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Table 35: Drive Mode Menu #2
Rock Start is a feature used with hard starting
pumps. If Rock Start is set to On, the motor will
rock back and forth based on the RockStartCycles
and the RockStart Time parameters. This rocking
occurs while the drive is in the Starting state.
After the defined cycles and the output frequency
reaches the Start Frequency, the system enters
Running mode.
The number of rock cycles to perform. Each cycle
consists of rocking backward and then forward.
The rock start cycle time is the time to complete 1
rock start cycle, including both the backward and
the forward motion.
Current rock start cycle in progress. This is NOT a
parameter to be edited. It is a channel included on
this screen for information purposes.
By default, the drive performs the rock start on
every startup when Rock Start Mode is enabled.
Selecting Setup Rock Start Enable allows the
operator to set the limit of the RockStartEnable
trigger. Rock Start will only occur when this trigger
is set during the Starting state. A default value of
0A ensures that Rock Start occurs on every motor
start. Increasing this limit results in rocking starts
ONLY if the Downhole Amps exceeds the limit
during the Starting State. Note that if Rock Starts
are initiated, the full number of RockStartCycles will
complete even if the downhole amps drops below
the specified limit.
Frequency Ramps are available only in Manual
Frequency Mode and only after the drive has
reached the Start Frequency and transitioned to
one of the Run Modes. A frequency ramp allows for
a slow fixed rate ramp when the drive frequency
setpoint changes. This ramp is only invoked when
the Ramp 1 Enable trigger is set. Note that the
ramp time is in minutes per Hertz.
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