MPS Doc: M359_USER_MANUAL REV G January 17, 2010 Page 20 of 30
5.8. UPS Response to Overtemperature Condition
When the internal hot-spot temperature of the UPS exceeds a preset level (+94
0
C), the
yellow O. TEMP Warning LED (23) will start blinking and an audible alarm will sound at one
second intervals, 50% duty cycle. Three minutes after the O. TEMP Warning LED starts
blinking (and if the temperature does not drop), the UPS will shut itself off. This condition is
indicated by the O. TEMP Shutdown red LED (24) and the OUTPUT FAIL red LED (19).
Recovery from Over Temperature Shutdown, when the temperature drops, is automatic.
In case of an Over Temperature, check the condition of the Air Filter (4) on the front panel (if
it is dirty - clean it and re-install it into the unit) and verify that when AC Output is on, the
cooling fan (31) is operating..
Figure 8: Overload (3KW) Shutdown
3 Seconds
Output Voltage (100V/Div)
Output Current (50Amp/Div)
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