Faults and warnings
Introduction
In the event of a fault Dragon8 takes the following action:
1. Takes action appropriate to the fault severity. This can be either derating of motor power or speed
or shutdown of the power frame.
2. Sends out an EMCY message on the CANbus and updates the highest priority fault ID in the H-
protocol.
3. Flashes the LED in a pattern determined by the fault type and severity.
4. Logs the fault for later retrieval.
Fault identification
You can identify a fault as follows:
• Pick up the EMCY on the CANbus and read the fault condition using configuration software
• Interrogate the fault on the node directly using DVT or other configuration software.
Fault list
Use DVT to access the active fault list. If you don’t have DVT you can use any configuration tool as
follows:
1. Object 5300
h
gives information about all active faults. Read sub-index 1 to get the number of active
faults. Write to sub-index 2 to select one of the active faults (0 = highest priority) and read back
sub-index 3 to read the fault ID at that index.
1. Object 5610
h
can be used to read a text description of the fault. Write the fault ID to sub-index 1
and read back the fault description from sub-index 2.
Upgrading the controller software
It is possible to field update the firmware of the Dragon8 controller, typically using Sevcon’s DVT
configuration tool.
Please contact Sevcon for assistance with this process.
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