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6.15
System Error (OK)
The internal monitoring system monitors continuously for correct functioning of the unit. As soon as
an internal error is discovered, for example a broken sensor wire, a processor error or the non-
existence of a self-test, this is classified as a very serious situation and a system error process is
enabled.
The system error safety relay has a "break" function so that a power failure will also be detected
and considered to be a system error as well.
Whenever a system error is detected, the following actions are performed:
•
System error safety relay is activated (break)
•
Analog output drops to 0 mA
•
The "OK" LED on the front panel of the enclosure flashes
continuously for non-critical errors.
The effects of the system error relay outputs on terminal #3 and terminal #4 are isolated from
ground (GND) and are hence electrically isolated from the measuring device.
The system error output of the VC-18xx consists of two mechanical relays that are coupled in
series. This redundancy considerably increases the reliability of the System Failure Safety Relay.
During the configuration of the VC-18xx it is possible under Edit/Monitor to mark the feature "Safety
Monitor (ISO 13849-1)" and set the alarm hang time.
When this function is activated, the highly reliable System Failure Relay is activated. All Danger
alarms can be "coupled" with the System Failure Safety Relay. This drastically increases the
reliability of the danger alarm function and thus the functional safety of the machine.
NOTE!
When the protection system function is activated, this is indicated by the "Danger alarm
enabled OK relay."
NOTE!
If a system failure persists, please send your device to the manufacturer for repairs. Follow the
instructions in section 12 of this manual.
Page 42 of 110
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to indicate critical errors or is lit
© Brüel & Kjær Vibro ● C106834.002 / V06
Technical alterations reserved!
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