IB01602019E
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Instructional Booklet
Effective: March 2010
Page
11
O&M Manual for the Eaton ATC-100
Automatic Transfer Switch Controller
Output Relay K2
This relay is used
to control transfer switch position
. Only the Form
A contact is available for connection.
This output is used to close the generator switching device. The
K2 relay momentarily energizes until the ATC-100 senses that the
generator switching device is closed, then K2 de-energizes. The
K2 outputs are the Common Pin (J-4, Pin 6) and Normally Open
Pin (J-4, Pin 7) (see Figure 4).
Note:
The ATC-100 MUST BE properly grounded at J-4, Pin 8 for proper
operation.
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
systems 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. If TDN is enabled, the K2 relay contacts will open when the
Utility Connected input is open (load is disconnected from utility).
TDN will then time out and the K2 relay contacts will close until
the Generator Connected input is closed. Once the Generator
Connected input is satisfied (load is connected to generator), 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. If TDN is enabled, the K1 relay contacts will open
when the Generator Connected input is open (load is discon-
nected from generator). TDN will then time out and the K1 relay
contacts will close until the Utility Connected input is closed.
Once the Utility Connected input is satisfied (load is connected to
utility), 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.
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
