Bently Nevada 3500/25 Data sheet

3500/25 Enhanced Keyphasor Module

Datasheet

BentlyNevadaMachineryCondition Monitoring

141532 Rev. T

Description

The3500/25Enhanced Keyphasor Moduleis a half-height, two-channelmoduleused to provideKeyphasor signals to themonitor modules in a 3500rack. Themodulereceives input signals from proximity probes or magnetic pickups and converts thesignals to digitalKeyphasor signals that indicate when theKeyphasor mark on theshaft coincides with the Keyphasor transducer. The3500Machinery Protection System can accept up to four Keyphasor signals for normal configuration and up to eight Keyphasor signals in a paired configuration.

Keyphasor signalis a once-per-turn or multiple- event-per-turn pulsefrom a rotating shaft or gear used to providea precisetiming measurement. This allows 3500monitor modules and externaldiagnostic equipment to measureshaft rotativespeed and vector parameters such as 1Xvibration amplitudeand phase.

TheEnhanced Keyphasor Moduleis an improved 3500 system module. It offers expanded Keyphasor signal processing capabilities over theprevious design while maintaining completedownward-compatibility in terms of form, fit and function with existing Keyphasor modules for use in legacy systems. TheKeyphasor module, PWA 125792-01, is completely replaced by theupdated 149369-01module.

When a system Keyphasor input is required for TripleModular Redundant (TMR) applications, the3500system should employ two Keyphasor modules. In this configuration, the modules work in parallelto provideboth a primary and secondary Keyphasor signalto theother modules in therack.

A system with morethan four Keyphasor inputs may usea paired configuration provided thereareno morethan four

3500/25EnhancedKeyphasorModule
Datasheet	141532 Rev. T

primary Keyphasor input signals. A paired configuration requires two consecutive monitoring positions in either theupper/lower or both half-slot positions. Four Keyphasor modules willaccept four primary and four backup input channels and providefour output channels (oneper module). A configuration of two paired and onenon-paired (three Keyphasor modules total) is also possible. In such a configuration, theuser may configure theonenon-paired Keyphasor (order either two 2-channelor one1-channeland one2channeloption)

TheIsolated Keyphasor I/Omoduleis designed for applications wheretheKeyphasor signals aretied in parallelto multipledevices and requireisolation from other systems, such as a controlsystem. TheIsolated I/Omodulewas created specifically for Magnetic Pickup applications but is compatiblewith and will provideisolation for Proximitor*applications as long as an externalpower supply is provided.

Theintent ofthis I/Omodulewas primarily to measureshaft speed and not phase. The modulecan providephasemeasurements, but this I/Ointroduces a slightly higher phaseshift than theNon-Isolated I/Oversion. Figure1 shows theamount ofphaseshift that the Isolated I/Omodules willadd at different machinespeeds.

Enhanced product features includegeneration ofonce-per-turn event signals from multi- event-per-turn inputs, field-upgradeable firmware, and asset management data reporting.

2/10

3500/25EnhancedKeyphasorModule
Datasheet	141532 Rev. T

Specifications

Inputs

Power	3.2 Watts typical
Consumption
	Each KeyphasorModuleaccepts up
	to two transducersignals from
	proximity probetransducers or
	magnetic pickups. Theinput signal
	rangeis +0.8 V to -21.0 V
Signal	(NonIsolated I/Omodules)or+5V to
	-11V (Isolated I/Omodules). Signals
	exceeding this rangearelimited
	internally by themodule. Passive
	magnetic pickups requirea shaft
	rotativespeed greaterthan 200 rpm
	(3.3 Hz).
Input	21.8 k Ωminimum
Impedance

Signal Conditioning

		Input rangeof 1 to 1,200,000 cpm
	Speed/	(0.017 to 20 kHz). Supports multiple
		events perrevolution to a maximum
	Frequency
		of 20 kHz.
	Signal
		Output rangeof 1 to 99,999 cpm
	Ranges
		(0.017 to 1667 Hz)
	Speed/
	Frequency	Specified at +25°C (+77°F).
	Signal
	Accuracy
	Non-	0.017 to 100 Hz… ±1 cpm
		101 to 500 Hz… ±8 cpm
	processed
	Signals	501 to 20 kHz… ±1% of cpm
	Processed	0.017 to 60 Hz… ±1 cpm
		61 to 150 Hz… ±8 cpm
	Signals
		151 to 20 kHz… ±1% of cpm

Transducer Conditioning

	Auto	Minimum signal amplitudefor
		triggering is 2 volts peak to peak and
	Threshold	minimum frequency is 120 rpm (2
		Hz).
		Useforany input above0.017 Hz(1
	Manual	rpm for1 event perrevolution). User-
		selectablefrom 0 to -20 volts dc.
	Threshold	Minimum signal amplitudefor
		triggering is 500 millivolts peak to
		peak.
	Hysteresis	User-selectablefrom 0.2 to 2.5 Volts.
	Outputs
		Two buffered Keyphasoroutputs are
	Buffered	availableat thefront of therack via
		coaxial connectors. Two buffered
	Keyphasor
		Keyphasoroutputs arealso available
	Signals
		at theback of therack via Euro Style
		connectors.
	Output	504 Ωmaximum buffered output
	Impedance	impedance.
	Keyphasor	-24 Vdc, 40 mA maximum per
	Transducer
		channel.
	PowerSupply
	Front Panel LEDs
	OK LED	Indicates when a fault has been
		detected in theKeyphasorModule.
	TX/RXLED	Indicates when theKeyphasor
		Moduleis communicating with the
		Rack InterfaceModule(RIM).
	Environmental Limits
		-30°C to +65°C (-22°F to +150°F)
		when used with KeyphasorI/O
	Operating	Moduleotherthan theInternal Barrier
		version.
	Temperature	0°C to +65°C (32°F to +150°F)when
		used with KeyphasorInternal Barrier
		I/OModule(Internal Termination).
	Storage	-40°C to +85°C (-40°F to +185°F)
	Temperature
	Humidity	95%, non-condensing

3/10