2-44 DC Bus Voltage / Memory
DC Bus Voltage /
Memory
A measure of the instantaneous value or “nominal” bus voltage determined
by heavily filtering bus voltage. Just after the pre-charge relay is closed
during the initial power-up bus pre-charge, bus memory is set equal to bus
voltage. Thereafter it is updated by ramping at a very slow rate toward
Vbus. The filtered value ramps at approximately 2.4V DC per minute (for a
480V AC drive). An increase in DC Bus memory is blocked during
deceleration to prevent a false high value due to the bus being pumped up by
regeneration. Any change to DC Bus memory is blocked during inertia ride
through.
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