For more information visit: www.eaton.com IB01602008E
Instructional Booklet
Page 14 Effective: March 2014
ATC-300 Breaker Based Transfer Switch
5K. 3-Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 120% of nominal
Pickup: 103% to (Dropout –2%) of nominal
Adjustable Overfrequency:
Dropout: 103 - 110% of nominal
Pickup: 101% to (Dropout -1Hz) of nominal
5L. Source 2 3-Phase Voltage Unbalance
For a 3-phase wye source, this feature monitors phase volt-
age ratios. Voltage unbalance (%) is calculated as the differ-
ence between the maximum and minimum phase voltage,
divided by the minimum phase voltage. User-selectable set-
points are available for dropout and pickup unbalance set-
tings (minimum 2% differential). Dropout is adjustable from
5 to 20%. Pickup is adjustable from 3 to (Dropout –2%). A
setpoint for user-selectable time delay from 10 to 30 sec-
onds is provided. The factory default setpoints are: 5%
dropout, 3% pickup, and 30 seconds time delay. A user-
selectable setpoint for enable and disable is also provided.
When an unbalance condition is detected on Source 2, the
Unbalance Timer (TD UNBAL) starts timing. After TD
UNBAL times out, Source 2 is declared “failed”.
For a 3-phase delta source, this feature should be turned off
via the VOLT UNBAL setpoint.
6. Test Operators
Eaton ATSs are provided with a Test Pushbutton that simu-
lates a loss of the Source 1 power source as standard (Fea-
ture 6B). All programmed time delays (TDNE, TDEN, etc.)
will be performed as part of the Test. Engine run time of the
Test is equal to the Plant Exerciser (Feature 23) programmed
setpoint. All Tests are Failsafe protected.
6B. Test Pushbutton
Programmable Setpoints include:
1. Load or No Load Testing, or Disabled
2. Engine run time equal to the plant exerciser (Feature
23) setting
7. Time Delay Emergency Fail (TDEF)
This feature provides a time delay that prevents a connected
Source 2 power source from being declared “Failed” in order
to override momentary generator fluctuations. If the Source
2 power source remains in the failed state then, 0.5 seconds
after the TDEF timer expires, the transfer switch will proceed
with the programmed sequence for retransfer. This time
delay is only implemented when the Source 2 power source
is a generator.
Adjustable 0 - 6 Seconds
8. Time Delay Bypass Pushbutton
This feature provides a way (by pushing the Help and Step
pushbutton simultaneously) to bypass the TDNE (Feature 1)
and/or TDEN (Feature 2) time delays. The Time Delay
Bypass function, when activated by pushing the Help and
Step pushbutton simultaneously, will reduce any or all of the
programmed time delay to zero.
8C. Bypass TDEN
This feature provides one set of pushbuttons to bypass the
TDEN time delay.
8D. Bypass TDNE
This feature provides one set of pushbuttons to bypass the
TDNE time delay.
12. Power Source Annunciation
This feature provides LEDs to give switch position and power
source availability indications.
Switch Position
Provides LEDs to indicate the switch position.
12C. Source 1 - Source Connected
This feature provides a green LED that, when lit, indicates
the load is connected to Source 1.
12D. Source 2 - Source Connected
This feature provides a red LED that, when lit, indicates the
load is connected to Source 2.
Power Source Availability
Provides LEDs to indicate if a power source is available.
LEDs may be integral or separate from the controller.
12G. Source 1 - Available
This feature provides a white LED that, when lit, indicates
Source 1 is available.
12H. Source 2 - Available
This feature provides an amber LED that, when lit, indicates
Source 2 is available.
14. Relay Auxiliary Contacts
14G. Source 1 Present: Provides two (2) normally open and two
(2) normally closed contacts. The relay is energized when
Source 1 is available.
14H. Source 2 Present: Provides two (2) normally open and two
(2) normally closed contacts. The relay is energized when
Source 2 is available.
15. Switch Position Indication Contact
This feature provides a contact that indicates if the power
switching device is in the “Open” or “Closed” position.
15E. Source 1 Position Indication Contact
This feature provides 1 dry form “C” contact that indicates
the position of the Source 1 power switching device.
15F. Source 2 Position Indication Contact
This feature provides 1 dry form “C” contact that indicates
the position of the Source 2 power switching device.
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