60 THE BLUE BOX LT HARDWARE TROUBLESHOOTING
LCDBBHTS03Sept08
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
Check the circuit breaker:a)
Verify the breaker is set to the ON position•
If necessary, measure voltage on Line Side of relay.•
Next, find out what type of relay it is:b)
“Normally Open Relay”•
“Normally Closed Relay”•
If the relay is “Stuck Open” and it is a Normally c)
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
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
If the relay is “Stuck Closed” and it is a Normally a)
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:
...If 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
...If 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.
...If 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.
...If the Smacker Strip is bad:
Change the smacker strip using a known working •
smacker strip
Cycle the relay ON & OFF •
To Next Page
Loading...
Need help?
General