© Brüel & Kjaer Vibro
● October 2017 ● C106635002 / V01 ●
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Page 13 of 20
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© Brüel & Kjaer Vibro
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Instruction VC-850
Functionality
EN
The following conditions for the relays should not be exceeded in your application:
Insulation 30 V
•
Maximum current load 100 mA
•
Max load voltage 30 V
•
ON resistance alert relay < 4 Ω
•
ON resistance danger relay < 8 Ω
•
Off state Leakage current Max 1 μA
3.20 Light Emitting Diodes (LEDs)
Three status indicating Light Emitting Diodes (LEDs) are located under the lid and the stop plug of the
VIBROCONTROL 850.
•
Power
....................... The yellow “Power” LED will light up whenever main power is applied
.................................. between the wire “+24 V” and the wire “GND”. This LED also acts as a
.................................. System Failure indicator and will start to blink if a system failure takes
.................................. place.
•
Danger
...................... The red “Danger” LED will light up as soon as the Danger alarm is
.................................. activated
•
Test
........................... The yellow “Test” LED will light up for as long as the self-test function is
.................................. activated.
3.21 Self-Test Function
The VIBROCONTROL 850 is provided with a Self-Test function that will remain activated for as long as
the “/ Self-Test” wire is connected to the “GND” wire.
The Self-Test can also be initiated by toggling the internal DIP-switch #7 from “Off” to “On”. The Self-
Test will last for as long DIP-switch #7 remains in the “On” position. Please note that the function of
DIP-switch #7 is disabled when DIP switch #6 is in “PC mode”.
The Self-Test checks a large number of the functions inside the VIBROCONTROL 850. If the Self-Test
is not passed without flaw, the system failure function will be activated.
During the Self-Test the analogue output can be set to have a certain value. If this value exceeds any
of the alarm trigger levels for at least the delay time, that particular alarm will be activated and any
relay that is dedicated to that alarm with it.
Self-Test is an often-used method to remotely reset some type of activated system failure.
3.22 Sensor Test
The VIBROCONTROL 850 has a built in surveillance system, which continuously monitors the bias
signal of the internal accelerometer. This bias signal is a measure for the health of the vibration
transducer itself. If an error in the bias of the accelerometer has been detected the system failure
function will be activated, i.e. the Danger relay is activated while the Alert relay stays inactivated.
Output current will drop to 0 mA.
