Lighting Controls Blue Box LT Series Installation, Operation & Maintenance Manual page 60

60
HARDWARE TROUBLESHOOTING
RELAY TROUBLESHOOTING
This section contains the most common problems, causes
and solutions for troubleshooting relays . These specific
issues will be covered in depth:
• Relay(s) stuck open / stuck closed
• Light turns OFF by itself after a certain period of time
• Light turns ON by itself after a certain period of time
• Relay(s) chattering
PROBLEM: Relay(s) not working:
Relay may be stuck to its previous state and need to be cycled
• Go to "Manual Override" screen
• Try to cycle the relay ON/OFF
• If successful, the physical relay status and the on-
screen status indicator will change, in addition the
relay should start clicking
QUESTION:
Is the relay "Stuck Open"?
Stuck Open – Lights are constantly OFF, no continuity
across the relay when you measure across line & load, and
no voltage going to the load side of the relay
a) Check the circuit breaker:
• Verify the breaker is set to the ON position
• If necessary, measure voltage on Line Side of relay .
b) Next, find out what type of relay it is:
• "Normally Open Relay"
• "Normally Closed Relay"
c) If the relay is "Stuck Open" and it is a Normally
Closed Relay (relays are defaulted to the "Nor-
mally Closed" position):
• Unplug the relay jumper to cut the power of the
relay and it should go to its failed state
• The relay is "Normally Closed" so it should fail closed
• The red LED on the relay should be OFF
• There should be continuity if you measured across
the relay . There should be voltage going to the
load side
THE BLUE BOX LT HARDWARE TROUBLESHOOTING
Is the relay "Stuck Closed"?
Stuck Closed – Lights are constantly ON, there's continuity
across the relay when you measure across line & load, and
there's voltage (120/277) going to the load side of the relay
a) If the relay is "Stuck Closed" and it is a Normally
Open Relay:
• Unplug the relay jumper to cut the power to the
relay; if the relay is "Normally Open" it should go
to its fail state, it should fail open .
• The red LED on the relay should be OFF, if not
Troubleshooting to check:
. . . I f the relay is bad:
• Swap relay with a known working relay or use a spare
• Then cycle the relay ON & OFF
• If spare relay works, the relay may be bad; contact
LC&D Technical Support for a replacement .
• If not, there is a possible loose ribbon cable .
i . Unplug, then plug the ribbon cable back
ii . Cycle the relays ON & OFF
. . . I f the Relay Jumper is bad:
• Change the relay jumper cable by using the jumper
cable from a known working relay
• Cycle the relay ON & OFF
• If not fixed, the relay jumper cable is bad; contact
LC&D Technical Support for a replacement .
. . . I f the Ribbon Cable is bad:
• Change ribbon cable using a cable from another
panel if available
• Then cycle the relay ON & OFF
• If not fixed, this is a bad Ribbon Cable; contact
LC&D Technical Support for a replacement .
. . . I f the Smacker Strip is bad:
• Change the smacker strip using a known working
smacker strip
• Cycle the relay ON & OFF