Specifications

IB01602019E For more information visit: www.eatonelectrical.com
Instructional Booklet
Effective: May 2006 Page 9
O&M Manual for the Eaton ATC-100
Automatic Transfer Switch Controller
2.6 Specification Summary
Table 1. ATC-100 Specifications.
Section 3: Operation
3.1 General
This section specifically describes the operation and functional
use of the ATC-100 . The practical use of and operation within
each category will be discussed. In this section, it is assumed
that prior sections of this manual were reviewed and that the
operator has a basic understanding of the hardware.
The ATC-100 provides for automatic transfer and re-transfer from
source to source. It provides a summary of the ATC-100 intelli-
gence and supervisory circuits that constantly monitor the condi-
tion of both the utility and generator power sources, thus
providing the required intelligence for transfer operations. These
circuits, for example, automatically initiate an immediate transfer
of power when the power fails or the voltage level drops below a
preset value.
3.2 Operating Voltage and Measurements
The ATC-100 operates with control power from 95 to 145 Vac
(120 Vac ± 20%). The ATC-100 operates on single and 3-phase sys-
tems with selectable frequency settings of 50 or 60 Hz.
The ATC-100 can perform the time delay engine start function
without control power.
The ATC-100 operates directly from the line sensing inputs of the
utility and generator power sources. The nominal operating sys-
tem input is jumper-selectable from 120 to 480 Vac. The stan-
dard system assumes that neutral is available and that the
switching device can therefore be powered from an available
120 Vac source. If a neutral conductor is not available,120 Vac
is created by an external transformer.
All voltage monitoring and measurements are true RMS measure-
ments.
3.3 Typical Transfer Operation
A typical transfer request will begin with a utility outage (utility
voltage falls below the 80% dropout level), a System Test, or a
Generator Test with Load Transfer. After Time Delay Engine Start
(TDES) times out, the Generator Start relay will energize which
closes its Normally Open contacts and opens its Normally Closed
contacts.
When the generator source meets the requirements to be consid-
ered available, the Time Delay Normal to Emergency (TDNE) timer
will start timing. After TDNE times out, the K2 relay contacts will
close until the Generator Connected input is closed. Once the
Generator Connected input is satisfied (load is connected to gen-
erator), the K2 relay contacts will open.
When the utility becomes available (utility voltage is above the
90% pickup level), the Time Delay Emergency to Normal (TDEN)
timer will start timing. After TDEN times out, the K1 relay con-
tacts will close until the Utility Connected input is closed. Once
the Utility Connected input is satisfied (load is connected to util-
ity), the K1 relay contacts will open and the Time Delay Engine
Cooldown (TDEC) timer will start timing. When TDEC times out,
the Generator Start relay will de-energize which opens its Nor-
mally Open contacts and closes its Normally Closed contacts.
3.4 Test Modes
There are three test modes:
1. Engine Start – a no load generator test;
2. System Test – a generator test with load transfer; and
3. Generator Test – a programmed generator test with or
without load transfer.
Input Control Voltage 95 to 145 Vac 50/60 Hz
Voltage Measurements of Utility VAB Generator VAB
Utility VBC Generator VBC
Utility VCA Generator VCA
Voltage Measurement Range 0 to 575 Vac RMS (50/60 Hz)
Voltage Measurement Accuracy ± 1% of Full Scale
Frequency Measurements of Generator
Frequency Measurement Range 40 Hz to 70 Hz
Frequency Measurement Accuracy ± 0.3 Hz Over the Measurement Range
Undervoltage Dropout 80% of the Nominal System Voltage
Undervoltage Pickup 90% of the Nominal System Voltage
Underfrequency Dropout Range 90% of the Nominal System Frequency
Underfrequency Pickup Range 95% of the Nominal System Frequency
Overfrequency Dropout Range 115% of the Nominal System Frequency
Overfrequency Pickup Range 110% 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 Relays 10 A, 1-3 HP @ 250 Vac
10 A @ 30 Vdc
Applicable Testing UL Recognized Component
UL 1008, UL 991 Environmental
IEC 61000-4-2, 61000-4-3, 61000-4-4, 61000-4-5,
61000-4-6, 61000-4-11
CISPR 11, Class B
FCC Part 15, Class B
Enclosure Compatibility NEMA 1, NEMA 3R, and NEMA 12
UV Resistant ATC-100 Faceplate