IB140024EN
For more information visit: www.eaton.com
Instruction Booklet
Effective: October 2014
Page
9
ATC-300/900 40-400A (480/600Vac)
3-Postion Contactor Based Transfer Switch
3.5 Features
A variety of standard and optional features are available for Eaton
ATSs.
All features or combinations of features may not be avail-
able on specific ATSs
. All features and/or accessories are Under-
writers Laboratories (UL) listed unless noted. See specific
controller Instruction Booklets for additional options and stan-
dards.
3.5.1 Standard Features
The following is a list of the standard features of the ATC-300+
Controller. The ATC-900 controller has many new standard fea-
tures compared to the ATC-300+. If the ATC-900 is used on the
switch, please see the ATC-900's Instruction Booklet for these
additional user features.
1.
Time Delay Normal to Emergency (TDNE)
This feature provides a time delay when transferring from
the Source 1 to the Source 2 power source. Timing begins
when Source 2 becomes available. It permits controlled
transfer of the load circuit to Source 2.
Adjustable 0 - 1800 Seconds
2.
Time Delay on Engine Starting (TDES)
This feature provides a time delay of the signal to initiate
the engine/generator start cycle in order to override
momentary power outages or voltage fluctuations of
Source 1.
Adjustable 0 - 120 Seconds
3.
Time Delay Emergency to Normal (TDEN)
This feature provides a time delay of the re-transfer opera-
tion to permit stabilization of Source 1. Timing begins
when Source 1 becomes available. If Source 2 fails during
timing, then re-transfer is immediate overriding the time
delay.
Adjustable 0 - 1800 Seconds
4.
Time Delay for Engine Cool-down (TDEC)
This feature provides a time delay of the signal to initiate
the engine/generator stop cycle after the re-transfer opera-
tion. This allows the engine/generator to cool down by run-
ning unloaded. Timing begins on completion of the re-
transfer cycle.
Adjustable 0 - 1800 Seconds
5.
Source 2 Monitoring and Protection
This feature provides monitoring and protection based on
the Source 2 voltage and/or frequency setpoints. All fea-
ture 5 functions are Failsafe operations.
5H. Phase Reversal
For a 3-phase wye source, this feature monitors the phase
sequence of the sources. If a source does not have the
same ABC or CBA sequence as the setpoint value, that
source will be considered “Unavailable.
For a 3-phase delta source, this feature should be turned off
via the PHASE REV setpoint.
5J. All Phase Undervoltage and Underfrequency Protection
Adjustable Undervoltage:
Dropout: 78 - 97% of nominal
Pickup: (D2%) to 99% of nominal
Adjustable Underfrequency:
Dropout: 90 - 97% of nominal
Pickup: (D1Hz) to 99% of nominal
5K. All Phase Overvoltage/Overfrequency
Adjustable Overvoltage:
Dropout: 105 - 110% of nominal
Pickup: 103% to (Dropout –2%) of nominal
Adjustable Overfrequency:
Dropout: 103 - 105% 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 dif-
ference between the maximum and minimum phase
voltage, divided by the minimum phase voltage. User-
selectable 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 set-
points 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) pro-
grammed 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
