Specifications

February 2007
CA08101001E For more information visit: www.eaton.com
16-59
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)
Return of Normal Power — Breaker Open
Transition Logic Selected
When normal source has been
restored and is within the pre-selected
ranges for voltage and frequency and
after a time delay to ensure the integ-
rity of the normal power source, the
load shall be transferred back to nor-
mal source in a break-before-make
transfer scheme. The generator set will
continue to run for a user adjustable
time to allow the generator set to run
unloaded for cool down, after which
the engine will be shut down. Upon
completion the system will then be
ready for automatic operation.
Return of Normal Power — Breaker Closed
Transition Logic Selected
When the normal source has been
restored and is within the pre-selected
ranges for voltage and frequency, and
after an adjustable time-delay to
ensure the integrity of the normal
source, the load shall be transferred
back to the normal source in a make-
before-brake transfer scheme.
On completion of the time delay, the
generator set bus will automatically
synchronize with the utility service
across the Source 1 (normal) breaker.
When the two systems are synchro-
nized, the Source 1 (normal) breaker
will close and the Source 2 (emer-
gency) breaker will open. The genera-
tor set will continue to run for a user
adjustable time to allow the generator
set to run unloaded for cool down,
after which the engine will be shut
down. Upon completion the system will
then be ready for automatic operation.
Return of Normal — Breaker Interchange
(Soft Load) Logic Selected
When the normal source has been
restored and is within the pre-selected
ranges for voltage and frequency, and
after an adjustable time-delay to
ensure the integrity of the normal
source, the load shall be transferred
back to the normal source in a make-
before-brake transfer scheme. On
completion of the time delay, the gen-
erator set bus will automatically syn-
chronize with the utility service across
the Source 1 (normal) breaker. When
the two systems are synchronized, the
Source 1 (normal) breaker will close
and the generator set will gradually
transfer all loads to the utility.
On completion of the load transfer
sequence the Source 2 (emergency)
breaker will open. The generator set
will continue to run for a user adjust-
able time to allow the generator set to
run unloaded for cool down, after
which the engine will be shut down.
Upon completion the system will then
be ready for automatic operation.
Peak Shaving
The closed transition soft load transfer
switch can be factory configured to
automatically parallel to the utility. In
this operation mode, the switch will be
paralleled with the utility when the
user adjustable load power level is
exceeded for the predetermined
amount of time.
Test Mode Operation
Engine Run Test Mode
To perform an engine run test, first
place the System Test switch in the
“Run” position. Next place the Auto/Test
switch in the “Test” position. The engine
start contact will close, the engine will
start and the generator will produce
nominal voltage and frequency.
Neither Source 1 nor Source 2 breaker
will be operated.
Returning either the System Test to
“Off” position or Auto/Test switch to
“Auto” position will remove the
“Engine Start” command. The engine
will shut down.
Transfer Test Mode (Open Transfer)
Note: This operation is carried out when the
controller’s Breaker Logic is programmed
for Open Transition via ATC-5000 Input 64.
To perform an open transition test, first
place the Test Mode selector switch in
the “Mode 1” position, followed by
placing the System Test switch in
“Test” position followed by placing
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 Source 1 (normal) breaker
will open and the Source 2 (emergency)
breaker will close on the dead bus.
Returning either the Auto/Test selector
switch to “Auto” position or the Test
Mode selector switch to “Off” position
will cause the system to return to nor-
mal power as described in “Return Of
Normal Power — Breaker Open Transi-
tion Logic Selected.”
Transfer Test Mode (Closed Transition)
Note: This operation is carried out when the
controller’s Breaker Logic is changed
to
Closed Transfer via ATC-5000 Input 64.
To perform a closed transition test, first
place the Test Mode selector switch in
the “Mode 2” position, 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
generator bus will be synchronized to
the utility across the Source 2 (emer-
gency) breaker. When the two sources
are synchronized the Source 2 (emer-
gency) breaker closes and then Source
1 (normal) breaker opens.
Returning either the Auto/Test selector
switch to “Auto” position or the
System Test selector switch to “Off”
position will cause the system to
return to normal power as described in
“Return Of Normal Power — Breaker
Closed Transition Logic Selected.”
Transfer Test Mode (Interchange —
Soft Load Transition)
This operation is carried out when the
controller’s Breaker Logic is programmed
for Interchange (Soft Load Transition).
To perform an interchange (soft load
transition) test, first place the Test Mode
selector switch in the “Mode 1” position,
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 generator 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 all load. On completion of the
load transfer sequence the Source 1
(normal) breaker will open.
Returning either the Auto/Test selector
switch to “Auto” position or the Sys-
tem Test selector switch to “Off” posi-
tion will cause the system to return to
normal power as described in “Return
of Normal Power (Switch in Closed
Transition Mode).”
Paralleling Test Mode (Baseload)
This operation is carried out when the
controller’s Breaker Logic is changed
to Parallel via ATC-5000 Input 64 and
the Baseload operation is selected.
To perform a paralleling test in a base
load mode, first place the Test Mode
selector switch in the “Mode 2” position,
followed by placing the System Test
switch in “Test” position followed by
placing the Auto/Test selector switch in