compatibility

  • NEMA 12 (std mounting)
  • NEMA 3R
  • UV Resistant Faceplate
  • System Voltage Application120 to 600 Vac (50/60 Hz) (single or three phase)



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