MX250 Microprocessor Controller

MX250 Microprocessor Controller

The MX250 microprocessor is standard with the entire CTS product family. The MX250 Series includes all the standard features of the MX150 Controller while offering expanded programmability and ...
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Technical Summary

Rating Range
Switch Dependent
Transfer Type
Application Dependent
Switch Type
Application Dependent

Controller Specifications

Undervoltage Dropout for Source 1 and Source 2
75-98% of nominal
Undervoltage Restore for Source 1 and Source 2
85-100% of nominal
Underfrequency Dropout for Source 1 and Source 2
90-100% of nominal
Delay for Engine Cool Down (U)
0-60 minutes
Delay Transfer to Nonpreferred Source (W)
0-5 minutes
Delay NeutralTransition Time Delays (DT,DW)
0-10 minutes
Storage Temperature
(-30?C - 75?C ), -22?F - 167?F
Operating Temperature Ambient
40 - 400 amp molded shell (-20?C to 65?C) , -4?F to 149?F
40 - 4000 amp all others (-20?C to 60?C), -4?F to 149?F

Features and Benefits

  • Available to support ALL transfer modes:
    –Open, Delayed and Closed Transition
  • User-friendly programmable engine exerciser,with or without load, at ANY interval in a one-year period
  • A wide variety of operating voltages available in a single controller for most domestic and international applications
  • Real-time display of ATS status, including active timer(s)
  • Multiple levels of user-defined password protection
  • Serial communications allowing connectivity with other ATS's, Caterpillar® Switchgear, and SCADA systems
  • Time-tested synchronous logic automatically measures phase angle and frequency allowing disturbance-free transfer
  • Unsurpassed statistical ATS/System monitoring available in real-time
  • Elevator pre-signal contacts automatically bypassed if the selected source fails, minimizing time an elevator is without power
  • Universal Motor Disconnect (UMD) sends a pre-signal, post-signal or both to any motor control center. Not bypassed in an outage,the UMD ensures safety in the event of a single phase loss
  • Voltage unbalance detection standard
  • Also includes all standard MX150 features
  • Back-lit/temperature compensated LCD display (includes the display of source voltage and frequency, exercise time, delay options and source condition)
  • Close differential 3-phase under-voltage sensing of source 1, factory standard setting 90% pickup, 80% dropout; under-frequency sensing of source 1 factory setting 95% pickup;voltage and frequency sensing of source 2,factory standard setting 90% pickup voltage,95% pickup frequency.
    All factory settings are operator adjustable.
  • LED indicators for ATS position and source availability
  • Plant exerciser clock (configured for 1, 7, 14 or 28 day run selections)
  • Built-in time delays with count-down display
  • Push button to bypass time delay transfer/retransfer
  • Transfer/commit/no commit selection In-phase monitor
  • Event logging (last 16 events)
  • A test is standard (fast test/load/no load) to simulate source 1 failure – automatically bypassed should source 2 fail.

Standard Equipment: