ElmoMC SimplIQ Digital Servo Drives-Trombone Installation Guide - Manual (Page 23)

Trombone Installation Guide Installation
MAN-TROIG (Ver. 1.403)
www.elmomc.com
23
3.5.2. Grounds and Returns
The “Returns” of the Trombone are structured internally in a star configuration. The returns in
each functional block are listed below:
Functional Block Return Pin
RS232 Communications RS232_COMRET (J1/3)
CAN Communications CAN_COMRET (J1/34)
Control section COMRET (J1/6)
Aux. Feedback SUPRET (J1/32)
Main Feedback/ Analog input SUPRET (J2/2)
The returns above are all shorted within the control section of the Trombone, in a topology
that results in optimum performance.
1. When wiring the traces of the above functions, on the Integration Board, the Returns of
each function must be wired separately to its designated terminal on the Trombone. DO
NOT USE A COMMON GROUND PLANE. Shorting the common returns on the Integration
Board may cause performance degradation (ground loops, etc.).
2. Inputs: The 6 digital inputs are optically isolated from the other parts of the Trombone.
Each input has its own return line, INRET#. To retain isolation, the Input Return pins and all
other conductors on the input circuit, must be laid out separately.
3. Outputs: The 4 digital outputs are optically isolated from the other parts of the Trombone.
Each output has its own return line, OUTRET# that is also optically isolated. To retain
isolation, all the output circuit conductors must be laid out separately.
4. Return Traces: The return traces should be as large as possible, but without shorting each
other, and with minimal crossover.
5. Main Power Supply and Motor Traces: The power traces must be kept as far away as
possible from the feedback, control and communication traces.
6. PE Terminal: The PE (Protective Earth) terminal is connected directly to the Trombone‘s
heat-sink. The heat-sink serves as an EMI common plane. The PE terminal should be
connected to the system’s Protective Earth. Any other metallic parts (such as the chassis) of
the assembly should be connected to the Protective Earth as well.
7. Under normal operating conditions, the PE trace carries no current. The only time these
traces carry current is under abnormal conditions (such as when the device has become a
potential shock or fire hazard while conducting external EMI interferences directly to
ground). When connected properly, the PE trace prevents these hazards from affecting the
drive.
Caution:
Follow these instructions to ensure safe and proper implementation. Failure to
meet any of the above-mentioned requirements can result in
drive/controller/host failure.