GE Bently Nevada 1900/27 User manual

Part Number 190127-01
Rev. F (09/07)
Bently Nevada™ Asset ondition Monitoring
Operation and Maintenance Manual
1900/27 Vibration Monitor

1900/27 Vibration Monitor Operation and Maintenance Manual
ii
Copyright 1994. Bently Nevada LLC.
All rights reserved.
The information contained in this document is subject to change without notice.
The following are trademarks of the legal entities cited:
Sealtite® is a registered trademark of Anamet Inc.
Teflon® is a registered trademark of DuPont.

iii
Contact Information
The following ways of contacting Bently Nevada are provided for those times when you
cannot contact your local representative:
Mailing Address 1631 Bently Parkway South
Minden, Nevada USA 89423
USA
Telephone [phone]
1.800.227.5514
Fax [phone]
Internet www.ge-energy.com/bently

1900/27 Vibration Monitor Operation and Maintenance Manual
iv
Additional Information
Notice:
This man al does not contain all the information req ired to operate and maintain
the prod ct. Refer to the following man als for other req ired information.
200150, 200155, and 200157 Accelerometers Information and Installation
G ide (Part N mber 164985-01)
89129 and 190520 Accelerometer User G ide (Part N mber 89134-01)
Prod ct Disposal Statement
ustomers and third parties, who are not member states of the European Union, who are
in control of the product at the end of its life or at the end of its use, are solely
responsible for the proper disposal of the product. No person, firm, corporation,
association or agency that is in control of product shall dispose of it in a manner that is
in violation of any applicable federal, state, local or international law. Bently Nevada LL
is not responsible for the disposal of the product at the end of its life or at the end of its
use.

v
Contents
1. 1900/27 Vibration Monitor Description ..................................................... 1
1.1 Features................................................................................................................................................. 1
1.2 Monitor onnections, Indicators, & ontrols.......................................................................... 4
2. Installation...................................................................................................... 6
2.1 Receiving Inspection........................................................................................................................ 6
2.2 Jumper Settings................................................................................................................................. 6
2.2.1 Setting Relays for Latching or Non-Latching Behavior............................................... 7
2.2.2 Setting Relays for Normally Energized or Normally De-energized Behavior .... 7
2.2.3 Setting 4 to 20 mA Interface Behavior During 1900/27 Monitor Bypass............ 8
2.2.4 Internal Jumper Location ......................................................................................................... 9
2.3 Monitor Enclosure.............................................................................................................................. 9
2.4 onfiguration Switch Settings...................................................................................................10
2.4.1 Relay Time Delay ........................................................................................................................10
2.4.2 Alert Relay Alarm onditions.................................................................................................10
2.4.3 onfiguring the Display for English or Metric Units ....................................................11
2.4.4 Initiating Self Test.......................................................................................................................11
2.5 onnecting Remote Reset............................................................................................................12
2.6 4 to 20 mA Interface onnections...........................................................................................12
2.6.1 onnecting able to the 1900/27 Monitor 4 to 20 mA Interface .........................12
2.7 Relay onnections ..........................................................................................................................15
2.7.1 Alert Relay onfiguration........................................................................................................16
2.7.2 Relay Internal Jumper Settings.............................................................................................17
2.7.3 Relay Electrical onnections..................................................................................................17
2.8 Power onnections ........................................................................................................................19
2.8.1 Types of Power onnections.................................................................................................19
2.8.2 Power Electrical onnections ...............................................................................................19
2.9 Field Wiring Diagram.....................................................................................................................21
3. Monitor Operation....................................................................................... 22
3.1 Monitor Display ................................................................................................................................22
3.1.1 English or Metric Display Units.............................................................................................22
3.1.2 The Display Mode Switch........................................................................................................23
3.1.3 Display Error odes ...................................................................................................................24
3.2 LED Indicators...................................................................................................................................25
3.3 Relay Mode Switch ..........................................................................................................................26

