3500/25 Enhanced Keyphasor Module
Datasheet
Bently Nevada Machinery Condition Monitoring
Description
The 3500/25 Enhanced Keyphasor Module is a half-height,
two-channel module used to provide Keyphasor signals to
the monitor modules in a 3500 rack. The module receives
input signals from proximity probes or magnetic pickups and
converts the signals to digital Keyphasor signals that indicate
when the Keyphasor mark on the shaft coincides with the
Keyphasor transducer. The 3500 Machinery Protection
System can accept up to four Keyphasor signals for normal
configuration and up to eight Keyphasor signals in a paired
configuration.
Keyphasor signal is a once-per-turn or multipleevent-per-turn pulse from a rotating shaft or gear
used to provide a precise timing measurement. This
allows 3500 monitor modules and external diagnostic
equipment to measure shaft rotative speed and
vector parameters such as 1X vibration amplitude and
phase.
141532 Rev. T
The Enhanced Keyphasor Module is an improved 3500
system module. It offers expanded Keyphasor signal
processing capabilities over the previous design while
maintaining complete downward-compatibility in terms of
form, fit and function with existing Keyphasor modules for use
in legacy systems. The Keyphasor module, PWA 125792-01, is
completely replaced by the updated 149369-01 module.
When a system Keyphasor input is required for Triple Modular
Redundant (TMR) applications, the 3500 system should
employ two Keyphasor modules. In this configuration, the
modules work in parallel to provide both a primary and
secondary Keyphasor signal to the other modules in the rack.
A system with more than four Keyphasor inputs may use a
paired configuration provided there are no more than four
3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
primary Keyphasor input signals. A paired
configuration requires two consecutive
monitoring positions in either the upper/lower
or both half-slot positions. Four Keyphasor
modules will accept four primary and four
backup input channels and provide four output
channels (one per module). A configuration of
two paired and one non-paired (three
Keyphasor modules total) is also possible. In
such a configuration, the user may configure
the one non-paired Keyphasor (order either
two 2-channel or one 1-channel and one 2channel option)
The Isolated Keyphasor I/O module is designed
for applications where the Keyphasor signals
are tied in parallel to multiple devices and
require isolation from other systems, such as a
control system. The Isolated I/O module was
created specifically for Magnetic Pickup
applications but is compatible with and will
provide isolation for Proximitor* applications as
long as an external power supply is provided.
The intent of this I/O module was primarily to
measure shaft speed and not phase. The
module can provide phase measurements, but
this I/O introduces a slightly higher phase shift
than the Non-Isolated I/O version. Figure 1
shows the amount of phase shift that the
Isolated I/O modules will add at different
machine speeds.
Enhanced product features include generation
of once-per-turn event signals from multievent-per-turn inputs, field-upgradeable
firmware, and asset management data
reporting.
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3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
Transducer Conditioning
Specifications
Minimum signal amplitude for
Inputs
Power
Consumption
Signal
Input
Impedance
Signal Conditioning
Speed/
Frequency
Signal
Ranges
Speed/
Frequency
Signal
Accuracy
Nonprocessed
Signals
Processed
Signals
3.2 Watts typical
Each Keyphasor Module accepts up
to two transducer signals from
proximity probe transducers or
magnetic pickups. The input signal
range is +0.8 V to -21.0 V
(NonIsolated I/O modules) or +5V to
-11V (Isolated I/O modules). Signals
exceeding this range are limited
internally by the module. Passive
magnetic pickups require a shaft
rotative speed greater than 200 rpm
(3.3 Hz).
21.8 k Ω minimum
Input range of 1 to 1,200,000 cpm
(0.017 to 20 kHz). Supports multiple
events per revolution to a maximum
of 20 kHz.
Output range of 1 to 99,999 cpm
(0.017 to 1667 Hz)
Specified at +25°C (+77°F).
0.017 to 100 Hz … ±1 cpm
101 to 500 Hz … ±8 cpm
501 to 20 kHz … ±1% of cpm
0.017 to 60 Hz … ±1 cpm
61 to 150 Hz … ±8 cpm
151 to 20 kHz … ±1% of cpm
Auto
Threshold
Manual
Threshold
Hysteresis User-selectable from 0.2 to 2.5 Volts.
