Emerson Epsilon Eb Series Reference Manual page 61

Epsilon Eb and E Series EN Drives Reference Manual
sink can dissipate. Each Watt of power dissipated will produce an incremental rise in
temperature. So, if the ambient temperature is lower, more wattage can be dissipated
before reaching the temperature limit of the components mounted to the heatsink.
By default, we assume an ambient temperature of 40 ° C which is the design ambient
temperature for the nominal maximum drive current. If the actual ambient is lower than
this, extra capacity is available for additional shunt power dissipation. Setting the Drive
Ambient Temperature parameter to the actual ambient temperature allows you to take
advantage of a lower temperature and could eliminate the need for an external shunt
resistor and controller.
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