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SECTION 1 - INTRODUCTION
1.1 General Description
The OVATION™ Series Automatic Transfer Switch (ATS) system, used in conjunction with a standby generator, provides a
convenient, economical way to maintain power in a home or business during a utility outage. The transfer switch senses when
utility power is lost, starts a permanently installed generator and transfers the connected loads to generator power, reversing the
sequence when utility power is restored.
Each OVATION™ Series ATS is tested and shipped from the factory with the following:
• Two-pole service disconnect circuit breaker mechanically interlocked with generator source circuit breaker
• Microprocessor based controller module with user display panel (UID).
• Sub-panel for installing and connecting branch circuit breakers (branch circuit breakers sold separately).
• Relay Kit (Model ATSRK) to connect certain stationary generators to the ATS
• Options:
o The Control Module can accept up to 3 PowerPause™ Load Management modules (sold separately),
together with PowerPause™ Relay Boxes to dynamically manage up to six 240 VAC, up to 50A loads (or up
to 12 120VAC loads).
o A surge protection module can be factory or field installed.
o 22K AIC rated utility circuit breakers can be factory installed.
Transfer switches are used to protect critical electrical equipment and appliances against the loss of utility power. The appliance’s
normal power source is the utility, backed up by a secondary (generator) power source. The transfer switch is connected to both the
utility and generator sources and supplies the appliance with power from either the normal or secondary source. In the event that
the power is lost from the normal source (utility), the transfer switch system transfers the load to the secondary (generator) source.
Once utility power is restored to the home or building, the transfer switch transfers the load back to the normal source, and initiates
generator engine shutdown.
The following features are incorporated into each OVATION™ Series Automatic Transfer Switch:
• Automatic Transfer Switch and Load-center combined in one enclosure – Eliminates the need for a separate sub
panel; significantly reduces installation time, expense and complexity. Load-center accepts interchangeable type circuit breakers
from Siemens®, Square D®, Cutler-Hammer®, and GE®. See Section 2.2.
• Service Entrance Rated – All models carry service entrance ratings, eliminating the need for separate service entrance
equipment.
• Automatic Switching between utility and generator – When the transfer switch senses partial or total loss of electricity
for 5 seconds, it automatically starts the generator (equipped with appropriate remote-starting capabilities), and transfers the
load to generator power with circuit breaker based switching.
• Programmable Generator Exerciser – Tests generator on a regular interval (programmable to 0, 7, 14 or 28 days) to help
maintain a reliable generator.
• User Interface Display – User display with LEDs that indicate system status and situations requiring attention.
In the generator mode, optional PowerPause™ Load Management modules can manage up to six (6) 240 VAC (or 12 x 120 VAC)
connected loads based on parameters set up at installation. As generator power capacity becomes available, the OVATION™
transfer switch will attempt to turn on each PowerPause™-controlled load until the generator reaches 85% utilization. This allows a
larger number of loads – some intermittent – to be supported without nuisance tripping of the generator or investing in a larger
generator. Installing an OVATION™ Automatic Transfer Switch system with PowerPause™ Load Management modules, most
applications can utilize a generator that has 25% less output than standard installations with a conventional automatic transfer
switch, reducing initial installation and generator operating costs and maintenance.
The startup and shutdown sequence limits the generator from rapid, intermittent start-up and shutdown, thus prolonging generator
life. Here’s how your OVATION™ Series ATS works:
1. Waits up to 5 seconds after sustained power loss to start up generator.
2. Waits up to 15 seconds to transfer load to generator. Delay looking for successful utility power grid re-strike.
3. Once utility power is restored, the system waits one minute to transfer the load back to utility.
4. Five minutes after re-transfer, the system completes the generator cool down and shuts down.