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MX250 series
Microprocessor Controller
P
age 3 • PB-5066
LEDs are used in a recognizable line configuration
for continuous monitoring of switch position. A new
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, 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 (see table below).
A test is standard (fast test/load/no load) to
simulate source 1 failure - automatically bypassed
should source 2 fail.
More Enhanced Features
• Available in ALL transfer modes:
~ Open, Delayed & Bypass
~ Closed (with newly integrated transition control)
• 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. 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
• Extensive 2/5/10 Warranty
Performance Features
• UL, CSA and IEC listed
• Ringing wave immunity per IEEE 472 (ANSI C37.90A)
• Condusted and Radiated Emissions per EN55022 Class B
(CISPR 11) (Exceeds EN55011 & MILSTD 461 Class 3)
• ESD Immunity test per EN61000-4-2 (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 50ms, 5 & 8 kV)
• Conducted immunity test per EN61000-4-6 (ENV50141)
• Voltage dips and interruption immunity EN61000-4-11
Technical Benefits
• Separate line voltage components for controller isolation
• Inputs optoisolated for high electrical immunity to transients and noise
• Built-in electrical operator protection
• Simplified maintenance – major components are easily replaceable
• Close differential under-voltage sensing of the normal source
• Voltage and frequency sensing of the emergency source
(all settings are adjustable)
Entelli-Switch 250
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