Specifications

I.B. ATS-I005
Page 4
Effective 6/00
Standard Feature: Time Delay Emergency to
Normal (TDEN)
TDEN delays the transfer to the Normal Source to per-
mit stabilization of the Normal power source before the
transfer is made. This timer will begin the countdown
from its setting value when the Normal Source becomes
available. During the countdown of this timer, if the
Normal Source should become unavailable, the timer
will be aborted. If the Preferred Source is available and
the Emergency Source fails while the TDEN timer is
counting down, the TDEN timer will be bypassed.
Standard Feature: Time Delay for Engine Cool-Off
(TDEC)
TDEC permits the generator to run under a no-load con-
dition after a transfer from the generator source has
been made. Countdown timing begins when the transfer
is completed. In applications where two generators are
selected, the same cool-off timer setting value is used
for both.
Standard Feature: Time Delay Emergency Failure
(TDEF)
TDEF is used where at least one source is an engine
generator. TDEF will delay an available source from
being declared unavailable in order to override momen-
tary generator fluctuations. This time delay is only imple-
mented when the load is connected to a generator
source. TDEF is not displayed when the number of gen-
erators is zero.
CHANGING THE SYSTEM NOMINAL VOLTAGE OR
FREQUENCY SETPOINTS WILL CAUSE PICKUP
AND DROPOUT SETPOINTS TO CHANGE AUTO-
MATICALLY TO NEW DEFAULT VALUES.
Standard Feature : System Nominal Frequency
(NOMF)
There are only two choices for system nominal frequen-
cy of the distribution system, 50 or 60 Hertz. The
dropout/pickup, underfrequency and overfrequency
upper and lower setting limits are based on the nominal
frequency value.
Standard Feature: System Nominal Voltage (NOMV)
This refers to the standard system nominal RMS line to
line voltage. A wide range (120 to 600) of sensing volt-
age is available to be programmed. The dropout/pickup,
undervoltage and overvoltage upper and lower setting
limits are based upon the nominal voltage value.
Standard Feature: Undervoltage Monitoring for
Source 1 (1UVD, 1UVP)
This feature constantly monitors Source 1 for an under-
voltage condition. When the Source 1 voltage drops to a
value equal to or below the undervoltage dropout set-
ting, the source will become unavailable. The source’s
voltage will then have to rise to a value that is equal to
or above the pickup setting to become available again.
Standard Feature: Undervoltage Monitoring for
Source 2 (2UVD, 2UVP)
This feature functions the same as Standard Feature
(1UVD, 1UVP), except for Source 2 instead of Source 1.
Standard Feature: Underfrequency Monitoring for
Source 2 (2UFD, 2UFP)
This feature functions the same as Optional Feature
26E, except for Source 2 instead of Source 1.
Standard Feature: Commit to Transfer During TDNE
Timing (CTDNE)
This feature provides for selection as to whether or not
commitment to transfer is desired when Time Delay
Normal to Emergency countdown has begun. If no
commitment is chosen and the Normal Source returns
to availability when the TDNE timer is counting down,
the transfer is aborted and the engine generator (if
applicable) is cooled down.
Standard Feature: Engine Test Mode (TMODE)
This feature provides selection of the type of test that
can be initiated by the front panel Engine Test pushbut-
ton. An engine test without transferring the load to it, or
an engine test with a full transfer of the load to the
engine can be chosen. Load testing is fail-safe. If the
generator fails during testing for any reason, the IQ
Transfer will signal the transfer switch to return to nor-
mal. If disable test mode is chosen, the front panel
pushbutton cannot be used to initiate a test.
Standard Feature: Test Engine Run (TER)
This feature provides selection of the length of time in
hours and minutes that the IQ Transfer will enable the
generator contacts during an Engine Test that was initi-
ated from the front panel pushbutton or for the plant
exerciser feature, if applicable.
Optional Feature 5C: Overfrequency Monitoring for
Source 2 (2OFD, 2OFP)
This feature functions the same as Optional Feature
26F, except for Source 2 instead of Source 1.
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CAUTION