IB140036EN
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Instruction Booklet
Effective: October 2014
Page
5
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
Table 2. Transfer Switch Catalog Number Explanation
1.4 Environmental Conditions
1.4.1 Operational Conditions
Normally, an ATS is applied indoors in an electrical equipment
room. In the appropriate enclosure, it can be used for outdoor
applications where the equipment is subject to falling rain, freez-
ing temperatures, and no greater than 90% humidity (non-con-
densing). The ambient temperature range for operation is
between -20 and 70°C (-4 to 158°F).
1.5 Glossary
With respect to their use within this document and as they relate
to transfer switch and controller operation, the following termi-
nology is defined.
Available
A source is defined as “available” when it is within its undervolt-
age/overvoltage/ underfrequency/overfrequency (if applicable)
setpoint ranges for the nominal voltage and frequency setting.
Connected
Connected is defined as when the input is shorted by an external
contact or connection.
Failed or Fails
A source is defined as “failed” when it is outside of the applica-
ble voltage and frequency setpoint ranges for the nominal volt-
age and frequency setting for a time exceeding 0.5 seconds
after the time delay emergency fail (TDEF) time delays expires.
Failsafe
Failsafe is a feature that prevents disconnection from the only
available power source and also forces a transfer or re-transfer
operation to the only available power source.
Source 1
Source 1 is the primary source (normal source, normal power
source, or normal).
Source 2
Source 2 is the secondary source (emergency source, emer-
gency power source, emergency, standby, or backup source).
Source 1: Failed or Fails
Source 1 is defined as “failed” when it is outside of its under-
voltage/overvoltage/ underfrequency/overfrequency (if applica-
ble) setpoint ranges for the nominal voltage and frequency
setting.
Source 2: Failed or Fails
Source 2 is defined as “failed” when it is outside of its under-
voltage/overvoltage/ underfrequency/overfrequency (if applica-
ble) setpoint ranges for the nominal voltage and frequency
setting for a time exceeding 0.5 seconds after the Time Delay
Emergency Fail (TDEF) time delay expires.
Transfer
Transfer is defined as a change of the load connection from the
Source 1 to the Source 2 power source.
Re-Transfer
Re-transfer is defined as a change of the load connection from
the Source 2 to the Source 1.
Unconnected
Unconnected is defined as when the input is not shorted by an
external contact or connection.
Features
The ATC-900 has many features that are available to the user.
These features are standard and are available depending on the
type of transfer switch used (i.e. Contactor, Power Case Switch/
Breaker, or Molded Case Switch/Breaker, 2 or 3 position).
Appendix A of the ATC-900 manual has a list of all of the fea-
tures including any acronyms used along with a brief descrip-
tion. There are many new features in the ATC-900 that are
shown in the ATC-900 manual.
The ATC-900 connections are shown in Figure 16. Some con-
nections, like engine start are wire to a separate terminal block.
POSITIONS 1 TO 2
POSITION 3
POSITION 4
POSITIONS 5 TO 6
BASIC DEVICE
SWITCHING DEVICE
CONTROL PANEL
SWITCHING DEVICE
Automatic Transfer Switch (Open Transition)
AT
Automatic Transfer Switch (Closed Transition)
CT
Contactor
C
ATC-900
Controller
9
3 Position Power Contactor
3 Position w In-Phase to TDN
C3
C5
POSITION 7
POSITION 8
POSITIONS 9 TO 12
POSITION 13
POSITION 14
POSITION 15
SWITCHING DEVICE
ARRANGEMENT
NUMBER
OF POLES
AMPERE
RATING
VOLTAGE/
FREQUENCY
ENCLOSURE
LISTING
Fixed Mount
X
Two (
2
)
40A
–
0040
120 Vac/60 Hz
A
Type
1
S
UL/CSA Listing
U
Three (
3
)
80A
–
0080
208 Vac/60 Hz
B
Type
12
J
No Listing
X
Four (
4
)
100A
–
0100
220 Vac/50 Hz
G
Type 3R
R
150A
–
0150
240 Vac/60 Hz
W
200A
–
0200
380 Vac/50 Hz
H
225A
–
0225
415 Vac/50 Hz
O
260A
–
0260
480 Vac/60 Hz
X
400A
–
0400
600 Vac/60 Hz
E
600A –
0600
800A –
0800
1000A –
1000
1200A –
1200
