FW Murphy has introduced the AS731 generator controller; which is an upgrade to Murphy's widely used AS730 series. The company said the AS731 controller is especially suited for use in unmanned, standby diesel generator applications and that its comprehensive control, measurement and display features allow it to be used in place of multiple control units, trip units and indicating gauges at a fraction of their cost. New features include a redesigned front faceplate, a new microprocessor, built-in true RS232 communication port, free downloadable Windows-based PC communications software and a reduced price.
The company said it designed the unit to be powerful yet especially easy to use. For example, setup can be carried out using the communication software or front faceplate buttons. The familiar Off, Auto and Manual Start/Stop buttons offer the choice of manual or automatic operation. A 32-character, backlit LCD is used to display operating mode, system status, engine/generator parameters and fault conditions. The AS731 is designed to meet the intent of SAE's load dump recommendations for withstanding harsh electrical environments.
The controller provides five programmable inputs and four programmable outputs for more than 40 programmable functions. Any AS731 can be programmed for a wide range of applications without the need to change EPROMs. Whether 12 Vd.c., or 24 Vd.c., single-phase or three-phase (from 85 to 300V a.c. L-N), preheat/warmup/cooldown -- the company said the AS731 controller will fit practically any standard application right from the box. It comes standard with a.c. parameter monitoring that includes over- and under-voltage detection, over- and under-frequency, over-current (both instantaneous and IDMT), d.c. parameter monitoring (high/low battery monitoring and battery alternator charge monitoring) as well as engine status monitoring.
The unit offers more than 50 programmable functions for maximum flexibility. Available timers include start delay, preheat, crank, crank rest, number of start attempts, alarm override, engine warmup, speed signal, (mains a.c.) restoration, cooldown and (fuel) energized to stop.
Inputs with the AS731 controller include oil pressure and coolant temperature configurable for fault switch (open or closed on fault) or resistive senders. Inputs 3 to 5 may be set for a range of fault contacts or control options, such as warning fault, shutdown fault, load release, manual restore, lamp test, alarm mute or test. Remote start input configuration can bc either open from positive or closed to positive. The four outputs can be set to one of 50 signaling and control options.
Generator program options include trip levels/response for crank release, underspeed, overspeed, three-phase a.c. under- and over-voltage warning, charge fail settings and WL crank release.
The RS232 communication port and PC software allow remote monitoring, control and automatic fault notification regardless of gen-set location. Access to programming function is restricted by a four character password.
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