Introduction to the RD750
ADVANCED MICRO CONTROLS INC.
12
Compatible Sensors
The RD750 is compatible with a broad range of resolvers and variable reluctance transducers including those
listed below that are commonly used in VFD and servo systems.
Table 1 Common Resolver Sensors
Resolver Transmitters
Resolver transmitters have the rotor as their primary winding. The excitation voltage is applied to the primary
and the return signals are read off of the sine/cosine stators. The RD750 is designed to be compatible with all
common 1 kHz to 20 kHz resolver transmitters.
Resolver Control Transformers
Resolver control transformers have the stators as their primary windings. Two voltages are applied to the
resolver that defines an electrical angle. The rotor output voltage and phase is equal to the difference between
the electrical angle supplied through the stators and the mechanical angle of the resolver’s shaft.
When using the RD750, it is possible to operate a control transformer “backwards” by applying the signal to
the rotor and reading the resulting stator waveforms. You must be aware of the following when using con-
trols transformers:
The operating frequency remains the same.
The transformation ratio will not be what is stated on the resolver’s label or its specifications sheet.
Most likely, it won’t even be the reciprocal of the specification. If you have an oscilloscope, you can
easily measure and calculate the TR, or you can use the RD750 to determine settings that will work for
the module.
Positional accuracy will suffer. The final accuracy will depend on the resolver you use, but 10 bit accu-
racy or better (
20 min) is typical.
Repeatability, as opposed to accuracy, will remain extremely high, typically ±1 count regardless of your
resolution setting.
Manufacturer
Model #
Speed Specified
Freq.
Specified
TR
Specified
Voltage
AMCI
R11X-C10/7
1X
1 kHz
0.45
6.0 Vac
AMCI
R11X-J10/7
1X
5 kHz
0.95
7.0 Vac
Moog /
Poly-Scientific
JSSB-21-B-02J
1X
6.6 kHz
1.00
7.5 Vac
Reliance/
Tamagawa
800123-2R/
TS-2014N181E32
1X
2.4 kHz
0.45
26 Vac
Reliance/
Tamagawa
800123-2S/
TS-2014N182E32
2X
2.4 kHz
0.45
26 Vac
Reliance/
Tamagawa
800123-2T/
TS-2014N185E32
5X
2.4 kHz
0.45
26 Vac
Reliance/
Tamagawa
800123-R/
TS-2087N1E9
1X
2.4 kHz
0.45
26 Vac
Reliance/
Tamagawa
800123-S/
TS-2087N2E9
2X
2.4 kHz
0.45
26 Vac
Reliance/
Tamagawa
800123-T/
TS-2087N5E9
5X
2.4 kHz
0.45
26 Vac
Reliance/
Tamagawa
800123-1R/
TS-2087N11E9
1X
2.4 kHz
0.45
26 Vac
Reliance/
Tamagawa
800123-1S/
TS-2087N12E9
2X
2.4 kHz
0.45
26 Vac
