TP-6714 4/1074 Section 5 Setup
Use the Set System, Source type screen to change the
source types to generator set-generator set or
utility-utility if necessary. The gen-gen type uses two
generator sets and requires the assignment of a second
engine start output. Use the Input/Output Setup screen
to assign one of the main logic board terminal strip or I/O
module outputs to Start Source N Generator, and
connect the engine start leads for the Source N
generator set to the corresponding terminals on the
terminal strip or I/O module terminals. See Section 5.12.
The programmable engine start output remains tied to
the Source N generator set regardless of the preferred
source selection.
The utility-utility source type is designed to use utility
power for both sources. This source type does not use
the engine start outputs.
Time Delays and Source Parameters. Engine start
relays and time delays, source voltage and frequency
trip points, and load shed time delays are assigned to
the source (N or E). They do not change assignment
when the preferred source selection is changed.
Note: Source N is always connected to the Normal side
of the transfer switch, and Source E i s always
connected to the Emergency side.
Other time delays are assigned to the source function
(preferred or standby). System parameters that are
assigned to the function automatically change source
when the preferred source selection changes.
Figure 5-14 shows which parameters are assigned to
the source and which are assigned to the function. The
last two columns of the table show the effect of the
preferred source selection on each parameter or time
delay.
5.11.4 System Voltage and Frequency
For each source, set the number of phases, nominal
voltage, and nominal frequency (50 or 60 Hz). Then
proceed to set the pickup and dropout settings.
Item Assignment
Preferred Source Selection
Normal Emergency
Source N generator engine start relay Source N N
Source E generator engine start relay Source E E
Source N engine start time delay Source N N
Source E engine start time delay Source E E
Source N engine cooldown time delay Source N N
Source E engine cooldown time delay Source E E
Source N voltage and frequency trip points Source N N
Source E voltage and frequency trip points Source E E
In-phase monitor sync Source E E
Pre-transfer to source N Source N N
Pre-transfer to source E Source E E
Post-transfer to source N Source N N
Post-transfer to source E Source E E
Preferred-to-standby time delay Function NtoE EtoN
Standby-to-preferred time delay Function EtoN NtoE
Failure to acquire standby source Function E N
Off-to-standby time delay (programmed-transition only) Function Off to E Off to N
Off - t o-pref erred time delay (programmed-t ransit ion only) Function Off to N Off to E
Note: Source N is connected to the Normal side of the transfer switch, and Source E is connected to the Emergency side.
Figure 5-14 Preferred Source Selection Effect on System Parameters and Time Delays
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