GE 469 Instruction Manual

Also see for Masoneilan 469 Series: Instruction manual Instruction manual Communications guide Instruction manual Instruction manual

Contents

CHAPTER 5: SETTINGS469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–31These settings apply only if the INPUT 1(4) FUNCTION is “Tachometer”.Once the tachometer is chosen for a digital input, the settings shown here follow theassignment message. The period of time between each switch closure is measured andconverted to an RPM value based on one closure per revolution.A trip and alarm may be configured such that the motor or load must be at a certain speedwithin a set period of time from the motor starting. The tachometer trip and alarm featuresare configured such that the specified speed (TACHOMETER TRIP SPEED or TACHOMETERALARM SPEED) must be reached in the specified time (TACHOMETER TRIP DELAY orTACHOMETER ALARM DELAY), otherwise the element operates. Initially, the time delaybegins when the motor is started and resets when the desired speed is reached. Once themotor is running and the speed drops below the set threshold, the time delay restarts andthe designated output contact will operate if the motor fails to reach the set speed in theallotted time. This element is active when motor is running and ignored while the motor isstopped. The RPM value may be viewed with the A2 METERING ZV SPEED Z TACHOMETERactual value.For example, an inductive proximity probe or hall effect gear tooth sensor may be used tosense the key on the motor. The probe could be powered from the +24 V from the inputswitch power supply. The NPN transistor output could be taken to one of the assignableswitch inputs configured as a tachometer.MESSAGE TACHOMETERALARM: OffRange: Off, Latched, UnlatchedMESSAGE ASSIGN ALARMRELAYS:Range: Alarm, Alarm & Auxiliary2,Alarm & Aux2 & Aux3, Alarm &Auxiliary3, Auxiliary2, Aux2 &Aux3, Auxiliary3MESSAGE TACHOMETER ALARMSPEED: 10% RatedRange: 5 to 100% in steps of 1MESSAGE TACHOMETER ALARMDELAY: 1 sRange: 1 to 250 s in steps of 1MESSAGE TACHOMETER ALARMEVENTS: OffRange: On, OffMESSAGE TACHOMETERTRIP: OffRange: Off, Latched, UnlatchedMESSAGE ASSIGN TRIPRELAYS:Range: Trip, Trip & Auxiliary2, Trip &Aux2 & Aux3, Trip & Auxiliary3MESSAGE TACHOMETER TRIPSPEED: 10% RatedRange: 5 to 95% in steps of 1MESSAGE TACHOMETER TRIPDELAY: 1 sRange: 1 to 250 s in steps of 1