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1
S
YSTEM OVERVIEW
Over temperature protection
VMS control systems are designed to protect LED signs from overheating. The VMS control system monitors the temperature at the
display adapters, NTCIP controller plate, and the power supply plates. The following information describes the conditions in which
protective measures are triggered and the actions the system takes. For information about converting Short Error Status Error Codes in
Intelligent Controls, over-temperature conditions, and status definitions information, refer to "Short error status conversion" on page A-1.
Condition 1: Measured at the display adapters
If the temperature measured at the display adapters exceeds 60° C (140° F):
•
The sign controller reduces light output to 90% of the current brightness level setting.
•
The sign controller keeps the light output at 90% of the current brightness level setting until the temperature falls below 56° C
(133° F). The NTCIP controller will report a Temperature Warning by raising bit 9 of the short error status.
•
Additional dimming will result if the temperature continues to increase. Every 4° C increase results in dimming by an additional
10%.
Condition 2: Measured at the display adapters
If the temperature measured at the display adapters exceeds 80°C (176°F):
The sign controller reduces the light output to 0%.
•
•
The sign controller keeps the light output at 0% until the temperature falls below 76° C (133° F). At this point the sign will be
allowed to display at 50% brightness.
•
The NTCIP controller will report a Temperature Warning by raising bit 9 of the short error status.
•
The NTCIP controller will report a Critical Temperature Error by raising bit 11of the short error status.
Condition 3: Measured at the controller plate or power supply housings
If the temperature at the NTCIP controller plate or at the power supply plates exceeds 71° C:
•
The NTCIP controller will report a Temperature Warning by raising bit 9 of the short error status.
Condition 4: Measured at the controller plate and power supply housings
If the temperature at the NTCIP controller plate and at the power supply plates exceeds 71° C:
•
The NTCIP controller will report a Temperature Warning by raising bit 9 of the short error status.
•
The NTCIP controller will report a Critical Temperature Error by raising bit 11 of the short error status.
Condition 5: Thermal shutdown
If the temperature at the NTCIP controller plate exceeds 71° C and the temperature at the power supply plates exceeds 71° C for
approximately an hour:
•
The NTCIP controller blanks the display and keeps the display blanked until this condition is resolved.
•
The NTCIP controller will report a Temperature Warning by raising bit 9 of the short error status.
•
The NTCIP controller will report a Critical Temperature Error by raising bit 11 of the short error status.
•
The NTCIP controller will report a Message Error by raising bit 7 of the short error status.
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(PN 1523610201
AINTENANCE
ANUAL
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REV
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