Operation
Automatic Transfer Switch Owner’s Manual 19
4.7.1— Signal Before Transfer
The Signal Before Transfer option includes a signal relay,
customer connection terminal strip and the associated
wiring. See Figure 4-8.
Figure 4-8. Signal Before Transfer
The logic for this option is a part of the G/H-panel control-
ler. The delay time is adjustable from 0 to 30 seconds.
Set the timer to “0” when this option is not desired.
The basic operation of the option is to delay (for the
period of time set) the transfer of the HTS mechanism
while a signal relay (SR) is energized. When the relay is
energized, two sets of the dry contacts (wires 236 and
240, and 237 and 238) are closed. These dry contacts
can be connected to, via a terminal strip located on the
bottom of the subplate. Reference wiring diagram
0F5520 or 0F5036 for further details. The customer con-
nections are made on terminal strip TB3-1.
NOTE: This delay is not active on a Normal source failure.
Transfer during Normal source failure is immediate.
NOTE: The “Signal Before Transfer” feature provides a time
delay that allows elevators to continue operating before transfer
to another power supply occurs.
Summary of Parameters
Parameter Range Default Value
Utility Voltage Deviation 0 - 25 Vrms +/- 25 Vrms
Line Interrupt Delay 0 - 60 seconds 2 seconds
Minimum Run Timer 5 - 30 minutes 5 minutes
Engine Warmup Timer 0 - 1,200 seconds Engine dependent
Load Accept Voltage 85 - 95% of nominal 90% of nominal
Load Accept Frequency 85 - 95% of nominal 95% of nominal
Signal Before Transfer Timer 0 - 30 seconds 2 seconds
Time Delay Neutral Timer 0 - 10 seconds 2 seconds
Utility Voltage Hysteresis 2 - 25 Vrms 10 Vrms
Return To Utility Timer 1 - 30 minutes 1 minute
Engine Cooldown Timer 0 - 1,200 seconds Engine dependent
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