Specifications

Distribution Products Catalog CA08101001E—October 2010 www.eaton.com 85
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16.5
Tr a n s f er Switches
ATC Controllers
In-Phase Transfer
Feature Set 47D
Closed Only
ATC-800 controllers
equipped with Feature Set
47D only transfer to an
alternate source when both
sources are synchronized.
For synchronization to occur,
both voltage and frequency
differentials must fall within
the user-selectable ranges. If
synchronization does not
occur (within a preselected
amount of time), the
controller will maintain load
connection to the current
power source and initiate
an alarm.
Closed Transition
With Default to In-Phase
Transition With Default
to Time Delay Neutral
Provides a closed transition
transfer as the primary
transfer mode. In the event
Source 1 and Source 2 fail
to synchronize within the
permitted voltage difference,
frequency difference, phase
angle difference and time,
then the controller defaults
to the In-phase transition
with default to time delay
neutral operation as
described in Features 32D
and 32A. Adjustable
frequency difference
0.0–0.3 Hz. Adjustable
voltage difference
1–5% volts. Adjustable
synchronization time
allowance 1–60 minutes.
Feature Set 47D Schematic
Closed Transition Standard Features
Feature Set 47F Closed/
Load Voltage Decay
ATC-800 controllers equipped
with Feature Set 47F will
perform a closed transition
when both sources are
synchronized in frequency,
phase and voltage. Failure to
synchronize will result in an
open transition Time Delay
Load Voltage Decay transfer.
Time Delay Load Voltage
Decay uses the load voltage
measurements to sense back
EMF that is generated when
the transfer switch is in the
Neutral position. It provides
a delay in transfer in either
direction if an unacceptable
level is sensed as established
by a customer programmed
level. The transfer will not
take place until the back EMF
decays below the acceptable
programmed level. This
feature has a separate setting
of enabling or disabling the
operation. If disabled, the
transfer switch will not delay
in the Neutral position and
will transfer between the
sources as fast as possible.
This feature is not available
with the Time Delay Neutral
Optional Feature 32A,
Feature Set 47G Closed/
Time Delay Neutral
ATC-800 controllers equipped
with Feature Set 47F will
perform a closed transition
transfer when both sources
are synchronized in
frequency, phase and
voltage. Failure to
synchronize will result in an
open transition Time Delay
Neutral transfer. Time Delay
Neutral provides a time delay
in the transfer switch neutral
position when both sources
are open. This delay takes
place when the load is
transferred in either direction
to prevent excessive in-rush
currents due to out-of-phase
switching of large motor
loads.
Standard Features Customer Adjustments
Closed transition frequency difference (Hz) 0.0–0.3 Hz
Closed transition voltage difference 1–5%
Closed transition synchronization timer 1–60 minutes
Request for Transfer
Alternate
Source
Available?
Sources
Synchronized
<Tmax
Source 1 Open
<100 msec?
Close Source 2
Open Source 1
Detect Source 2 Closed
Good
Open Source 2
Alarm
Alarm
End End
Yes
Yes
Yes
No
No
No
Closed
Transition