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ProAct P-Series FL Position Controller
Manual 26659
84
Woodward
Error Flag
Description
Possible Source
Possible Action
CAN Demand
Fault
This error is set if the CAN
Bus is not communicating
or messages received are
slower than the configured
update rate.
Incorrect or intermittent wiring
problem.
Incorrect configuration.
ECM is not sending updates fast
enough or regularly (bursts).
CAN demand is missing (no
signal).
Incorrect Unit Number / source
address.
ECM is not sending Demand
messages, or is not sending to the
correct unit number.
CAN termination problem.
CAN wiring problem.
CAN noise problem.
CANbus incompatibility with ECM,
e.g., baud rate.
CAN traffic overload.
Check wiring for bad or lost
connection.
Verify configuration.
Verify ECM messages and
update rates. Verify configuration
of ProAct CAN Fail timeout.
Verify CANbus communication
and connections.
Check the CAN ID inputs to the
valve.
Verify that the ECM is powered
up and sending valid demand
messages, and that the correct
unit number is selected.
Check if the CANbus has the right
termination resistor connected at
both ends of the bus.
Check the CAN wiring for shorts,
open connections, interchanged
connections, and intermittent
contacts.
Verify that the CAN wiring is
installed according to the
installation instruction
Verify ECM CANbus
compatibility. Verify configured
data rate.
Verify that there is not excessive
CAN traffic that has higher
priority than the actuator
demand message.