1900/27 Vibration Monitor Operation and Maintenance Manual
vi
3.4 Setpoint Adjustment ......................................................................................................................26
3.5 Resetting the Monitor.....................................................................................................................28
3.6 Buffered Transducer Output.......................................................................................................28
3.7 Initiating a Monitor Self Test........................................................................................................28
4. Maintenance & Tro bleshooting ...............................................................29
4.1 General Maintenance....................................................................................................................29
4.2 Monitor Adjustments .....................................................................................................................30
4.2.1 L D Zero Adjustment................................................................................................................30
4.2.2 Adjustment of the Monitor's 4 to 20 mA urrent Loop Interface..........................32
4.3 Troubleshooting...............................................................................................................................35
5. Appendix A - Performance Specifications................................................38
5.1 1900/27 Monitor Specification..................................................................................................38
5.1.1 Mechanical Specifications......................................................................................................38
5.1.2 Environmental Specifications...............................................................................................38
5.1.3 Monitor Power Specifications...............................................................................................40
5.1.4 Relay Specifications ..................................................................................................................40
5.1.5 Signal onditioning....................................................................................................................40
5.1.6 Accuracy.........................................................................................................................................41
5.1.7 LED Indicators..............................................................................................................................41
5.1.8 Monitor ontrols .........................................................................................................................42
5.1.9 4 to 20 mA Interface Specifications...................................................................................42
6. Appendix B - Peak Detection Methods .....................................................43
6.1 Peak Detector Theory.....................................................................................................................43
7. Appendix C - 1900/27 Monitor Config ration Form ...............................44
8. Appendix D - Accessories and Spare Parts..............................................46
8.1 Installation Hardware....................................................................................................................46
8.2 Spare Parts.........................................................................................................................................48
9. Appendix E - Hazardo s Area Approvals .................................................49

Section 1 - 1900/27 Vibration Monitor Description
1
1. 1900/27 Vibration Monitor Description
The 1900/27 Vibration Monitor provides continuous vibration monitoring for
machinery where most of the shaft vibration is transmitted through the bearing to
the case. Vibration amplitude is a primary indicator of the overall mechanical
condition of rotating machinery. Many machine malfunctions, including rotor
imbalance, misalignment, and bearing wear can be detected with vibration
measurements. Typical applications include general purpose and essential
machines with roller element bearings like pumps, fans, and compressors.
This section helps familiarize you with the monitor by listing the features that
make the monitor flexible and describing the monitor controls that make the
monitor easy to use.
1.1 Feat res
The features of the 1900/27 Vibration Monitor make the monitor more reliable
and easier to use. Many of these features have been used on previous Bently
Nevada monitors and have proven to be useful for protecting machinery. You can
program some of the features of the monitor by using jumpers or the 6-position
onfiguration switch.
Some of the non-programmable features are described below.
Transducer separate from monitor - Mounting only the transducer on the
machine requires less space and makes the transducer easier to install on
small machinery. Mounting the monitor away from the machine protects the
monitor from the harsh machine enviroment that is less suitable for
electronic instrumentation. This location makes it easier and safer for plant
personnel to access the monitor.
Digital LCD display - A digital liquid crystal display on the front of the
monitor indicates overall vibration or the Alert or Danger setpoints.
Because the monitor is designed to be mounted close to the machine rather
than on the machine, the monitor can be located where service personel
can read it easily.
Status LED indicators - Four LEDs on the front of the monitor indicate the
status of the monitor. These LEDs show whether the monitor is OK, in alarm,
or bypassed.
Remote Reset - A front panel reset button and remote reset terminals let
you reset latched relays or flashing LEDs without turning the monitor off.
The remote reset terminals allows the monitor to be reset from a remote
location without having to open the weatherproof enclosure.

