Complete automatic transfer switches with engine controller, exerciser and all necessary time delays


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Kevin L. Chisholm

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Automatic Transfer Switches
AST 3000 Series 

ATS3225 Series with Auto-Start Transfer System
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FEATURES
     The AST 3225 Auto-Start Transfer Switch System, CSA/UL Approved, provides an automatic transfer of an electrical load to a stand-by power supply in the event of a drop, or loss of voltage, on any or all phases of the normal power supply. Upon the restoration of normal power, the electrical load is automatically re-transferred to the normal power supply. The base unit comes complete with an ES-53 Controller, which starts the engine automatically and provides the necessary timing functions. All time delays are built into the ES-53, and are fixed to simplify installation, start-up, and field servicing. Included are the following timers:

  • TDES (Time Delay Engine Start): Adjustable from 0-32 seconds. This delay is necessary to prevent unnecessary engine starts. This delay also doubles as a preheat timer utilizing terminal 12 for diesel glow-plugs, if necessary.

  • TDNE (Time Delay Normal to Emergency): 4 seconds. This allows the engine to stabilize before load transfer.

  • TDEN (Time Delay Emergency to Normal): 3 minutes. This allows a delay after the utility returns, to ensure it has indeed returned and stabilized.

  • TDEC (Time Delay Engine Cool): 5 minutes. This allows the engine to continue running for a set time after transfer of the load back to the utility, to circulate coolant for a safe cool-down.

  • Engine Exerciser: Automatically starts the engine and runs it in the unloaded condition for the desired exercise time

Included also are "Safeties" which stop the engine when a condition of "Low Oil Pressure", "High Coolant Temperature", or "Overspeed" are sensed. The Engine Controller can read generator output frequency, so that it is not necessary to install a magnetic pick-up for a speed signal.

BENEFITS
    
With an AST3225 Auto-Start Transfer Switch System, and any generator having an electric starter, you can have a dependable stand-by power system, that will automatically supply you with back-up power when your primary power supply is lost. You can install an ES-53 Controller on your engine now, for remote start capability, and at a later date, purchase the remainder of the system, at no increase in total cost. Our removable connectors permit "PLUG AND RUN" operation. The molded case switches have zero stand-by power draw, unlike contactor based systems. The 225Amp rating enables handling of full load to most residential and small commercial electrical services; this enables stand-by power to be sent to any circuit in the facility. With a "PONY PANEL" installation, only the dedicated circuits can be powered when the utility is absent.  

An ideal power switching mechanism...
     The TM-225 transfer switch mechanism consists of a mechanical switching assembly which can be configured to satisfy various application requirements. It comes equipped with a transfer motor which utilizes the power from the source to which the electrical load is being transferred. The mechanism provides a positive mechanical interlock to prevent both switches from being closed at the same time. The TM-225 also incorporates motor control switches, terminal blocks, and voltage sensing connection points. Provision is also made for manual transfer of power source if necessary.
The TM225 mechanism is specifically designed to accommodate customer-installed control systems. If you require a simple and reliable switching mechanism, and you need the flexibility of in-house controls, the TM225 is your perfect solution.

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WattPower.com
Kevin L. Chisholm
2199 Grand Narrows Highway
Nova Scotia, Canada, B1Y-3P1

Phone: 902-871-2008
email:
kchisholm@wattpower.com

Page Created : 6 Nov 2003
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