Troubleshooting
6-7
Resolving a Relay Stuck Open fault
A relatively common installation issue is a RELAY STUCK OPEN fault. When this fault is in effect, the
station is unable to deliver power, and will display the following message upon power-up:
NOTE:
The exact message may vary slightly depending on the station’s software version.
In most cases, this fault is caused by either a damaged power plate connector or a wiring problem. Before
calling Coulomb Customer Support, follow these two steps to determine the cause:
1. Inspect the station’s power plate connectors
Power plate assemblies are extensively tested before being shipped. However, damage can
occur during installation. Visually inspect the power plate connectors for any damage.
Note that the contacts have a rounded leading edge. The leaf spring which applies pressure but
carries no current has a straight leading edge. The ground contacts are extended in length so
they mate first and break last for safety. Therefore, you may experience correct voltages even
though the contacts are pushed in.
If a connector is damaged, the power plate will need to be replaced by calling Coulomb Customer
Support at 1-877-850-4562.
2. If, after close visual inspection, the connectors look OK, check the voltages as described on the next
page.
If the voltages are not as expected, identify and solve any wiring problems by reviewing the
wiring instructions provided in this document, and ensuring you have followed all instructions as
described.
If you’ve completed the above steps and have eliminated the possibility of a damaged connector and a
wiring problem, and the station continues to display a Relay Stuck Open error message, call Coulomb
Customer Support at 1-877-850-4562.
)$8/7
5(/$<678&.23(1)25$66,67$1&(&$//
