User manual

Diagnostics & Troubleshooting
Thermal Shut-Down
7-10 July 2004 Wide Bank 28 DS3 - Release 2.4
Thermal Shut-Down
The Wide Bank is designed for continuous operation at ambient temperatures up to 104
º
F (40
º
C) and
for short-term operation at ambient temperatures up to 131
º
F (55
º
C).
At higher ambient temperatures, the Wide Bank uses internal thermal protectors to automatically shut
down operation before any damage occurs. Prior to shutdown, the Wide Bank will issue an over
temperature alarm to notify the network of an impending thermal shutdown. The Wide Bank will remain
shutdown until the temperature inside the unit falls below 158
º
F (70
º
C), then it will automatically reset
and resume normal operation.
If thermal shutdown occurs, do the following:
 Ensure that –48 VDC power is supplied to both the A and B power inputs when redundant
Controller cards are installed. (With only one input, the powered Controller must deliver twice as
much power, making its power converter operate at a higher temperature.)
 Verify that the Wide Bank is properly ventilated to allow for heat dissipation. (Non-FFO equipped
units require free air space between units for ventilation.)
 Reduce the ambient temperature if necessary.