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INM 9370-RD Rev 5
21
NOTE
THE POWER LED WILL NOT LIGHT UNTIL THE VOLTAGE AT THE BARRIER HAS
RISEN TO A VALUE OF AT LEAST 15.7V, BUT COULD REMAIN LIT EVEN AFTER THE
VOLTAGE HAS DROPPED TO AROUND 13.0V. DO NOT ASSUME THE POWER LED
INDICATES A VOLTAGE OF 16V OR MORE.
If the green Power LED is not lit, check:
• the polarity and integrity of the trunk cable connections to the enclosure.
• that the d.c. supply powering the incoming trunk is operating correctly.
Spur LEDs
The following tables show the possible modes of operation of the spur LEDs on the
barriers and their associated meanings.
Colour
Description
Visual
Green steady
Active spur, OK
Green flashing
1
Active spur, open circuit
Green pulsed
2
Standby spur, OK
Yellow flashing
1
Active spur, short circuit, current limit
Yellow steady
Active spur, short to shield
Red pulsed
2
Standby spur, internal fault
Red steady
Active and standby spurs, internal fault
Notes:
1
Two flashes per second
2
Short pulses every two seconds
CAUTION
937X-FB Fieldbus Barrier enclosures are designed to operate reliably in
industrial environments and comply with international standards for immunity
to electromagnetic raditation. However, damage may occur if the apparatus
is exposed to extreme levels of radiated electrical noise, for example from
“walkie-talkie” radios, or electric arc-welding. If local welding activity is
unavoidable, power should first be removed from the Fieldbus Barrier.