Digital Energy
Zenith MX250
Entelli-Switch Microprocessor Controller
With more powerful integrated features, the Entelli-Switch 250 microprocessor, standard with the entire GE Zenith ZTS product family, offers expanded programmability and field adaptability. This premium controller is designed for use in specification-grade applications. As an embedded digital controller, the Entelli-Switch 250 series offers high reliability and ease of unattended operation across a range of applications.
• Available in ALL transfer modes:
~ Open, Closed, Delayed and Bypass
User-Friendly Operation
LEDs are used in a recognizable line configuration for continuous monitoring of switch position. A 4×20 character LCD display shows source availability, exercise time delay operation and system source condition. A new simplified adjustment is featured for voltage,
frequency and time delay settings. The control operates off a close differential 3-phase
under-voltage sensing of Source 1 (normal), factory standard setting 90% pickup, 80% dropout; underfrequency sensing of Source 1 factory setting 95% pickup; voltage and frequency sensing of Source 2 (emergency), factory standard setting 90% pickup voltage, 95% pickup frequency. All factory settings are operator adjustable (see table on reverse side). A test is standard (fast test/load/no load) to simulate Source 1 failure – automatically bypassed should Source 2 fail.
Features and Benefits
- User-friendly programmable engine exerciser, used for the engine generator with or without load, at any interval in a one-year period
- 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, paralleling 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
- T3/W3 elevator pre-signal timer and output contacts. Automatically bypassed if the selected source fails, minimizing time an elevator is without power
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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.
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Voltage unbalance detection standard
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Optically isolated inputs and outputs
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Includes all standard Zenith MX150 microprocessor controller features
Fully Approved
- UL and CSA listed
- Ringing wave immunity per IEEE 472
(ANSI C37.90A) - Conducted and Radiated Emissions per
EN55022 Class B (CISPR 22) (Exceeds
EN55011 & MILSTD 461 Class 3) - ESD Immunity test per EN61000-4-2
Class B (Level 4) - Radiated RF, electromagnetic field
immunity test per EN61000-4-3
(ENV50140) 10v/m - Electrical fast transient/burst immunity
test for EN61000-4-4 - Surge immunity test per EN61000-4-5
IEEE C62.41 (1.2 x 50μs, 0.5 to 4 kV) - Conducted immunity test per
EN61000-4-6 (ENV50141) - Voltage dips and interruption immunity
EN61000-4-11
