User Manual

Table Of Contents

SSI Conﬁguration and Use

Advanced Digital Motor Controller User Manual 69

The count information is also used to measure rotation speed. Using the Encoder Pulse

Per Rotation (PPR) conﬁguration parameter, the output is a speed measurement in actual

RPM that is useful in closed loop speed modes where the desired speed is set as a nu-

merical value, in RPM, using a serial command.

Conﬁguring the encoder parameters is done easily using the PC Conﬁguration Utility.

SSI Conﬁguration and Use

On controller models equipped with SSI sensor inputs, SSI sensors enable a range of pre-

cision motion control features. See “Connecting SSI Sensors” page 51 for a detailed dis-

cussion on how SSI sensors work and how to physically connect them to the controller.

The diagram below shows the processing chain for each encoder input.

FIGUER 4-10.

The SSI sensor’s signal is processed to generate up and down counts depending on the

rotation direction. The counts are then summed inside a 32-bit counter. The counter can

be read directly using serial commands and/or can be used as a position feedback source

for the closed loop position mode.

Also taking into consideration that SSI sensors are absolute sensors, the sensor can be

conﬁgured in order to indicate the absolute position of the rotor shaft (Absolute Feed-

back). In that case, the counter holds the absolute position of the rotor shaft.

The count information is also used to measure rotation speed. Using the SSI Sensor Res-

olution (which represent the counts per revolution, SCPR) conﬁguration parameter, the

output is a speed measurement in actual RPM that is useful in closed loop speed modes

where the desired speed is set as a numerical value, in RPM, using a serial command.

Conﬁguring the SSI Sensor parameters is done easily using the PC Conﬁguration Utility.