Doc. 177/5250x
Rev A
5-2
Principle of operation
Functional description
The Clearview Display can be used to display a variety of information about the current state
of the Sevcon motor controllers to which it is connected. The information to be shown can
be configured, and the screens which can be selected during normal operation can be
configured.
Calibration functionality is provided through several screens.
This section will give a brief overview of each screen which can be enabled in the display.
Button Interface
All features on the display are controlled using the three buttons. The function of the
buttons is designed to be intuitive to use, and varies slightly depending on the operating
mode.
Power On
The Display is designed to be easily connected to a controller network, and to operate with
minimum setup or knowledge of the PDO configuration on the controllers. To achieve this,
when the system is powered on, the display performs several detection steps:
1. The display listens to the CAN bus until it successfully receives a message from a
node. This listen in process is performed for each baud rate in turn, enabling the
display to auto detect the controller baud rate.
2. The display determines which nodes are connected to the CAN bus. This is achieved
by reading product codes. For each Sevcon node discovered, the PDO mappings are
interrogated, enabling the display to “find” the I/O setup, and to determine which
motors are connected.
3. The baud rate and system configuration are stored in memory, to be re-used on
subsequent power cycles. This enables the display to start up more quickly on
subsequent power cycles.
The first time the display is powered on, there is a chance that the baud rate selection will
start at an incorrect rate. This can cause controllers to go into a CAN bus OFF state. Once
the display has powered up, it will save the baud rate that has been detected. On future
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