Baker Hughes Apollo 3, User Manual

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3.5.2 Current Control Mode
Control mode in which the drive speed is varied in an attempt to provide a fixed output current.
Current Control is sometimes used in gassy wells, when a pump encounters a gas pocket, the
load will be reduced, and the output current of the drive will drop. The drive will speed up in an
attempt to clear the gas pocket from the pump. If the gas pocket clears, the load will return, and
the drive speed will slow back to the speed needed to maintain the specified current setpoint.
3.5.3 PID Speed Control Mode
Control mode in which the drive speed is varied in an attempt to keep a system parameter
(referred to as the control or feedback parameter) at a specified level.
Common control parameters include:
• Pump Intake Pressure (ESP system)
• Tank Level (SPS system)
3.5.4 Analog Follower Mode
Control mode in which the drive speed is based on a scaled analog input. Analog Follower mode
is often used in situations in which another controller, such as a PLC, dictates the speed at
which the drive should run.