Specifications

February 2007
CA08101001E For more information visit: www.eaton.com
16-49
Transfer Switches
16
Transfer Switch Equipment
Transfer Switch — Standard and Optional Features
Transfer Switch — Standard and
Optional Features (Continued)
18S. IQ DP-4000 — Source 2 Line
Side Metering
Provides an IQ DP-4000 for monitoring
the Source 2 line side circuit.
18T. IQ DP-4000 With Selector Switch
for Source 1 or Source 2 Line Side
Metering
Provides an IQ DP-4000 with a Source
selector switch for monitoring the
Source 1 or Source 2 line side circuit.
18U. IQ DP-4000 — Load Side Metering
Provides an IQ DP-4000 for monitoring
the load side circuit.
18V. IQ Analyzer — Load Side Metering
Provides an IQ Analyzer for monitoring
the load side circuit.
18W. Ammeter Side Metering
Provides an ammeter for monitoring
the load side circuit.
20A. Rear Bus Provisions
Provides Source 1, Source 2 and
Load Circuit rear accessible bus stabs
with provision for busbar connection.
Cutler-Hammer Transfer Switches are
provided with either front or rear
(dependant on switch type) connected
solderless screw-type terminals for
power cable connection as standard.
21A. Optional Power Cable Connection
Terminals
Cutler-Hammer Transfer Switches are
provided as standard with Source 1,
Source 2 and Load Circuit solderless
screw-type terminals for power cable
connection. Alternate terminal wire
sizes, and compression lug provisions
may be available dependant on transfer
switch type and ampere rating.
32. Delayed Transition Transfer Modes
for Open Transition Transfer Switches
Provides delayed transition transfer
modes for an open transition transfer
switch. Often used in systems with
inductive loads, a delayed transition
transfer switch may prevent or reduce
inrush currents due to out of phase
switching of inductive loads.
32A. Time Delay Neutral
Provides a time delay in the neutral
position during the transfer and
re-transfer operations during which
both Source 1 and Source 2 are dis-
connected from the load circuit. This
allows inductive loads time to reach a
safe voltage and eliminate back EMF.
The time delay is programmable and
is the same for both transfer and re-
transfer operations. This is a passive
feature which requires the consulting
Eng./installer to determine the settings
based on how the user will operate the
facility. Adjustable 0 – 120 seconds.
32B. Load Voltage Decay
Provides load voltage measurement
to sense back EMF that is generated
when the transfer switch is the neutral
position. It provides a delay in transfer
in either direction if an unacceptable
level is sensed as established by a pro-
grammed set point. This is an active
feature that adapts to how the facility
is operating in order to minimize neutral
position wait time, but ensure safety.
Adjustable 2 – 30% of nominal voltage.
32C. In-Phase Transition With Default
to Load Voltage Decay
Provides In-Phase transition, which is
a feature that will permit a transfer or
re-transfer between 2 available sources
that have a phase angle difference
near zero. The In-Phase transition
feature includes permissible frequency
difference and synchronization time
set points. In the event Source 1 and
Source 2 fail to synchronize within the
permitted frequency difference and
time, then the controller defaults to the
Load Voltage Decay operation as
described in Feature 32B. Adjustable
Frequency Difference 0.0 – 3.0 Hz.
Adjustable Synchronization Time
Allowance 1 – 60 minutes.
32D. In-Phase Transition With Default
to Time Delay Neutral
Provides In-Phase transition, which is
a feature that will permit a transfer or
re-transfer only between 2 available
sources that have a phase angle differ-
ence near zero. The In-Phase transition
feature includes permissible frequency
difference and synchronization time
set points. In the event Source 1 and
Source 2 fail to synchronize within the
permitted frequency difference and
time then the controller defaults to the
Time Delay Neutral operation as
described in Feature 32A. Adjustable
Frequency Difference 0.0 – 3.0 Hz.
Adjustable Synchronization Time
Allowance 1 – 60 minutes.
32F. In-Phase Transition
Provides In-Phase transition, this
feature will permit a transfer or re-
transfer between 2 available sources
that have a phase angle difference of 8
degrees or less. The In-Phase transition
feature includes permissible frequency
difference and synchronization time
set points. In the event Source 1 and
Source 2 fail to synchronize within the
permitted frequency difference and
time, the Alarm relay will energize and
“Failed to Sync” will be displayed on
Line 1 of the controller. After resetting
the alarm, another in-phase transition
may be attempted or a non-synchronized
transfer may be initiated by failing the
connected source. The adjustable fre-
quency difference is 0.0 to 3.0 Hz. If the
synchronization does not occur within
a specified amount of time, the Alarm
relay will energize and the failure will
be logged into the Transfer History
as either “Sync Fail - Freq” or “Sync
Fail - Phase” depending on whether
the frequency difference or the phase
difference was excessive.
47. Transfer Modes for Closed
Transition Transfer Switches
Provides available transition transfer
modes for a closed transition transfer
switch. Closed Transition is a “make
before break” transfer and re-transfer
scheme that will parallel (a maximum
of 100 ms) Source 1 and Source 2
providing a seamless transfer when
both sources are available. The closed
transition feature includes permissible
voltage difference frequency difference
and synchronization time allowance
set points. The phase angle difference
between the 2 sources must be near
zero for a permitted transfer. These are
all programmable set points in the
controller.
47C. Closed Transition With Default to
In-Phase Transition With Default to
Load Voltage Decay
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 Load Voltage Decay opera-
tions as described in Features 32C and
32B. Adjustable Frequency Difference
0.0 – 0.3 Hz. Adjustable Voltage Difference
1 – 5 percent V. Adjustable synchroni-
zation Time Allowance 1 – 60 minutes.