Installing the RD750
ADVANCED MICRO CONTROLS INC.
18
Setting Encoder Jumper and DIP Switches (continued)
Determining Settings for Other Resolvers (continued)
TR Setting for Transmitter Resolvers
Referring back to figure 7,
on page 16, the “Optimal TR” column is the median value of
the range listed in the “TR Range” column. If your resolver’s TR falls within the listed range, the setting will
work with the RD750. For example, if your resolver has a TR of 0.45, any “Optimal TR” setting in the table
from 0.83 to 0.32 will work, but the setting that is optimized for 0.45 gives the RD750 the widest range of
adjustment to compensate for variations in the resolver’s TR.
Note that the TR setting also sets the value of the RD750’s reference voltage. Operating a resolver at a volt-
age below its specified value
never
affects the accuracy of the resolver. Operating a resolver at a voltage
above its specified value
rarely
affects the accuracy of the resolver and this only occurs if the input power sat-
urates the cores of the resolver. The RD750’s Analog Buffer minimizes the risk of this happening when you
operate the resolver above its specified reference voltage. If you have concerns about operating your resolver
at a higher reference voltage, you can choose your TR setting based on the reference voltage. However, the
TR of your resolver must fall within the TR Range listed for that reference voltage.
TR Setting for Control Transformer Resolvers
Determining the TR setting for a control transformer resolver requires powering the system and either mea-
suring the resolver signals or using the resolver status LED as feedback. For now, set the TR DIP switches to
a value of 0.5. The procedure for setting the TR of a control transformer resolver is presented at the end of
this chapter in the
Determining the TR Setting of a Control Transformer Resolver
section starting on page
21.
