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.

Rating Range 120 to 600V, single phase and three phase @ 50/60 Hz
Transfer Type Switch application dependent
Switch Type Switch application dependent

Input Control Voltage 120Vac (50/60 Hz) (operating range 65 to 160 Vac)
Voltage Measurements of Utility Source 1, Source 2 and Load
(VAB, VBC, VCA for Three Phase System)
Voltage Measurement Range 0 to 700 Vac
Voltage Measurement Accuracy +/-1% of full scale
Frequency Measurements Of Source 1 and Source 2
Frequency Measurement Range 40 Hz to 80 Hz
Frequency Measurement Accuracy +/- 0.1 Hz
Undervoltage Dropout Breaker 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 Range 90 to 97% of Nominal System Frequency
Underfrequency Pickup Range (Dropout +1 Hz) to 99% of Nominal System Frequency
Overfrequency Dropout Range 103 to 110% of Nominal System Frequency
Overfrequency Pickup Range 101% to (Dropout +1 Hz) of nominal system frequency
Operating Temperature Range -20 to 70 degree C (-4 to +158 degree F)
Operating Humidity Up to 90% Relative Humidity (non-condensing)
Enclosure Compatibility
  • NEMA 12 (std mounting)
  • NEMA 3R
  • UV Resistant Faceplate
  • System Voltage Application 120 to 600 Vac (50/60 Hz) (single or three phase)

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