MoTeC DBW-4 - Manual (Page 6)

MoTeC DBW-4 6 Introduction
PID Fault Conditions
This section describes the fault conditions for each type of PID Controller. These fault conditions will be monitored
by the ECU for safe operation. During installation and fault finding, these conditions can be examined with the Motec
DBW-4 Manager software.
Commanded Shutdown
This is not strictly an error condition, but is included with the fault flags and hence handled here. A Commanded
Shutdown occurs when the ECU sets the set point of a PID Controller to a value of 1024. All other drive by wire PID
Controllers will shutdown. For Generic PID Controllers only the controller with a set point of 1024 will be shutdown.
For safety reasons, a power cycle is required to return to normal operation.
No Config Error
This condition occurs when the unit is powered, but not yet configured. In other words the range for both feedback
inputs (analog inputs) of the PID Controller is zero (TP & TP2 for drive by wire PIDs) or when the range of the first
feedback input of the PID Controller is zero (generic PIDs). Un-configured PID Controllers will be shutdown until
configured.
Measured Value 1 & Measured Value 2 Tracking
This error condition only applies to drive by wire PID Controllers. This error condition occurs when TP & TP2 values
are not tracking to within 10% of each other for more than 2 seconds. Since safe operation can not be ensured
under this condition, all drive by wire PID Controllers will be shutdown.
Set Point and Measured Value 1 Tracking
This error applies to all PID Controller types. This error condition occurs when the feedback value for the PID and
the required set point do not correlate to within 10% for more than 1 second. For a drive by wire application, if the
throttle position differs by more than 10% from the required (specified) position for more than 1 second, the PID
Controller (and all other drive by wire PID Controllers) will be shutdown.
Status/PWM Error
This error applies to all PID Controller types. This error condition occurs when an over-current or over-temperature
condition occurs. The limit for over-current is 8A and for over-temperature in the range 160˚C to 190˚C. This
condition shuts down the PID Controller. If the PID Controller is a drive by wire type, all other drive by wire PID
Controllers will be shutdown as well. For safety a power cycle is required to clear this error.
Measured Value 1 End Of Scale
This error applies to all PID Controller types. This error condition occurs when Measured Value 1 (TP for drive by
wire PID Controllers) goes more than a certain amount above or below the calibrated maximum or minimum values
for a more than 1 second. This will cause the PID Controller to be shutdown and all PID Controllers to be shutdown if
this controller is a drive by wire type.
Measured Value 2 End Of Scale
This error only applies to drive by wire PID Controller types. This error condition occurs when Measured Value 2
(TP2 for drive by wire PID Controllers) goes more than a certain amount above or below the calibrated maximum or
minimum values for a more than 1 second. This will cause the PID Controller to be shutdown (and all drive by wire
PID Controllers to be shutdown if this controller is a drive by wire type.)
No CAN Communication
This condition can not be monitored from the MoTec DBW-4 Manager Software, but still causes the PID Controllers
to shutdown, although only temporarily. If no CAN message is received for more than 1 second, all PID Controllers
are shutdown. Once communication is re-established, operation will continue as before. No power cycle is required
to clear this error.