Mi3 Nominal and Peak Power - Power Supply Specification
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Modified on: Thu, 11 Mar, 2021 at 10:14 AM
Useful information for specifying a power supply for multiple sensor installations:
Q. The manual states a maximum power draw of 6W for the M3 platform. At 24V this equates to 250mA. How is this value calculated?
A. This is a maximum power for the entire platform based on the maximum number of heads with all analog outputs active. Take for example, Mi3COMMA with 8 Mi3100 heads, with laser sighting turned on and 4 analog outputs in use.
Q. What is real world figure in a "1 head 1 box" configuration.
A. In our own tests, a single Mi3COMM box with a 10:1 LT head with 1m cable driving OUT2 for mA into a 270 Ohm load consumes 62mA @ 24V (under 1.5W). Factor in an additional 16mA for full scale output and you get 78mA @ 24V or 1.87W.
Q. How much higher is peak startup current compared to continuous current?
A. Work to a rule of thumb that peak startup current is 2.4x the continuous current. Multi-head configurations may allow a lower startup factor.
Q. How did you arrive at that value?
A. In our own tests, a single Mi3COMM box with a 10:11 LT head with 1m cable driving OUT2 for mA into a 270 Ohm load peaked at 145mA during startup. This was with a 20A benchtop linear supply that was already on and switching the power line.
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