11
3.8.2 SEQUENCE 2 - LINE INTERRUPT DELAY
Line interrupt Delay can be set between 0 and 60 seconds. •
Factory default setting is 2 seconds.
If voltage dropout lasts longer than the Line Interrupt Delay set-•
ting, the generator start sequence will start.
Once the Generator voltage reaches Load Accept Voltage and •
Load Accept Frequency this will trigger Sequence 3.
3.8.3 SEQUENCE 3 - ENGINE MINIMUM RUN AND
ENGINE WARMUP TIMERS
Engine Minimum Run timer starts. The Engine Minimum Run •
timer can be set from 5 to 30 minutes. Factory default setting
is 5 minutes.
Engine Warmup timer starts. The Engine Warmup timer can •
be set from 0 to 1,200 seconds. Factory default setting varies
depending on the engine used.
Standby Operating LED, on front of door, is ON.•
The expiration of the Engine Warmup timer triggers sequence •
4.
3.8.4 SEQUENCE 4 - SIGNAL BEFORE TRANSFER
Signal Before Transfer timer does not operate in a Utility Fail •
sequence.
Sequence 5 starts immediately.•
3.8.5 SEQUENCE 5 - ATS TRANSFER TO GENERATOR
POSITION
ATS transfer mechanism operates to connect the Customer •
Load to the Generator supply. Customer Load will be supplied
from the Generator until sequence 6 is initiated.
Generator Switch Position LED, on front of door, is ON.•
3.8.6 SEQUENCE 6 - UTILITY VOLTAGE PICKUP
The ATS controller continues to monitor the Utility source volt-•
age. When the Utility voltage is above the voltage dropout set-
ting plus the hysteresis value, sequence 7 will be initiated.
3.8.7 SEQUENCE 7 - RETURN TO UTILITY TIMER
Return to Utility timer starts. The Utility source voltage must •
stay above the pickup level. If the Utility voltage falls below the
pickup value, the Return to Utility timer is reset. The Return to
Utility timer can be set from 1 to 30 minutes. Factory default
setting is 1 minute.
The expiration of the Return to Utility timer triggers sequence •
8.
3.8.8 SEQUENCE 8 - SIGNAL BEFORE TRANSFER
Signal Before Transfer timer starts. The Signal Before Transfer •
relay is energized for the duration of the timer. The Signal Before
Transfer timer can be set from 0 to 30 seconds. Factory default
setting is 2 seconds.
The expiration of the Signal Before Transfer timer triggers •
sequence 9.
3.8.9 SEQUENCE 9 - ATS TRANSFER TO UTILITY
POSITION
ATS transfer mechanism operates to connect the Customer •
Load to the Utility supply. Customer Load will be supplied from
the Utility.
The connection of the Customer Load to the Utility source trig-•
gers sequence 10.
Utility Switch Position LED, on front of door, is ON.•
Section 3 — Operation
HTS “Wn” Type Transfer Switch
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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