BRUEL & KJAER VIBROCONTROL 920 User manual

VIBROCONTROL 920
C102 833.002

All rights reserved
No part of this technical documentation may be reproduced
without prior written permission of Brüel & Kjær Vibro GmbH.
Subject to change without prior notice.
Copyright 2014 by Brüel & Kjær Vibro GmbH, D-64293 Darmstadt

VC920E / C102833.002 / V 13
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Contents
1General........................................................................................3
1.1 OK Monitoring.................................................................................................4
1.2 VIBROCONTROL 920 operation after switch-on or power return...................4
2Technical Data.............................................................................5
3Display and operating elements...................................................8
3.1 Button: MODE.................................................................................................8
3.2 Measured Value / Parameter..........................................................................8
3.3 Display period.................................................................................................8
3.4 Status signals .................................................................................................9
3.5 Reset ............................................................................................................10
3.6 Store.............................................................................................................10
4Internal Tests and Error Signals.................................................11
4.1 Test of the LED display and alarm LEDs......................................................11
4.2 Displaying the program version ....................................................................11
4.3 Displaying the calibration constants..............................................................11
4.4 Error messages ............................................................................................11

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5Setups........................................................................................13
5.1 Function: Displaying parameters ..................................................................13
5.2 Function: Changing parameter values..........................................................14
5.3 Parameter: Group 1......................................................................................15
5.4 Parameter: Group 2......................................................................................17
5.5 Parameter: Group 3 Service Parameter .......................................................20
6Mounting and Installation ...........................................................21
6.1 Mounting and Installation Instructions...........................................................21
6.2 Connecting Cable shields (*1).......................................................................22
6.3 Shield earth (*2).............................................................................................22
6.4 Mounting.......................................................................................................23
7Wiring diagrams.........................................................................25
8Service.......................................................................................29
8.1 Cleaning........................................................................................................29
9Instrument versions....................................................................30
10 Parameter list.............................................................................31

General VIBROCONTROL 920
VC920E / C102833.002 / V 13
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VIBROCONTROL 920
1 General
VIBROCONTROL 920 is an instrument for measurement, monitor-ing and
display of bearing resp. housing vibrations. The amplitude of the current
measurement is displayed as the effective (rms) value of vibration velocity
directly at the instrument on a three-digit, seven-segment LED display.
The standard sensor connected to the VIBROCONTROL 920 is normally a
vibration velocity sensor. When an acceleration sensor is used the signal is
integrated to the corresponding value of vibration velocity.
Two adjustable limit values, within the same full scale range, are available for
signalling alarms. To prevent the alarm relays being activated by short-term
high vibration levels which exceed the alarm values, a time delay can be
activated for each individual alarm relay. Limit value exceedances are
displayed on the VIBROCONTROL 920 by alarm LEDs while the excee-
dances can be signalled further using the respective potential-free alarm
relay contacts.
Setting up of the instrument for the measurement and monitoring task is
done by means of setup parameters.
A diagnosis output (terminals B / ↓) is available for checking purposes and
enables analysis of the input signal with correct phase.
All cable connections to the instrument are made by means of screw
terminals.

VIBROCONTROL 920 General
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1.1 OK Monitoring
Self-monitoring of the power supply, the internal microprocessor system as
well as the sensor status is done by the OK monitoring system.
An existing OK error is displayed by an LED and signalled by the change-
over of potential-free contacts of the OK relay. In the case of a fault the light-
emitting diode will go off and the contacts of the corresponding relay will
change over.
1.2 VIBROCONTROL 920 operation after switch-on or
power return
The instrument automatically executes a self-test lasting approximately 6
secs. each time it is switched on. Through this a calibration constant for the
measuring circuit is determined which is then calculated into the results of all
future measurements. During this self-test phase the status of the OK and
limit relays is retained as defined for an error-free condition.
After completion of the self-test the instrument switches to the monitoring
operation. After this time any exceedances of the pre-defined limit and
calibration values lead to corresponding event signals.
Attached safety instructions for installation,
commissioning and disposal must be
observed!

