Power Dissipation - Racal Instruments 1260-X121 User Manual

1260-X121 User Manual
Power
Dissipation
Racal Instruments © 2005
Shock
Vibration
Bench Handling
Temperature
Operating
Non-operating
Relative Humidity
Altitude
Operating
Non-operating
Power Requirements
+5VDC
+5VDC
Weight
MTBF (MIL-HDBK-217-FN2 method)
Including relays
Safety Standard
While the cooling of the Adapt-a-Switch carrier is dependent upon
the chassis into which it is installed, the carrier can normally
dissipate approximately 160 W. The maximum power dissipation
for an individual module is 60W. Care must be taken, then, in the
selection and loading of the plug-in modules used in the carrier. It
is not possible to fully load the carrier, energize every relay, and
run full power through every set of contacts, all at the same time.
In practice this situation would never occur.
To properly evaluate the power dissipation of the plug-in modules,
examine the path resistance, the current passing through the relay
contacts, the ambient temperature, and the number of relays
closed at any one time.
For example, if a 1260-X121 module (containing 20 relays) has 5
relays closed, passing a current of 10 A, then:
Total power dissipation =
2
[(current) * (path resistance) * 5 ] + (quiescent power)
30g, 11ms, ½ sine wave
0.013in. P-P, 5-55Hz
4 in., 45°
0°C to +60°C
-40°C to +70°C
85% Max., non-condensing at
< 30°C
15,000 feet
15,000 feet
300mA Max.
40mA per energized relay.
15.71oz. (0.445kg)
783,549 hours at 25°C
718,344 hours at 30°C
EN61010-1
Pollution Degree 2
Specifications 1-3