Table of Contents
Advertisement
velocity of the system depending on the number of poles of the resolver. See the table below to determine the proper setting for this
parameter. Make sure that the maximum speed required for your application is within the allowable range based on this value.
The Equivalent Lines Per Rev will also define the Simulated Encoder Output resolution. The Simulated Encoder Output will be equal
to this value * 4 (due to Quadrature signal).
Resolver Poles
The Resolver Poles parameter is used to tell the Unidrive SP/Digitax ST how many electrical cycles of the resolver will been seen
per single mechanical revolution. The formula for the number of electrical cycles per rev is as follows:
# of resolver poles / 2 = # of electrical cycles per rev
Therefore, with a 2-pole resolver, the Unidrive SP/Digitax ST will see one electrical cycle per revolution. With a 4-pole resolver, the
Unidrive SP/Digitax ST will see two electrical cycles per revolution, and so on. If a resolver is not a 2-pole resolver, then the number
of poles of the resolver must match the number of poles of the motor.
The Unidrive SP/Digitax ST supports 2, 4, 6, or 8-pole resolvers. Configure this parameter to match the actual resolver poles.
Wire Break Detect Enable
This parameter is used to enable or disable error checking on the resolver feedback signal wires. If the Wire Break Detect check box
is clear, then the Unidrive SP/Digitax ST is not trying to detect errors on the feedback signals that would signify a broken wire. When
the Wire Break Detect check box is selected (default), then the Unidrive SP/Digitax ST will trip if it detects an error on the feedback
signals indicating a broken wire.
Simulated Encoder Output Parameters
Encoder Simulation Source
The SM-Resolver module has a feature that allows the user to use a simulated quadrature encoder output signal for an external
device. The Encoder Simulation Source is used to define the Source of the quadrature encoder output signal. By default, the Source
will be configured as the SM-Resolver position (x.05) meaning that the resolver signal will be duplicated by a quadrature encoder
output signal. Any drive parameter in the form of a 0-65535 rollover counter can be used as the source parameter. Use this field to
enter the desired drive source parameter (between 00.00 and 21.51).
Encoder Simulation Numerator
To add some flexibility to the Simulated Encoder Output signal, the Unidrive SP/Digitax ST allows the user to scale the output signal
by multiplying the Source with scaling factor called, Encoder Simulation Numerator. By default, the Encoder Simulation Numerator is
1.000 implying that the actual output value is equal to the Source value. The actual scaling factor applied changes based on the true
resolution of the resolver. Please refer to the chart below to determine the correct Encoder Simulation Numerator based on your
desired ratio.
8.3.6
SM-DeviceNet Module View
If DeviceNet is selected in the Slot # Module list box, the remainder of the view will have configuration parameters to define the
64
Equivalent Lines
Resolver Poles
Per Revolution
2
4096
2
1024
2
256
4
4096
4
1024
4
256
6
4096
6
1024
6
256
8
4096
8
1024
8
256
Encoder Simulation
Numerator
0.0000 to 0.0312
0.0313 to 0.0625
0.0626 to 0.1250
0.1251 to 0.2500
0.2501 to 0.5000
0.5001 to 3.0000
www.controltechniques.com
Operating
Speed Limit Max
Resolution (bits)
14
3,300.0
12
13,200.0
10
40,000.0
14
1,650.0
12
6,600.0
10
26,400.0
14
1,100.0
12
4,400.0
10
17,600.0
14
825.0
12
3,300.0
10
13,200.0
Resolver Resolution
14-bit
12-bit
10-bit
1/32
1/8
1/2
1/16
1/8
1/2
1/8
1/8
1/2
1/4
1/4
1/2
1/2
1/2
1/2
1
1
1
EZMotion User/Programming Guide
Revision: A8
Advertisement
Table of Contents
