Generac Power Systems HTS User Manual

Operation
18 Automatic Transfer Switch Owner’s Manual
second utility loss timer and a 30 second utility
return timer.
• Voltage dropout triggers sequence 2.
4.6.2— 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 Inter-
rupt delay setting, the generator start sequence is
activated.
• Once the Generator voltage reaches Load Accept
Voltage and Load Accept Frequency this will trig-
ger Sequence 3.
4.6.3— Sequence 3 - Engine Minimum Run and
Engine Warmup Timers
•
Engine Minimum Run timer starts. The Engine Min-
imum 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.
4.6.4— Sequence 4 - Signal Before Transfer
•
Signal Before Transfer timer does not operate in a
Utility Fail sequence.
• Sequence 5 starts immediately.
4.6.5— 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.
4.6.6— Sequence 6 - Utility Voltage Pickup
•
The ATS controller continues to monitor the Utility
source voltage. When the Utility voltage is above
the voltage dropout setting plus the hysteresis
value, Sequence 7 will be initiated.
4.6.7— Sequence 7 - Return to Utility Timer
•
Return to Utility timer starts. The Utility source volt-
age 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.
4.6.8— 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.
4.6.9— 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 triggers sequence 10.
• Utility Switch Position LED, on front of door, is ON.
4.6.10— Sequence 10 - Engine Cooldown Timer
•
Engine Cooldown timer starts The Engine
Cooldown timer can be set from 0 to 1,200 sec-
onds. Factory default setting varies depending on
the engine used.
• The engine generator will shutdown when the
Engine Cooldown timer and the Engine Minimum
Run timer expires.
NOTE: At the conclusion of sequence 10 the system
is armed and ready for the next Utility failure or exer-
cise sequence.
4.7 — Transfer Switch Options
The transfer switch may be equipped with one or more of
the following options:
• Signal Before Transfer
• Instrument Package
• NEMA 3R, 4, 4X or 12 enclosure

Generac Power Systems HTS Specifications

General

Brand	Generac Power Systems
Model	HTS
Category	Switch
Language	English