User guide

46 www.controltechniques.com SM-EZMotion Module User Guide
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 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 will see
one electrical cycle per revolution. With a 4-pole resolver,
the Unidrive SP 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 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 checkbox is clear, then the Unidrive SP is not trying
to detect errors on the feedback signals that would signify
a broken wire. When the Wire Break Detect checkbox is
selected (default), then the Unidrive SP 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 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.
7.2.2.6 SM-DeviceNet Module View
If DeviceNet is selected in the Slot # Module list box, the
remainder of the view should have configuration
parameters to define the properties of the DeviceNet
device and network. The hierarchy should automatically
update to show that a DeviceNet module is populated in
that specific slot, see Figure 63.
Figure 63: Slot # View (SM-DeviceNet Module)
Resolver
Poles
Equivalent
Lines Per
Revolution
Operating
Resolution
(bits)
Speed Limit Max
2 4096 14 3,300.0
2 1024 12 13,200.0
2 256 10 40,000.0
4 4096 14 1,650.0
4 1024 12 6,600.0
4 256 10 26,400.0
6 4096 14 1,100.0
6 1024 12 4,400.0
6 256 10 17,600.0
8 4096 14 825.0
8 1024 12 3,300.0
8 256 10 13,200.0
Encoder Simulation
Numerator
Resolver Resolution
14-bit 12-bit 10-bit
0.0000 to 0.0312 1/32 1/8 1/2
0.0313 to 0.0625 1/16 1/8 1/2
0.0626 to 0.1250 1/8 1/8 1/2
0.1251 to 0.2500 1/4 1/4 1/2
0.2501 to 0.5000 1/2 1/2 1/2
0.5001 to 3.0000 1 1 1