Outputs
Buffered
Keyphasor
Signals
Output
Impedance
Keyphasor
Transducer
Power Supply
Front Panel LEDs
OK LED
TX/RX LED
Environmental Limits
Operating
Temperature
Storage
Temperature
Humidity 95%, non-condensing
triggering is 2 volts peak to peak and
minimum frequency is 120 rpm (2
Hz).
Use for any input above 0.017 Hz (1
rpm for 1 event per revolution). Userselectable from 0 to -20 volts dc.
Minimum signal amplitude for
triggering is 500 millivolts peak to
peak.
Two buffered Keyphasor outputs are
available at the front of the rack via
coaxial connectors. Two buffered
Keyphasor outputs are also available
at the back of the rack via Euro Style
connectors.
504 Ω maximum buffered output
impedance.
-24 Vdc, 40 mA maximum per
channel.
Indicates when a fault has been
detected in the Keyphasor Module.
Indicates when the Keyphasor
Module is communicating with the
Rack Interface Module (RIM).
-30°C to +65°C (-22°F to +150°F)
when used with Keyphasor I/O
Module other than the Internal Barrier
version.
0°C to +65°C (32°F to +150°F) when
used with Keyphasor Internal Barrier
I/O Module (Internal Termination).
-40°C to +85°C (-40°F to +185°F)
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3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
Physical
Main Module
Dimensions
Height x
Width x
Depth)
Weight 0.34 kg (0.76 lbs.)
I/O Module
Dimensions
(Height x
Width x
Depth)
Weight 0.46 kg (1.01 lbs.).
119.9 mm x 24.4 mm x 256.5 mm
(4.72 in x 0.96 in x 10.10 in).
241.3 mm x 24.4 mm x 103.1 mm
(9.50 in x 0.96 in x 4.06 in)
Rack Space Requirement
1 half-height front slot
The half-height main modules
require a special mounting adapter
for mounting in the full-height slots.
Main Module
I/O Modules 1 full-height rear slot
The user can place the main
modules in any one of the 14
available slots. Each rack may have
no more than two main modules,
one in a top half-slot and one in a
bottom half-slot.
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3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
Hazardous Area Approvals
Compliance and Certifications
FCC
This device complies with part 15 of the
FCC Rules. Operation is subject to the
following two conditions:
l This device may not cause harmful
interference.
l This device must accept any
interference received, including
interference that may cause
undesired operation.
EMC
European Community Directive:
EMC Directive 2014/30/EU
Standards:
EN 61000-6-2 Immunity for
Industrial Environments
EN 61000-6-4 Emissions for
Industrial Environments
Electrical Safety
European Community Directive:
LV Directive 2014/35/EU
Standards:
EN 61010-1
RoHS
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.
CSA/NRTL/C
Class I, Zone 2: AEx/Ex nA nC ic
IIC T4 Gc;
When used with
I/O module
ordering options
without internal
barriers
When used with
I/O module
ordering options
with internal
barriers
Class I, Zone 2: AEx/Ex ec nC ic
IIC T4 Gc;
Class I, Division 2, Groups A, B, C,
and D;
T4 @ Ta= -20˚C to +65˚C (-4˚F
to +149˚F)
When installed per drawing
149243 or 149244.
Class I, Zone 2: AEx/Ex nA nC ic
[ia Ga] IIC T4 Gc;
Class I, Zone 2: AEx/Ex ec nC ic
[ia Ga] IIC T4 Gc;
Class I, Division 2, Groups A, B, C,
and D (W/ IS Output for Division
1)
T4 @ Ta= -20˚C to +65˚C (-4˚F
to +149˚F)
When installed per drawing
138547.
ATEX/IECEx
II 3 G
When used with
I/O module
ordering options
without internal
barriers
Ex nA nC ic IIC T4 Gc;
Ex ec nC ic IIC T4 Gc;
T4 @ Ta= -20˚C to +65˚C (-4˚F
to +149˚F)
When installed per drawing
149243 or 149244.
European Community Directive:
RoHS Directive 2011/65/EU
Maritime
ABS - Marine and Offshore Applications
DNV GL Rules for Classification – Ships,
Offshore Units, and High Speed and Light
Craft
When used with
I/O module
ordering options
with internal
barriers
5/10
II 3(1) G
Ex nA nC ic [ia Ga] IIC T4 Gc;
Ex ec nC ic [ia Ga] IIC T4 Gc;
T4 @ Ta= -20˚C to +65˚C (-4˚F
to +149˚F)
When installed per drawing
138547.
