Before starting the mapping process it is a good idea to draw out a map of what you want to do. The amount of
mapping required depends on the electrical wiring of your vehicle. Check to see if the default settings satisfy your
needs before making changes.
Encoder
It is important that the encoder parameters are entered correctly. If this information is not
correct, motor control may not be possible.
General encoder settings
Encoder selection and settings applicable to all encoder types are contained in 4630
h
and 4631
h
.
Dragon8 supports four encoder types,
Resolver absolute position sensor
Sine-Cosine absolute position sensor
UVW absolute position sensor
AB incremental speed encoder
AB is not suitable for synchronous motors (e.g. permanent magnet AC).
• For sensors requiring a DC power supply (Sine-Cosine, UVW, AB), connect to the appropriate 5V
or 10V pin on the I/O header.
• If the encoder sequence is incorrect with respect to the motor, then this inversion can be performed
within 4631
h
, without rewiring the motor.
• Sensor latency compensation and advanced noise filtering is applied to all sensor types. Please
contact Sevcon for recommended settings for these items.
• If using a PMAC motor, the absolute offset of the encoder is configured in 4630
h
, sub 4. A range of
+/-180° may be input. Units are in electrical degrees.
• The software has provision for an approximate auto-detection of the encoder offset using a low-
speed rotation test, provided the motor is unloaded. Please contact Sevcon for information on this
feature.
Resolver configuration
Please refer to page 36 for electrical information on the resolver subsystem.
All resolver specific settings are located in 4632
h
.
• The controller can support multi pole-pair resolvers - . Please see page 36 for information on pole
pair values other than 1.
• The controller supports a range of resolver gains by manipulating the magnitude of the excitation
waveform. The phase of the resolver must also be compensated for, in order to achieve optimum
performance. Resolver gain and phase settings can be auto-detected by the Dragon8. Please contact
Sevcon for information on tuning resolver magnitude and gain settings.
Sin/Cos configuration
Please refer to page 35 for electrical information on the sin/cos subsystem
Sin/cos specific settings are located in 4633
h
.
• The controller can support sin/cos encoders with multiple waves-per-revolution. Please see page 35
for information on waves-per-revolution values other than 1.
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