GE IC800SSI107RP2-CE VersaMotion S2K controller

Auxiliary Encoder Input

The auxiliary encoder input is a flexible input that can be used as a master input for cam or electronic gearing applications, 

a secondary position monitor, a remote axis position feedback or as secondary position 

feedback for dual position loop control for the S2K servo controllers. 

The auxiliary encoder is selected as the master position source for camming by setting the Cam Shaft Position Type (CAT) equal to PSX. 

The auxiliary encoder is the default command source when gearing is enabled (GRE=1). 

If the Handwheel Input is enabled (HWE=1), digital inputs 5 and 6 are used for connecting 

an A/B type hand wheel for use as the gearing command source instead of the auxiliary encoder.

If the Position Feedback Enable is set (PFE=1), the axis position (PSA) is updated from the auxiliary 

encoder rather than the motor encoder. In addition, when the Position Feedback Numerator (PFN) is 

non-zero the S2K controller uses a dual position loop mode where the motor encoder is used for the 

primary position loop and the auxiliary encoder is used for secondary position loop. 

In this case the auxiliary encoder should be connected to the load to allow the S2K to accurately control 

the load position without the effects of lost motion from the mechanics. 

This dual loop arrangement is a very powerful feature that provides excellent servo stability 

while eliminating the inaccuracy caused by backlash and compliance in the system mechanics. 

The auxiliary encoder input is connected on the Auxiliary I/O connector for the STI105, SSI104, SSI107, 

and SSI407 models and to the Pulse Input connector for cable for best noise immunity. 

Connect the cable and shield as shown in Section 3.6.10, Connection Diagrams. 

The auxiliary encoder inputs are labeled with “IN_” prefix on these diagrams.

The S2K controller includes an electronic gearing mode that allows the motor 

to follow a master encoder (follower) or pulse command source (stepper emulator). 

The Auxiliary Encoder Type (QTX) register configures this input for one of the following signal types:

• Pulse/Direction input

• CCW/CW pulse input

• Quadrature (encoder) input

•The shaft of the S-series servo motor is treated with grease (Shell Oil Alvania No. 2) for

corrosion protection during storage. Consider the effect of the grease on any plastic parts

that are mated with the shaft.

•The optional servo motor brake should be used for holding stationary loads only. Do not

use this brake to stop a moving load, or reduced life or damage to the brake may occur.

Apply this brake only after the motor is stopped.

Heat Load and Cooling

The heat load of the S2K Series controllers is dependent on the model as shown below:

Stepper Controller

Model SSI105: Heat Load = 20 Watts + (0.3 * current setting in percent) or 50 watts max.

The controllers must be installed vertically for effective cooling. 

Allow a minimum clearance of 3 inches above and below the unit. 

A minimum of 2 to 3 inches clearance is also

recommended on the right and left sides of the unit where possible.

Note: For UL approved installation of the following controllers, maximum ambient

temperature is 40°C (104°F): IC800SSI216P2, IC800SSI216RP2, IC800SSI216D2,

IC800SSI216RD2, IC800SSI228P2, IC800SSI228RP2, IC800SSI228D2,

IC800SSI228RD2, IC800SSI407RS1, IC800SSI407RP2, IC800SSI407RD2,

IC800SSI420RP2, IC800SSI420RD2

If an Auxiliary Encoder Input is being driven by a 26LS31 or equivalent differential line  driver, 

it is recommended that a 120-ohm parallel termination resistor be used (please see  specifications for RS422 communications for details). 

If being used in a singled-ended  circuit, see the section called “Tie” below.  

Note that the S2K Primary Encoder feedback receivers have internal termination resistors.  

Note that on the SSI216, SSI228, and SSI420 models, the auxiliary encoder input and the  

+5Vdc output are located on the Pulse Input connector on the bottom of the controller. 

The  internal schematic for the encoder input circuit is shown below.

We have the same series of models in stock. 

If you don't find the model you need, please contact us and we will provide you with an official quotation！

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