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

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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
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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!

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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

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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.

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3.4 Status signals
OK error The occurrence of an OK-error is indicated by the extinction of the LED.
The OK relay is de-energized.
LIM 1, LIM 2 error signals
The behaviour of the limit relays is determined by the connection status of
the terminals 31/32 (Relay Reset).
Terminals 31/32 not connected resp. Contacts open
Limit value exceedances are stored - the limit relays remain energized - until
the Reset button is pushed. A reset of the limit relay is only possible if the
measurement value is lower than the corres-ponding limit value.
Terminals 31/32 connected by push-button
The energized limit relay contacts will be reset. A reset of the limit relay is
only possible if the measurement value is lower than the corresponding limit
value.
Terminals 31/32 permanently connected (Standard delivery)
The limit exceeedance is signalled only for as long as the limit value is
exceeded. If the measurement values fall lower than the limit values the LIM
LEDs and the limit relays will be reset.
Limit value LIM 1
Yellow LED / LIM 1 Relay
If the current measurement value is higher than the limit value and remains
at this level for longer than the set time delay, the LED will light up. The LIM 1
relay will react according to the defined setup. It will be energized when set
up as normally de-energized and will be de-energized when set up as a
normally energized relay.
If an OK error occurs during a LIM1 activation, the limit signal (LED and
relay) will be reset to the normal status for the duration of the OK error.

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Limit value LIM 2
Red LED / LIM 2 Relay
If the current measurement value is higher than the limit value and remains
at this level for longer than the set time delay, the LED will light up. The LIM 2
relay will react according to the defined setup. It will be energized when set
up as normally de-energized and will be de-energized when set up as a
normally energized relay.
If an OK error occurs during a LIM2 activation, the limit signal (LED and
relay) will be reset to the normal status for the duration of the OK error.
3.5 Reset
Normal operation
Reset the event signal as well as the associated relay.
The "REL.RESET" terminals have no function in connection with an OK
error.
Parameter mode
Leave the parameter setup mode. Changes to the parameter values are not
activated.
3.6 Store
Push Mode and Reset simultaneously:
Leave the parameter setup mode. Changes to the parameter values are
activated.

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4 Internal Tests and Error Signals
After switching the instrument on a number of tests are executed. If the result
of the test reveals an error in the operation of the instrument, this is displayed
on the measurement value field in the form of an error message.
4.1 Test of the LED display and alarm LEDs
The LED seven-segment displays are checked by displaying the figure 8, and
the associated decimal points are switched on. The alarm LEDs light up in
the sequence green - yellow - red. This test lasts for approx. 4 seconds.
4.2 Displaying the program version
In the mode display field a "v" is displayed and in the measurement value
display field the version number is displayed.
4.3 Displaying the calibration constants
In the mode display field a "c" is displayed and in the measurement value
display field the calibration constants are displayed.
4.4 Error messages
The error messages are displayed in the form of an " " followed by a
number. The display of the measurement value is overwritten for the duration
of the error message. In addition to the visual error signal, an error message
is always signalled by activation of the corresponding limit or OK relay.
If the input of the measured value is overmodulated, the dislay shows „ccc„.

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Error " 01"
The value of the calibration constants lies outside the permissible range. A
value between 0.5 and 2.0 is permitted. Occurrence of this error means an
error in the instrument’s internal acquisition electronics. The instrument
should be removed from the monitoring application and returned to the
nearest service station for repairs.
Error " 02"
The values of the internal voltages lie outside the permissible limits. For a
check see Group 3: Parameter 3 (+ 5 V) and Parameter 4 (+ 17 V).
Occurrence of this error means an error in the instrument’s power supply.
The instrument should be removed from the monitoring application and
returned to the nearest service station for repairs.
Error " 03"
The temperature inside the instrument housing has exceeded the 90 °C
(±10 %) limit. If this error message occurs the instrument should be
removed from the monitoring application and returned to the nearest service
station for repairs.
Error " 04"
OK-error identification
Always Power failure
Vibration acceleration sensor Cable break
Short-circuit between the conductors
Vibration velocity sensor Cable open circuit
In the event of this error the analog output will be switched to 0 volt resp. 0 /
4 mA. The OK LED will go off and the OK relay will de-energize and can only
be reset using the RESET button. Until the cause of this error is eliminated
the OK error signal will remain.
Error " 05"
Failure of the OK monitoring function. This error shows a failure of the OK
monitoring function. If this error message occurs the instrument should be
removed from the monitoring application and returned to the nearest service
station for repairs.
Error " ccc "
The measured value input is overmodulated. If the measured value is
situated again within the measuring range the error message disapears.

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5 Setups
General The parameters are divided into three Groups each with respectively seven
parameters. The parameters in Groups 1 and 2 are concerned with
configuration parameters while those in Group 3 are concerned with service
parameters.
Viewing or making changes to parameter values can only be done after first
entering a code number associated with the Group. Parameter entries only
take effect and are stored after leaving the entry mode, i.e. after
simultaneously pushing the MODE + RESET buttons. Changes to the
parameters are ignored when the entry mode is exited by pushing the
RESET button.
5.1 Function: Displaying parameters
MODE button
Push once. The number 1 is displayed in the mode display field.
resp. buttons
Push repeatedly until the desired code number is displayed in the
measurement value field.
MODE button
The mode selection is accepted. Now the parameter number 2 is displayed
and the associated parameter value is displayed in the measurement value
field.
MODE button
Pushing the MODE button switches to the next parameter.
RESET button
Pushing the RESET button exits the display mode. The corresponding value
of the input signal is displayed in the measu-rement value field.

