The ProAct digital electronics include settings for either droop or isochronous
operation. Start, idle, and rated speeds may be set. Separate droop schedules are
available for rated and idle. Variable speeds may be controlled by external input.
The rates that the speed setting can be raised or lowered may also be adjusted.
Fuel limits may be imposed for No Load, Full Load, Start-up (start-fuel limit), and
Idle speed. A two-slope torque limit is available. Separate ramp times may be
established for acceleration and deceleration. Speeds for rated, idle, raise limit,
and lower limit are also easily preset.
In the field of industrial automation, 8273-140 digital governor is widely used in
speed control and position control of various motors,
which can improve production efficiency and product quality.

When redundant power supplies are running, current sharing circuitry balances the load to reduce heat
and improve the reliability of the power supplies. In the event that one supply needs replacement, this
feature also ensures hot replacement of the power supplies without disrupting the operation of the control.
Each main power supply has four LEDs to indicate power supply health (OK, Input Fault,
Overtemperature, and Power Supply Fault). See MicroNet Expansion Power Supply Troubleshooting
(Section 4.13.1) for a description of the LED indications.
Input power connections are made to the power supply through terminals on the front of the power supply.
For redundant operation, the control can use any combination of power supplies.
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