VME Crates Fans are set to alarm when their speed exceeds 3800 RPM or falls below 1000 RPM. The fans tend to have noisy readings which jump up to 80 RPM around the software set fans speed. Fan speeds are adjustable from 1200 RPM to 3120 RPM. Once the Electronics House has been fully populated and the cooling system broken in, the fans speeds warnings and alarms will be set closer to the actual settings. The crate has a hardware auto shut off in the event of a fan failure. The bin and power supply temperature starts a warning at 40 degrees C and sounds the alarm at 45 degrees C. The inlet temperature starts a warning at 30 degrees C and sounds the alarm at 35 degrees C. With the power off, the inlet temperature is about 3 degrees higher than the bin temperature. An alarm deadband of 1 degrees C has been set for the temperature readings because they fluctuate by a couple degrees. The power supplies, which tend to fluctuate more have a deadband of 3 degrees C. Thus the alarm will be triggered when the temperature peaks at the alarm temperature but when the temperature drops, it must drop below the deadband before the alarm goes away. The VME Crate preliminary specification stated that automatic shutoff would ensue at 50 degrees C and that the temperature rise of a loaded crate would be only 10 degrees C. The power supply's +5V will trigger a warning when it deviates beyond (4.75, 5.25). An alarm will occur when it deviates from (4.5, 5.5). The +12V warnings start when the voltage leaves the (11.5, 12.5) range and triggers an alarm when it leaves (11, 13). The warnings for the -12V supply start below -12.5V or above -11.5V with the alarm state below -13V or above -11V. The -12V PS will fluctuate readings from -12.8 to +12.8 causing alarms on the 6U VME Crates when the crate is powered down. Thus, the database record will be disabled when the crate is turned off. If +5V currents exceed 375A, a warning is triggered; above 400A, an alarm sounds. The crate must draw 0.1A of current to avoid an alarm and 0.3A to avoid a warning. For the +12V supply, 35A triggers a warning, 40A triggers an alarm. The current should exceed 0.01A to avoid an alarm and 0.05A to avoid the warning. For the -12V supply, 35A triggers a warning, 40A triggers an alarm. When the crate is simply disconnected from the CAN Bus, some alarms will go into alarm but not the invalid state. Using the Alarm Handler, one can see the reason for the alarm like . If a disconnected occurred, it would probably say . Some other TIMEOUT errors occur when the CAN Bus is not given enough time to respond to the database queries. All other alarms have been set in hardware. Most indicators are scanned at 1 second intervals. VME Crate Summary Fans [1000 RPM, 3800 RPM] Bin [, (0C, 40C), 45C], deadband 1C Inlet [, (0C, 30C), 35C], deadband 1C PS [, (0C, 40C), 45C], deadband 3C +5V [4.5V, (4.75V, 5.25V), 5.5V] [0.1A, (0.3A, 375A), 400A] +12V [11V, (11.5V, 12.5V), 13V] [0.01A, (0.05A, 35A), 40A] -12V [, (, 35A), 40A]