Specifications

February 2007
16-60
For more information visit: www.eaton.com CA08101001E
Transfer Switches
16
Transfer Switch Equipment
Magnum Closed Transition Soft Load Transfer Switch with ATC 5000 Controller
Magnum Closed Transition Soft
Load Transfer Switches with
ATC 5000 Controller (Continued)
the “Test” position. After an adjustable
time delay, the generator will start.
After the nominal voltage and fre-
quency are reached, the generator bus
will be synchronized to the utility
across the Source 2 (emergency)
breaker. When the two sources are
synchronized the Source 2 (emer-
gency) breaker is closed and the gen-
erator gradually assumes load up to
the user programmable power level
and then continuously maintains its
power output.
Returning either the Auto/Test selector
switch to “Auto” position or the
System Test selector switch to “Off”
position will cause the generator to
gradually unload and then the Source
2 (emergency) breaker will open. The
generator set will continue to run for
a user adjustable time allowing the
generator set to run unloaded for cool
down, after which the engine will be
shut down. Upon completion the sys-
tem will then be ready for automatic
operation.
Paralleling Test Mode (Import/Export)
This operation is carried out when the
controller’s Breaker Logic is changed
to Parallel (via ATC-5000 Input 64 and
the Import/Export operation is selected.
To perform a paralleling test in Import/
Export mode, first place the Test Mode
selector switch in the “Mode 2” posi-
tion, followed by placing the System
Test switch in “Test” position followed
by placing the Auto/Test selector
switch in the “Test” position. After an
adjustable time delay, the generator
will start. After the nominal voltage
and frequency are reached, the gener-
ator bus will be synchronized to the
utility across the Source 2 (emergency)
breaker. When the two sources are
synchronized the Source 2 (emergency)
breaker is closed and the generator
gradually assumes load up to the user
programmable import (adjustable
power setting for power supplied from
the utility) or export (adjustable power
setting for power supplied to the util-
ity) power level and then continuously
varies its power output to maintain the
selected power flow.
Returning either the Auto/Test selector
switch to “Auto” position or the
System Test selector switch to “Off”
position will cause the generator to
gradually unload and then the Source
2 (emergency) breaker will open. The
generator set will continue to run for
a user adjustable time allowing the
generator set to run unloaded for cool
down, after which the engine will be
shut down. Upon completion the sys-
tem will then be ready for automatic
operation.
Figure 16-21. Sequence Flow Chart — Soft Load ATS

Or switch SYSTEM TEST selector switch to OFF.
AUTO/TEST
Loss of
Normal Source
Auto Test
Start Engine
Transfer Load
to Generator —
Open Transfer
Utility Returns
Transfer Load
to Utility —
Soft Transfer
Stop Engine
after Cool Down
End
TEST MODE
Start Engine
Transfer Load
to Generator —
Soft Transfer
Transfer Load
to Utility —
Soft Transfer
End
SYSTEM TEST
Tes t
Off
Run
Off Start Engine
Stop Engine
AUTO/TEST
TestAuto
햲
End
Engine Continues
to Run
Breaker Logic —
Interchange
(Soft Load/Unload)
Breaker Logic —
Interchange
(Soft Load/Unload)
Start Engine
Transfer Load
to Generator —
Open Transfer
Transfer Load
to Utility —
Open Transfer
Stop Engine
after Cool Down
End
Breaker Logic —
Open Transfer
Start Engine
Transfer Load
Generator —
Closed to Transfer
Breaker Logic —
Closed Transfer
Mode 1 Mode 2
OR
AUTO/TEST
Tes tAuto
햲
Load Stays on
Generator
Transfer Load
to Utility —
Closed Transfer
Stop Engine
after Cool Down
End
AUTO/TEST
Tes tAuto
햲
Load Stays
on Generator
Synchronize
Generator
to Utility
AUTO/TEST
Tes tAuto
햲
Load Stays
on Generator
Synchronize
Generator
to Utility
Synchronize
Generator
to Utility
Synchronize
Generator
to Utility
Stop Engine
after Cool Down