Frank W. Murphy Mfr. has introduced the Modex AS730S programmable generator controller for use on standby generator sets. The controller allows remote operators to monitor generator status on demand from their own personal computers through a direct hook-up or over standard phone lines. Control and instrumentation features on the new unit are similar to those on Murphy's Autostart 710, with the addition of three-phase generator voltage and current measurement, display and fault tripping.

Modex software on a personal computer and a small RS232 interface allow an operator to program, monitor and control the AS730S controller either directly or through a modem link. An operator can run a complete service test in about three minutes, the company said. During that time the operator can query the unit, review all operating parameters, download the relevant information, produce a printout, and start the generator. In addition, the controller can also automatically "call home" when a problem such as a shutdown or warning occurs at the generator site.

"In just three hours one operator can complete checks on 60 generator sets," said Nick Meloy, Murphy's general sales manager. "Then in another three hours he can again contact those sets to find out if they have carried out their tests and if there were any problems."

The new unit features both automatic and program modes, which can be selected from push button keys located on the controller's face, a 32-character, back-lit liquid crystal display (LCD) and two front panel LEDs that indicate the selected operating mode (automatic or manual). It also offers fully programmable generator control options, timers, inputs, outputs and fault protections.

Dedicated relay outputs are used to control both engine fuel and starter motor. The controller features six programmable outputs, each of which may be set up for use as one of over 40 function types. For example, a controller could monitor preheat (four types), indicate that the engine is running, or display specific faults such as overspeed, overcurrent, start fail or low oil pressure.

The unit's fault detection, warning and automatic response system covers a range of possible scenarios. It features dedicated inputs for low oil pressure and high engine temperature detection, which can originate from either switch or analog sensors. Using analog sensors allows for pre-warning as well as shutdown engine alarms, and real-time display of oil pressure and engine temperature.

Also included with the controller's fault protection and alarm system are three programmable inputs, which may be set up for use with remote fault switches enabled for warning only or shutdown. In addition, the unit features user set trip levels and response for generator speed and frequency, three-phase voltage and three-phase current.