Specifications

February 2007
16-32
For more information visit: www.eaton.com CA08101001E
Transfer Switches
16
Transfer Switch Equipment
ATC-300 Controller
ATC-300 Controller
ATC-300 Controller
Product Description
AT3 switches are equipped with the
high-performance ATC-300 digital
transfer controller for rock-solid moni-
toring, status reporting and transfer
control operation. Superior design and
robust construction make the AT3 the
industry benchmark for critical and
distributed power systems.
Application Description
The Cutler-Hammer AT3 Automatic
Transfer Switch from Eaton’s electrical
business is designed to provide
unmatched performance, reliability
and versatility for critical standby
power applications.
Features, Benefits and
Functions
Standard Features
■ Auxiliary relay contacts:
❑ Source 1 Present 2NO & 2NC
❑ Source 2 Present 2NO & 2NC
■ Switch position indication contacts:
❑ Source 1 Position 1NO & 1NC
❑ Source 2 Position 1NO & 1NC
■ Source 1 & Source 2 sensing:
❑ Undervoltage/under frequency
❑ Overvoltage/over frequency
❑ 3-phase rotation protection
❑ 3-phase voltage unbalance/loss
■ Pre-transfer signal contacts 1NO/
1NC.
■ Go to Emergency (Source 2).
■ Seven field programmable time
delays.
■ LCD-based display for program-
ming, system diagnostic and Help
message display.
■ Mimic diagram with source avail-
able and connected LED indication.
■ Time-stamped history log.
■ System test pushbutton.
■ Programmable plant exerciser —
OFF, daily, 7, 14, 28-day interval
selectable run time 0 – 600 minutes
no load/load with fail-safe.
■ Safe manual operation under full
load with permanently affixed
operating handle.
Optional Features
■ Suitable for Use as Service Equip-
ment in the standard enclosure size.
■ Available TVSS surge suppression
for power/controller, engine start
circuit, phone and cable
connections.
■ Integrated distribution panels.
■ Field-selectable multi-tap trans-
former panel permits operation on a
wide range of system voltages.
■ Integral overcurrent protection.
■ Space heater with thermostat.
■ Ammeter — load side.
■ Stainless steel cover for controller.
Table 16-37. Programming Selections
Product Specifications
Table 16-38. ATC-300 Controller Specifications
Parameters Set Points
TDNE
TDEN
TDEC
0 to 1800 Seconds
0 to 1800 Seconds
0 to 1800 Seconds
TDES
TDN
TDEF
0 to 120 Seconds
0 to 120 Seconds
0 to 6 Seconds
In Phase Enabled or Disabled
In Phase
Frequency Difference
0.0 to 3.0 Hz
Sync Time 1 to 60 Minutes
Pre-Transfer
Signal Service
0 to 120 Seconds
Plant Exerciser Disabled, 7, 14 or
28 Day Interval,
0 – 600 Minutes,
Load or No Load
Sensing 3-phase or 1-phase
System Selection Utility — Utility or
Utility — Generator
PT Ratio 2:1 to 500:1
Commit to Transfer
in TDNE
0 or 1
Re-Transfer Mode Automatic or Manual
Engine Test Mode Disabled, Load or
No Load
Description Specification
Input Control Voltage 65 to 145 Vac 50/60 Hz
Voltage Measurements of Source 1 V
AB
Source 1 V
BC
Source 1 V
CA
Source 2 V
AB
Source 2 V
BC
Source 2 V
CA
Voltage Measurement Range 0 to 790 Vac rms (50/60 Hz)
Voltage Measurement Accuracy ±2% of nominal input voltage
Frequency Measurement for Source 1 and Source 2
Frequency Measurement Range 40 Hz to 70 Hz
Frequency Measurement Accuracy ±0.1 Hz
Undervoltage Dropout Range 50% to 90% of nominal voltage
Undervoltage Pickup Range (Dropout +2%) to 99% of the Nominal System Voltage
Overvoltage Dropout Range 105% to 120% of nominal voltage
Overfrequency Pickup Range 101% to (Dropout -1 Hz) of the Nominal System Frequency
Underfrequency Dropout Range 90 to 97% of the Nominal System Frequency
Underfrequency Pickup Range (Dropout +1 Hz) to 99% of the Nominal System Frequency
Overfrequency Dropout Range 103 to 110% of the Nominal System Frequency
Overfrequency Pickup Range 101% to (Dropout -1 Hz) of the Nominal System Frequency
Operating Temperature Range -20 to +70°C (-4 to +158°F)
Storage Temperature Range -30 to +85°C (-22 to +185°F)
Operating Humidity 0 to 95% Relative Humidity (Non-condensing)
Operating Environment Resistant to Ammonia, Methane, Nitrogen, Hydrogen and
Hydrocarbons
Generator Start Relay 5 A, 1/6 hp @ 250 Vac / 5 A @ 30 Vdc with a 150 W Maximum Load
K1, K2, Pretransfer, Alarm Relays 10 A, 1 – 3 hp @ 250 Vac / 10 A @ 30 Vdc
Applicable Testing UL Recognized Component
Meets Intent of UL 991, 1008
Meets IEC 1000-4-2, 1000-4-3, 1000-4-4, 1000-4-5, 1000-4-6, 1000-4-11
Meets CISPR 11, Class A
Complies with FCC Part 15, Class A
Enclosure Compatibility NEMA 1, NEMA 3R, and NEMA 12
UV Resistant ATC-300 Faceplate