Digital Tach/Hourmeter w/Adjustable Overspeed Trip Point SHD30 and SHD30-45 Models The SHD30 and SHD30-45 are microprocessor-based tachometers with hourmeter and an overspeed trip point. The trip point can be connected as either a form C relay output or as a normally open SCR output for alarm or shutdown on overspeed. The SHD30 features a panel-mounting design, plastic enclosure that is 5-1/16 (129 mm) long and 4-1/4 in. (108 mm) high. The SHD30-45 has the same enclosure, but it also has a backplate with studs to mount like an OPLFC. The SHD30 models power and RPM data are supplied by either a magnetic pickup or a capacitor discharge (CD) ignition. The hourmeter is adjustable to a preset time and resettable to zero. Should power be lost, onboard batteries maintain the run hours display and allow for resetting the overspeed relay output. When a tach signal is present the SHD30 models display RPM. When a tach signal is not present, the display is blank unless the Read Hours membrane key on the faceplate is pressed and held. The five-digit, liquid crystal display is updated every second. The run hours, overspeed set point and current pulses per engine revolution can be displayed by manipulating the membrane switches. Run hours can be displayed even after power is lost. The run hours display can be configured to alternate with the RPM display. Gas Compressors Oil Field Equipment * When installed per FW Murphy drawing 20-08-0258 All trademarks and service marks used in this document are the property of their respective owners. This Enovation Controls product is exclusively distributed by FW Murphy in the Natural Gas Compression Market. Ease of Calibration The SHD30 models calibration is accomplished by entering the number of pulses per engine revolution using the Pulses per Revolution and Overspeed Set point membrane keys on the faceplate. The number of pulses is determined by the number of cylinders, cycles and ignition features. It is also determined by the number of ring gear teeth of the engine’s flywheel on a magnetic pickup system. Presetting and resetting running hours is done from the back and front of the SHD30 models. Specifications Power input: CD ignition: 90 to 350 VDC 150 µA typical @ 90 VDC 300 µA @ 350 VDC Magnetic Pickup: 5 to 120 Vrms 325 µA typical @ 5 Vrms, 100 Hz 450 µA typical @ 5 Vrms, 1 kHz 1 mA typical @ 5 Vrms, 5 kHz Case Material: Plastic Ignition Frequency Range: 3 to 666 Hz Magnetic Pickup Frequency Range: 1 to 10 kHz Overspeed Output: Connected to S.C.R. (Silicon Controlled Rectifier) terminals: 0.5 A, 350 VDC continuous Connected to Form C Relay terminals: Relay Contact, 0.5 A, 30 VDC, 125 VAC resistive Tachometer Accuracy: ±0.5% of the display reading or ±1 RPM whichever is greater 2 mA typical @ 5 Vrms, 10 kHz 15 mW max. @ 5 Vrms, 10 kHz 2.8 W max. @ 120 Vrms, 10 kHz Backup Batteries: 2 replaceable, long-life Lithium batteries, Panasonic CR2032 or equivalent, 3 V, 220 mAh power. Shelf life expectancy 10 yr. Operating Temperature: -4° to 158° F (-20° to 70° C) Storage Temperature: -40° to 300° F (-40° to 150° C) Hourmeter Range: 0 to 65535 hrs Hourmeter Accuracy: ±15 minutes per year Laboratory Approvals: CSA (Canadian Standards Association) approved for Class I, Division 2, Groups C & D hazardous areas In order to consistently bring you the highest quality, full-featured products, we reserve the right to change our specifications and designs at any time. FW MURPHY product names and the FW MURPHY logo are proprietary trademarks. This document, including textual matter and illustrations, is copyright protected with all rights reserved. (c) 2019 FW MURPHY. A copy of our typical warranty may be viewed or printed by going to www.fwmu

SHD30 Typical Wiring Diagram TB2 Magnetic Pickup Reset Houirmeter WARNING: In hazardous areas the overspeed relay contact is certified for use ONLY with FW Murphy non-incendive or intrinsically safe products. In non-hazardous areas overspeed relay contact may be used to switch electromechanical Tattletale® or Magnetic Switches that do not exceed the relay contact rating: 1 A, 30 VDC; 0.3 A, 110 VDC; 0.5 A, 125 VAC. However, the preferred output to switch electromechanical Tattletale® or Magnetic Switches is the N.O. SCR.