TP-6126 8/02 43Section 6 Accessories
Preferred Source Switch Position
Item Assignment
N E
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
Source N load shed time delays Source N N
Source E load shed time delays Source E E
In-phase monitor synch 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
Pretransfer to preferred signal Function N E
Pretransfer to standby signal Function E N
Post-transfer to preferred signal Function N E
Post-transfer to standby signal Function E N
Off-to-standby time delay (programmed-transition only) Function Off to E Off to N
Off-to-preferred time delay (programmed-transition only) Function Off to N Off to E
Figure 6 -3 Preferred Source Selection Effect on System Parameters and Time Delays
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