Specifications

84 Distribution Products Catalog CA08101001E—October 2010 www.eaton.com
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16.5
Tr a n s f er Switches
ATC Controllers
Operation
The ATC-800 operates in
the following modes to meet
most load management
applications:
●
Loss of normal power
●
Open transition to
alternate source
●
Normal power restored
●
Closed transition back
to normal source
●
Peak shave (remote or
local) closed transition to
and from alternate source
●
Test (user selectable)
●
Load transfer—closed
transition to and from
alternate source
●
No-load transfer—starts
alternate power source
and allows to run
unloaded. No transfer
takes place
Programming and Options
Closed Transition
Operation Modes
Feature Set 47C Closed/In-
Phase/Load Voltage Decay
ATC-800 controllers
equipped with Feature Set
47C execute the following
sequence of operations
upon receipt of a request
for transfer: the controller
waits (for a preselected time
frame) for synchronization
of voltage and frequency. If
achieved, a closed transition
transfer occurs. Failure to
synchronize results in the
controller defaulting to
an in-phase monitor, open
transition mode of operation.
If the two sources fail
to achieve frequency
synchronization within the
user-selectable range, the
controller defaults to an
open transition using
a load voltage decay
delayed transition.
Feature Set 47C Schematic
Closed Transition/In-Phase Standard Features
Standard Features Customer Adjustments
Closed transition frequency difference (Hz) 0.0 to 0.3 Hz
Closed transition voltage difference (V) 1–5%
In-phase transition frequency difference (Hz) 0.0–0.3 Hz
Closed transition synchronization timer 1–60 minutes
In-phase transition synchronization timer 1–60 minutes
Request for Transfer
Alternate
Source
Available?
Sources
Synchronized
<Tmax
Both Sources
Still Available
Sources
Synchronized
<Tmax
Source 1 Open
<100 msec?
Close Source 2
Open Source 1
Detect Source 2 Closed
Good
Open Source 2
Alarm
Open Source 1
Close Source 2
Open Source 1
Load Voltage Decay
Close Source 2
End End End
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Open Transition/
In-phase Monitor
Closed
Transition
Open
Transit
Delayed