Document #: 020-17475-00 Revision: E
Page #: 12 of 63
G.
SUPERCONDUCTING DRIVE UNIT CONTROL
Note: the Superconducting drive unit is sealed for water/spray resistance and has a
splash resistant control box.
General Overview
Direct reading of impeller speed of rotation is provided by a sensor ring on the levitation
head. Speed of rotation is calculated based on direct reading of the impeller
magnets.
IMPORTANT!
Correct reading of RPM is available only when the sensor ring is correctly
installed on the levitation head, the unit properly charged AND the correct impeller is
coupled above the levitation head. Incorrect readings may result in an alarm after
rotation is started.
External electrical connections are done with cables running along the frame.
The controls are located on the face panel of the control box (Figure 8). They are:
Touchscreen Controller, Quick adjustment keys, Power Switch, and Emergency Stop
push button. In addition, other connections including one for remote control are
available on the back panel of the control box as shown in Figure 9.
Most control functionality is provided to the user through the touchscreen interface
including activation of functions, display of system information, and alarm status.
The LevMixer can be operated in one of three modes selected by the operator from
the Main Menu: Manual mode, Automatic mode, and Remote mode. Each mode
includes a specific set of functions to support processing requirements.
Two auxiliary modes of operation can be activated by the system: Power Up mode
used to monitor the unit is properly charged, and Failure mode used to notify the
operator of detected malfunctions. Both auxiliary modes require operator interaction.
Note: mixing functionality is not available in either auxiliary mode.
When the drive unit is powered on it automatically begins in Power Up mode. At this
stage the system will determine the current levitation condition and provide directions
to the operator. Charging may be required as part of the power up procedure.
Operator access to the mixing functions via the Main Menu is only available after the
power up process is successfully completed.
Turning power off while the mixer is in charged condition should only be done through
the shutdown procedure. Otherwise it will be detected as an unscheduled power
outage and an alarm notification will be displayed upon next power on.
IMPORTANT!
In case of emergency the operator can stop rotation of the motor by
pressing the E-Stop button on the face panel. This can be done during any mode of
operation. Doing so halts motor rotation and activates the system Failure mode while
