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Page 146 of 277
Table 37: Current Control Mode Parameters
Parameter
Description
Drive Mode
Table 34: Drive Mode Menu, page 140
iMode Setpoint
The desired Amps. The drive speed is varied
to try to keep the Source1 value (Downhole
Amps by default) at this level.
iMode PID
‘P’
The Proportional Gain used by the
Proportional Integral Derivative (PID) control
loop used to control the drive speed. This
parameter can be changed to tune the PID for
optimal performance.
iMode PID
‘I’
The Integral Gain used by the Proportional
Integral Derivative (PID) control loop used
to control the drive speed. This parameter
can be changed to tune the PID for optimal
performance.
iMode PID ROC
PID Rate Of Change (ROC) limits how fast
the PID will change. ROC is the amount of
time it takes the PID to ramp from the drive
Min Frequency to the drive Max Frequency.
iMode Rev.Act
This should be set to “False” for current
control.
This parameter describes the
PID’s
output relationship to the control value. A PID
is forward acting if increasing the speed of the
drive increases the control value (i.e. running
the drive faster creates more downhole
current). A PID is reverse acting if increasing
the speed of the drive decreases the control
value (i.e. running the drive faster decreases
the fluid level in a tank that is being pumped
out of).
Change only if you change the Source1
channel to a channel that acts in reverse from
the pump speed.
iModeUpdateRate
Run period for the PID loop. Best practice is
to keep at the same rate as the control value
(Source1) is updated. The drive is polled
every 200 ms (and Downhole Amps is derived
from the drive output current). Change only if
the Source1 channel is changed to a device
that is polled at a different rate.
Summary of Contents for Apollo 3
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