3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
Ordering Considerations
General
l External Termination (ET) Blocks cannot
be used with Internal Termination I/O
modules.
l When ordering I/O Modules with External
Terminations, the External Termination
Blocks and Cables must be ordered
separately.
l There are many technical considerations
involved in using the expanded signal
processing functions of the Enhanced
Keyphasor Module. A qualified Bently
Nevada sales representative should be
consulted prior to specifying or ordering
modules for such applications.
Internal Barrier I/O Module
Consult the 3500 Internal Barrier
specification sheet document (141495) if
the Internal Barrier Option is selected.
Isolated I/O module with Internal
04
05
C: Agency Approval Option
00 Not required
01 CSA/NRTL/C (Class 1, Div 2)
02 ATEX/IECEx/CSA (Class 1 Zone 2)
Terminations (Designed for use with
Magnetic Pickups)
Isolated I/O module with External
Terminations (Designed for use with
Magnetic Pickups)
External Termination Blocks
128718-01
128726-01
Cables
3500 Keyphasor (KPH) Signal to External
Termination (ET) Block Cable
Keyphasor External Termination Block
(Euro Style Connectors)
Keyphasor External Termination Block
(Terminal Strip Connectors)
Ordering Information
For the detailed listing of country and product
specific approvals, refer to the Approvals Quick
Reference Guide (108M1756) available from
Bently.com.
Enhanced Keyphasor Module
3500/25-AA-BB-CC
A: Number of channels
01
02
B: Type of I/O Module
01 I/O module with Internal Terminations
02 I/O module with External Terminations
03
Single half-height 2-channel Keyphasor
card (order for 2-channels)
Two half-height 2-channel Keyphasor cards
(order for 4-Channels)
Internal Barrier I/O with Internal Terminations
129530-AAAA-BB
A:Cable Length
0005 5 feet (1.5 metres)
0007 7 feet (2.1 metres)
0010 10 feet (3 metres)
0025 25 feet (7.5 metres)
0050 50 feet (15 metres)
0100 100 feet (30.5 metres)
B: Assembly Instructions
01 Not assembled
02 Assembled
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3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
Spares
149369-01 Enhanced Keyphasor Module
This module may be ordered as a direct
plug-in replacement for Keyphasor Module
125792-01.
125800-01
126648-01
125800-02
126648-02
135473-01
04425545 Grounding Wrist Strap (single use)
00580438
00502133
129770 Keyphasor Module User Guide
Half-height Blank Monitor Cover Kit
131151-01
Keyphasor I/O Module (Internal
Terminations)
Keyphasor I/O Module (External
Terminations)
Isolated Keyphasor I/O Module
(Internal Terminations) (Designed for
use with Magnetic Pickups)
Isolated Keyphasor I/O Module
(External Terminations) (Designed for
use with Magnetic Pickups)
Keyphasor I/O Module (Internal
Barriers and Internal Terminations.
Connector Header, Internal
Termination, 4-Position, Green
Connector Header, Internal
Termination, 12-Position, Blu
Half-height Blank Front Panel Cover
(qty 1, includes screws)
Half-height Card Adapter
125388-01 Half-height Chassis
125565-01 Card Guide
04300111 Assembly Screws (Order Qty. 3)
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3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
Graphs and Figures
Figure 1: Phase Error vs. Machine Speed
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3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
1. Buffered Transducer Outputs
2. I/O Module, Isolated Internal Termination
3. I/O Module, Isolated External Termination
4. I/O Module, Non-Isolated Internal Termination
5. I/O Module, Non-Isolated External Termination
6. Barrier I/O Module, Internal Termination
Figure 2: Front and Rear View of 3500/25 Keyphasor module
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3500/25 Enhanced Keyphasor Module
Datasheet 141532 Rev. T
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notice or obligation. Contact your Baker Hughes representative for the most current information.
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1631 Bently Parkway South, Minden, Nevada USA 89423
Phone: 1.775.782.3611 or 1.800.227.5514 (US only)
Bently.com
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