1900/27 Vibration Monitor Operation and Maintenance Manual
2
Relay YPASS - A relay BYPASS switch lets you disable both relays while you
adjust the relay setpoints or maintain the machinery. This feature prevents
false alarms or undesired machinery shutdowns. When the monitor is
bypassed, the red BYPASS LED is on.
Coaxial connector - A coaxial connector on the front of the monitor
provides a buffered velocity signal (500 mV/in/s or 20 mV/mm/s) for locally
sampling dynamic data. The connector provides direct access to the
integrated transducer signal which can be used to diagnose and analyze
machinery.
Two alarm relays - The monitor has two single-pole, double-throw relays
(Type 2 FORM ). Use these relays as inputs to the machinery control
circuits, or to drive alarm annunciators such as a bell or light on an alarm
panel. You can also wire these relays together with other relays into an
AND or OR voting logic scheme. Although typically used as an Alert relays,
you can reconfigure the Alert relay to become a NOT OK relay, an Alert
logically OR'ed with NOT OK relay, or an auxiliary Danger relay. The relay
circuits include arc suppressors to increase relay contact life expectancy
and reduce arcs in hazardous locations.
4 to 20 mA Intereface - Systems set up to collect data usng a 4 to 20 mA
communications system can access the peak velocity data through this
interface.
True peak measurements - The 1900/27 Vibration Monitor uses an analog
peak-to-peak detector to determine the peak vibration amplitude. This
method is more accurate than methods which measure the RMS level and
attempt to convert it to peak value. The RMS method is poor because it
applies the conversion factor for pure sinusoidal signals even though
machinery vibration is rarely a pure sine wave (see Appendix B).
Timed OK/Monitor Defeat - This special proprietary circuit minimizes the
possibility of false alarms caused by a defective transducer, transducer
wiring, or transducer power supply.
Power-up Inhibit - This feature minimizes false alarms caused by a
transient power surge or interruption of power.
Monitor Self Test - The monitor conducts a self test which checks the
monitor's power supply voltages and verifies the signal path when you
power up the monitor or when you initiate a self test during operation of
the monitor.

Section 1 - 1900/27 Vibration Monitor Description
3
Programmable options provide flexibility and a wide range of standard features.
Internal J mper Options:
Normally Energized/De-energized Relays - The Alert and Danger relays can
be be either normally energized or normally de-energized. The normal
condition of a relay corresponds to its non-alarm condition. For example, a
normally energized relay would have power on the coil (ARM contacts NO)
when it is not in alarm and would remove power from the coil (ARM
contacts N ) when it goes into alarm. Both relays are independently set.
Latching/Nonlatching Relays - The Alert and Danger relays can be either
latching or nonlatching. Latching alarms must be cleared using the reset
button or by closing a switch between the reset terminals. Nonlatching
alarms automatically reset when the monitor no longer detects an alarm
condition. Both relays are independently set.
4 to 20 mA Interface ehavior during YPASS - When the monitor is
switched to BYPASS, the 4 to 20 mA output sends approximately 2 mA to
the host computer. Since some applications require dynamic data collection
during BYPASS, you can set the monitor so that it collects data even when
the alarms are bypassed.
Front Panel 6-position Config ration Switch Options:
Relay Time Delay - The Alert and Danger relay time delays can be set for 3,
5 , 10, or 15 seconds. Relay time delay is the amount of time that the
vibration level must be greater than the alarm setpoint level before an alarm
trips. The time delay minimizes false alarms from either "normal" transient
vibration or electrical noise sources. The relay time delay setting applies to
both relays as long as both are configured to activate under an alarm
condition.
Alert Relay Configuration - To help you use the monitor for different
applications, the Alert relay can be set to activate under any of the
following conditions:
Alert
Alert or NOT OK
NOT OK
Danger (as an auxiliary Danger relay)
Units - You can set the overall vibration level shown on the L D display to
display in either English (in/s) or metric (mm/s) units. Both units are true
zero to peak measurements, not RMS measurements converted to peak.
Monitor Self Test - A user-invoked self test switch is provided to aid in field
troubleshooting. When you invoke the self test, the signal path and alarm
threshold detection circuits are verified. All LEDs and L D numerical

1900/27 Vibration Monitor Operation and Maintenance Manual
4
segments turn on at the beginning of the self test to verify that they are
operating properly. The power supplies are checked continually.
1.2 Monitor Connections, Indicators, & Controls
The connections, LEDs and L D, and control switches are shown in the next
three figures.
Figure 1-1: Location of monitor connections