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5.2 Function: Changing parameter values
MODE button
Push once. The number 1 is displayed in the mode display field.
resp buttons
Push repeatedly until the code number associated with the corresponding
parameter Group is displayed.
Parameter Group Code Number
1 11
2 22
3 3
MODE button
The mode selection is accepted. Now the parameter number 2 is displayed
and the associated parameter value is displayed in the measurement value
field.
resp buttons
Switching the parameter values to next higher resp. next lower value.
MODE button
By pushing the MODE button you can switch to the next parameter. If
changes are made to the parameter values, these are saved in an
intermediate memory until you exit the parameter mode.
MODE + RESET buttons
All parameter settings are accepted and take immediate effect. The
parameter mode is exited; the corresponding value of the input signal is
displayed in the measurement value field.
RESET button
Changes made to the parameter settings are ignored. The previous
parameter values are retained. The parameter mode is exited; the value
corresponding to the input signal is displayed in the measurement value field.

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5.3 Parameter: Group 1
Mode 1 Code number
Value: 11
Mode 2 Range allocation for analog output
Default value: 20 mm/s
Value Equals
10 0 ... 10 mm/s
20 0 ... 20 mm/s
50 0 ... 50 mm/s
100 0 ... 100 mm/s
Switching of measuring ranges
Switching from a smaller range to a larger range:
The defined limits values are retained.
Switching from a larger range to a smaller range:
As long as the defined limit values are larger than the new full scale they will
be converted to the new full scale. If the defined limit values are lower than
the new full scale they will be retained.
The automatic change in limit values will be signalled by flashing of the
respective alarm limit LEDs (LIM 1 and LIM 2). To reset this flashing the limit
value settings must first be changed, i.e. limit values lower than the full scale
must be set and the instrument switched off and then on again for the
change to take effect.
Mode 3 Limit value LIM 1
Default value: 4.5 mm/s
The adjustable range of the limit value is from 0 to the full scale value of the
selected range. The resolution of the steps in the adjustment is in every case
dependent on the selected range.
Range Resolution
0 ... 10 mm/s 0,1 mm/s
0 ... 20 mm/s 0,1 mm/s
0 ... 50 mm/s 0,2 mm/s (x,0 - x,2 - x,5 - x,7)
0 ... 100 mm/s 1 mm/s

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Mode 4 Limit value LIM 2
Default value: 7 mm/s
The adjustable range of the limit value is from 0 to the full scale value of the
selected range. The resolution of the steps in the adjustment is in every case
dependent on the selected range.
Range Resolution
0 ... 10 mm/s 0,1 mm/s
0 ... 20 mm/s 0,1 mm/s
0 ... 50 mm/s 0,2 mm/s (x,0 - x,2 - x,5 - x,7)
0 ... 100 mm/s 1 mm/s
Mode 5 Time delay LIM 1
Default value: 10 s
The range of the adjustable time delay is from 0 ... 100 s. in steps of
1 second. The parameter is only effective when there is a limit exceedance.
Note:
The minimum setting „0" corresponds to a time delay of 1 second.
Mode 6 Time delay LIM 2
Default value: 5 s
The range of the adjustable time delay is from 0 ... 100 s. in steps of
1 second. The parameter is only effective when there is a limit exceedance.
Note:
The minimum setting „0" corresponds to a time delay of 1 second.
Mode 7 High-pass filter value
Default value: 10 Hz
Entered value Active filter value
1 1 Hz (Vers. > 2.8)
10 10 Hz

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5.4 Parameter: Group 2
Mode 1 Code number
Value: 22
Mode 2 Sensor sensitivity
Default value: 100 mV/mm/s
At the same time the sensitivity of an acceleration sensor is selected, the
integration for conversion of vibration acceleration to vibration velocity is
activated.
Selection Value Sensor for Requirement
1 70 mV/mm/s v
2 100 mV/mm/s v
3 100 mV/g a -24 V
4 10 mV/g a + 4 mA
5 100 mV/g a + 4 mA
6 10 mV/g a -24 V
Meaning: a = Vibration acceleration
v = Vibration velocity
Mode 3 Correction factor
Default value: 1.00
To allow sensors which have a sensitivity other than those listed in parameter
2 of Group 2 to be used with the instrument, the selected value can be
corrected with a factor in the range 0.1 to 1.99.
Mode 4 DC Current output range
Default value: 4 … 20 mA
Selection Range
0 0 ... 20 mA
4 4 ... 20 mA

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Mode 5 Limit relays operating mode
Default value: 0
This parameter affects both limit relays.
Selection Mode
0 Normally energized
1 Normally de-energized
Normally energized: The relay de-energizes when the limit
is exceeded
Normally de-energized: The relay energizes when the limit is
exceeded
Mode 6 LED 7-segment display
Default value: 0
With this parameter the duration and intensity of the LED seven-segment
display is set up.
Selection Mode
0 after 3 minutes the LED display goes off.
1 ... 3 The display switches on with maximum
brightness. After 3 minutes the brightness
is reduced to the selected factor.
Larger number = Brighter display
4 Permanent display with maximum
brightness