The panel organizes a three position selector switch for "Auto", "Soft Load Transfer" and "Transfer Preset" operation and LED status indicators.

SOFT LOAD TRANSFER
manually selects the soft load mode of operation regardless of the settings in the soft load power transfer controller. The time in the parallel position is based on the generator load/unload ramp time setting.

TRANSFER PRESET
manually initiates a soft power transfer based on the soft load controller settings (base loading, soft load transferring or importing/exporting).

Additional controls enable users to set bypass time delays and reset alarms,

The Controller - the most advanced digital controller in the industry - automatically starts the engine and controls load transfer to an onsite power source in the event of a utility power outage. If the onsite power source fails, it automatically transfers the load to the utility power source in an open transition mode.

It includes all voltage, frequency control and timing functions required for emergency and standby power applications.

Touch pad programming establishes all operational settings and features, without the need for meters or variable power supplies. Onboard diagnostics provide control panel and automatic transfer switch status information to analyze system performance. Password protection prevents unauthorized use.

The microprocessor logic board is separated and isolated form the power board to improve electrical noise immunity performance and to help assure compliance with rigorous transient suppression standards. (See Ordering Information page for standards compliance chart.)

This screen shows that soft load transfer can be initiated automatically at a preset time or level of integrated kW demand. With a time-of-day setting, the operating mode would continue for a prescribed duration. With a kW demand setting, the operating mode would continue until the kW demand dropped below the preset kW level. Selecting both time-of-day and kW integrated settings enables either setting to initiate operation, but both settings must be satisfied before operation can be terminated automatically.

Included in this screen is a representation of a synchroscope showing the relative phase angle between the two sources of power.

This screen also displays:

• Phase-to-phase voltage, frequency, current, kW, kVA and kVAR for each power source.
• Percent of load being supplied from each source
• Load kW and system status
• Power transfer switch position
• Preset mode of operation
• Open or closed position of both power source breakers

A screen for each power source shows detailed displays of a variety of electrical parameters:

• Phase voltages and currents, line-neutral voltages, average phase voltage and current
• Voltage and current unbalances
• Phase voltage
• Frequency and power factor
• Utility source import and export kWh
• Power source kW, kVA and kVAR

A series of system configuration screens, such as this one enable users to set system parameters, Protective control functions and eight programmable user inputs for alarming or signaling conditions of external devices. Multiple levels of password protection controls access to the screens. Users can use this screen to set:

• System operation - soft load transferring, base loading or importing/exporting modes
• Soft load ramp time
• Utility power cutoff setpoint
• Base load kilowatt setpoint
• Import or export kilowatt setpoint

This screen displays any of the last 1000 events that are automatically time-and-date stamped and saved in a historical database. The event log saves all user acknowledgments, including the ID of the acknowledging user. Event categories cover:

• Transfer switch status, including transfers to the onsite power or utility sources
• Utility and onsite power source status, including tripping of protective functions, exceeding system setpoints, acceptance of permissive setpoints and status of user-defined discrete inputs and feeder circuit breaker status
• Engine generator status, including engine start/stop and user-defined engine alarms and shutdowns