Display and operating elements VIBROCONTROL 920
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2 Technical Data
Power supply 115 / 230 V AC +/- 15 %;
50 / 60 Hz
24 V DC -25 % / +33 %
Load AC: Pmax: 12 VA
DC: Pmax: 7 W
Standard delivery 230 V AC
Fuses 24 V DC: fine-wire fuse 500 mA/tr
115 / 230 V AC: temperature fuse in the
transformer
The power supply must only be made via separator (switch or circuit breaker)! The switched
used as a separator must meet the requirements according to IEC 60947-1 und IEC 60947-3
and be suitable for application
Caution
Only one type of power may be connected at one time.
Measurement variable Effective (rms) value of vibration velocity
Frequency range 1 ... 1000 Hz1
10 ... 1000 Hz2
Accuracy ±5 %, in relation to displayed value
Internal resistance Ri AC = 35 kΩ
Ri DC = 39 kΩ
Sensor types
Vibration acceleration sensor
Sensitivity 10 mV/g x (0.1 ... 1.99)
100 mV/g x (0.1 ... 1.99)
Power requirement -24 V DC / 5 mA
Current requirement + 4 mA / Ri< 4 kΩ
Vibration velocity sensor
Sensitivity 70 mV/mm/s x (0.1 ... 1.99)
100 mV/mm/s x (0.1 ... 1.99)
Analog outputs
Short-circuit proof 0 ... 10 V RL> 10 kΩ
0 / 4 ... 20 mA RL< 500 Ω
1VIBROCONTROL 920-2k: 1 … 2000 Hz
2VIBROCONTROL 920-2k: 10 … 2000 Hz

VIBROCONTROL 920 Technical Data
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Diagnostic outputs (Buffer) frequency range
Input 1 Vpp; 10 Hz < fo< 1 kHz
Transmission factor 1 : 1 (see note)
Amplitude error 5mV + 0,5% of input signal amplitude (10Hz - 1kHz)
5mV + 10% of input signal amplitude (1Hz - 1kHz)
Load resistance > 3,3 kΩ
Note This indication applies to the connecting cable AC-185 not longer than 20 m.
Relay outputs
Potential-free contacts
Contact load: Ohmic load: 100 W / 600 VA
max. 30 V DC; 300 V AC, 3 A
Caution With an inductive load a suitable spark-suppression device must be
employed. The spark-suppression device must be installed as near as
possible to the source of the interference.
Temperature ranges 0 ... 50 °C working temperature range
-10 ... 70 °C storage temperature range
Note
1 x VIBROCONTROL 920 in an AC-2112 housing 0…40 °C ambient temperature range
2 x VIBROCONTROL 920 in an AC-2112 housing 0…40 °C ambient temperature range
Protection type IP 20
Fire protection class according to UL94: V - 0
according to VDE 0304: Class IIb
Cable connection Screw terminals
Connection cross-sectional area max. 2,5 mm2
Weight 920 g
Dimensions 150 mm x 78 mm x 115 mm (W x H x D)
The VIBROCONTROL 920 conforms to the following prescribed standards
and guidelines:
EN 61010-1
EN 61326-1
WEEE-Reg.-No. DE 69572330
product category / application area: 9

Display and operating elements VIBROCONTROL 920
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Safety and reliability related values according to DIN EN ISO
13849-1
Safety and reliability related values MTTF, PL and Category according to DIN EN ISO
13849-1 have been evaluated for VIBROCONTROL 920 with the following results:
Parameter
Value (50 °C)
MTTF
922.441 h
~ 105 years
PL
c
Category
1
Test conditions:
♦Operating temperatures: 50 °C.
♦Environmental conditions: Ground Benign, Controlled
Note: The results of this assessment are valid when the following procedures are
followed:
♦The Relays of the VIBROCONTROL 920 have to be operated in the
„normally energised” mode.
♦The analog 4-20 mA signal industry-standard current loops must be
used.
♦The OK Relay has to be used as system function.
♦The VIBROCONTROL 920 system must be protected against erroneous
change in configuration.
Abbreviations:
MTTF Mean Time To Failure
PL Performance Level From PL "a" (highest failure probability) to PL "e"
(lowest failure probability)
Category Category (CAT)
Classification of the safety related parts of a control system in
respect of their resistance to faults and their subsequent behaviour in
the fault condition, and which is achieved by the structural
arrangement of the parts, fault detection and/or by their reliability.
Ground Benign, Nearly zero environmental stress with optimum engineering operation
Controlled and maintenance.
Note:
More detailed information about safety and reliability regarding EN
13849-1 values can be obtained on request from Brüel & Kjær Vibro
([e-mail]).

VIBROCONTROL 920 Display and operating elements
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3 Display and operating elements
3.1 Button: MODE
The operating mode of the instrument is changed by pushing the MODE
button.
Normal operation
One push of the button; Preparation for parameter entry resp. check mode.
Parameter mode
Roll function; Each push of the button switches to the next operating mode
3.2 Measured Value / Parameter
Measurement value display
Three-digit, seven-segment LED display
The display resolution is automatically selected to correspond to the selected
measurement range.
Buttons: Corresponding to the direction of the arrows, the setup value of the
selected parameter will be increased or decreased by one step. If the button
is pushed and held the single-step function will change to a rolling function.
3.3 Display period
The period the seven-segment LED display stays on can be defined between
"Off after 3 minutes" or "Permanently on" and 3 levels of display brightness
for each parameter can be selected. The display switches on when any of
the function buttons is pushed.