c.
Programmable exerciser time to allow automatic starting of the
generator sets and subsequent load transfer to each generator set.
Exercise periods shall be selectable for 1 to 24 hours per day for 0 to
7 days a week.
][2.1.2.3
Controls for Preferred Utility Source Automatic Transfer Switch
**************************************************************************
NOTE: The following paragraph is intended for use
when the automatic transfer switch is to be used for
selecting between two utility sources (preferred and
alternate).
**************************************************************************
Provide all the necessary controls to transfer the load to the alternate
utility source upon loss of the preferred utility source and re-transfer
the load to the preferred utility source when the preferred utility source
returns. The switch shall include the following control features.
a.
Three-phase preferred and alternate source voltage sensing circuit with
adjustable dropout, 75-98 percent of nominal, and pick-up, 85-100
percent of nominal.
b.
Re-transfer to normal source time delay, adjustable 1-30 minutes.
**************************************************************************
NOTE: When the transferred load includes
motors(over 50 HP or over 5 HP without significant
resistive loads) select the following option.
**************************************************************************
[c.
Adjustable time delay transition or in-phase monitor feature for
indicated transfer switches to allow safe transfer of highly inductive
loads between two non-synchronized sources.]
][2.1.2.4
Controls for Fire Pump Service Automatic Transfer Switch
**************************************************************************
NOTE: The following paragraph is intended for use
when the automatic transfer switch is to be used for
fire pump service.
**************************************************************************
Provide the following additional controls features:
a.
Phase reversal of the normal source shall initiate transfer to the
emergency/alternate source.]
2.1.3
Front Panel Devices
Provide devices mounted on cabinet front consisting of:
a.
Mode selector switch with the following positions and associated
functions;
1.
TEST - Simulates loss of normal/preferred source system operation.
2.
NORMAL - Transfers system to normal/preferred source bypassing
SECTION 16410N
Page 9
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