Features Plug-n-play units with factory programmed parameters 4-20 ma feedback signal Isolated relay alarm outputs Frequency input Diagnostic indicators NEMA 4 Enclosure Model PE3, Tachometer Panel Benefits Prevents equipment damage and material spoilage Prompt alert for stalled, over speed or zero speed conditions Easy interface to existing systems. Use with a variety of sensors Moisture Resistant - Built for Wash Down Areas Overview The PE3 Tachometer is a microprocessor based, field mount device which detects pulses (12 VDC sinking), performs calculations based on the pulses and provides an LED readout in Revolutions Per Minute (RPM), Feet Per Hour (FPH), etc. The alarm relay setpoint and 4-20mA scaled output are factory programmed to customer specifications. Normal configuration is a complete unit mounted in a NEMA 4 enclosure, with a viewing window to monitor the display. The enclosure includes: the tachometer circuit board, a relay, a step-down transformer, a 1A circuit breaker and a terminal strip for wiring input power, the sensor, 4-20mA signal, and the relay output. Pulses can be provided by any sensor or encoder which meets the input specifications. PharesElectronics.com 1
Details Circuit Board The circuit board is the heart of the tachometer. It contains the voltage regulators, signal filtering, microprocessor, digital to analog converter, seven-segment LED displays and their drivers. LED indicators are included to assist in troubleshooting. The microprocessor senses the incoming pulses, converts the period of the pulses to a rotational speed, and sets the drivers to the seven-segment LED display. Each microprocessor is programmed based on the speed range and pulse configuration of the application. The digital to analog converter drives the 4-20mA scaled output proportional to speed. The sensor wiring is protected internally to prevent the effects of short-circuiting of the sensor leads. The input voltage is clamped to prevent spikes from damaging the unit. Relay The relay indicates the speed condition. When speed is greater than the programmed minimum setpoint, the relay energizes and remains energized as long as the speed is greater than the minimum speed. The relay contacts are of the Form C type, providing either normally open or normally closed contacts. There are three sets of contacts available on the relay. Transformer The transformer converts the line voltage to a lower AC voltage. The circuit board and sensor operate on 12 Volts DC. The transformer steps the voltage down to levels suitable for rectification to DC. The transformer input can be either 120VAC or 240VAC, and is assembled at the factory for whichever voltage input is specified. Enclosure and Wiring The above components are assembled into a NEMA 4 rated enclosure. A window in the enclosure allows the tachometer speed to be read while operating. All wiring is complete. A terminal strip is provided for connecting field wiring. See the Enclosure specifications for sizes and mounting dimensions. PharesElectronics.com 2
Specifications Figure 1. PE3 Tachometer back panel and terminal strip. Display Seven Segment LED, 4 Digit, with decimal point. LED Height: 0.75 (19mm) Color: Red Analog Output 4-20mA, proportional to speed Relay Output Coil Voltage: 12 VDC Coil Current: 100 ma Contacts Quantity of 3 - NO, NC (Form C) Available Contact Rating: 10A @125 VAC PharesElectronics.com 3
Power Requirements With Enclosure/Transformer: Input Power: 120 or 240 VAC, 60 Hz Current: <1.0 A Circuit Board Only: Input Power: 12 VAC, 50-60 Hz Current: <3.0 ma Enclosure Size: 10in. x 8in. x 6in. Rating: NEMA 4 Weight: 15 lb. Figure 2. Enclosure Dimensions PharesElectronics.com 4
Part Numbers Part Number Input Voltage Display Signal Input Relay Output Analog Output PE3-120 120 VAC 4 Digit LED Frequency, Quantity of 3, 4-20 ma 12 VDC Sinking (NPN), 3 Wire N.O./N.C, N.O., N.C. PE3-240 240 VAC Accessories The PE3 Tachometer System + + + PE3 Tachometer Sensor (sold separately) Sensor Target (sold separately) TSA Box (optional, sold separately) Sensor Targets The PE3 Tachometer System requires a target for sensing and measuring speed. Sensor targets are sold separately. Suitable targets are: Magnetic Disk Split Coupling Geartooth wheel, bolt head or key stock with high ferrous (iron) content PharesElectronics.com 5
Sensors Phares Electronics Digital Output Hall Effect Sensors and Geartooth Sensors are simple on/off non-contact switching devices. Digital output signal is clean, fast and switched without bounce an inherent problem with mechanical contact switches. They are magnetically activated switches which detect the motion of an electromagnet, permanent magnet, or ferromagnetic material with an applied magnetic bias. Phares Electronics Hall Effect Sensors and Geartooth Sensors are produced in a variety of sizes. Please refer to our website www.phareselectronics.com for part numbers, or contact us for assistance with choosing a sensor for your application. Phares Electronics Sensor Features Hall Effect Sensor Non-contact switching Digital output signal Large operating temperature range from -40 F to 300 F Wide operating voltage range from 3.6 to 24 VDC Omnipolar sensing Use outdoors or in wash down areas Vibration tolerant Not rotation direction sensitive RoHS compliant Geartooth Sensor Non-contact switching Digital output signal Large operating temperature range from -40 F to 300 F Wide operating voltage range from 4.5 to 24 VDC Ferromagnetic target sensing Omnipolar magnetic target sensing Use outdoors or in wash down areas Vibration tolerant First-tooth detection Not rotation direction sensitive RoHS compliant PharesElectronics.com 6
Terminal Strip Assembly Box Figure 3. Sensor mounted with Terminal Strip Assembly (TSA) Box. The TSA Box is used to terminate sensor wiring for applications which require long cable runs. It can provide quick and convenient mounting for Phares Electronics sensors. Phares Electronics, LLC PharesElectronics.com 7