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Instruction Booklet
Effective: April 2006 Page 5
ATC-300 Automatic
Transfer Switch Controller
5L. Source 2 3-Phase Source 2 Voltage Unbalance/Loss
For a 3-phase wye source, this feature monitors phase
voltage ratios. Voltage unbalance (%) is calculated as the
difference between the maximum and minimum phase volt-
age, divided by the minimum phase voltage. User-select-
able setpoints are available for dropout and pickup
unbalance settings (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 seconds is provided. The factory default
setpoints are: 5% dropout, 3% pickup, and 30 seconds
time delay. A user-selectable setpoint for enable and dis-
able 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) pro-
grammed setpoint. All Tests are Failsafe protected.
6B. Test Pushbutton
Programmable setpoints include:
1. Load, No Load Testing, or Disabled and
2. Engine run time is equal to the Plant Exerciser
Feature 23) setting.
7. Time Delay Emergency Fail (TDEF)
This feature provides a time delay that prevents a con-
nected emergency 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 re-transfer.
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 a membrane pushbutton to bypass
the TDEN time delay.
8D. Bypass TDNE
This feature provides a membrane pushbutton 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, indi-
cates 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 indi-
cates the position of the Source 1 power-switching device.
15F. Source 2 Position Indication Contact
This feature provides 1 Dry Form “C” contact that indi-
cates the position of the Source 2 power-switching device.
23. Plant Exerciser (PE)
This feature provides a means for automatic testing of the
engine/generator set or standby power system. All pro-
grammed time delays will be performed during plant exer-
ciser operations.
23K. Plant Exerciser Selectable – Disabled/1/7/14/28 Day Inter-
val
This feature provides for automatic test operation of the
generator. Available test cycles are daily, 7, 14, or 28
days with duration equal to the programmed engine test
time.
Programmable setpoints allow for selection of three test
cycles:
• Engine Start/Run Only (No Load);
• Exercise with Load Transfer; or Disabled
• This is a “Failsafe” operation.
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