Grounds and returns – ElmoMC ExtrIQ Digital Servo Drives-Panther User Manual
Page 25
Panther Installation Guide
Installation
MAN-PANIG (Ver. 1.302)
25
3.5.2.
Grounds and Returns
The “Returns” of the Panther are structured internally in a star configuration. The returns in
each functional block are listed below:
Functional Block
Return Pin
RS-232 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 Panther, in a topology that
results in optimum performance.
6.
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 Panther. DO NOT
USE A COMMON GROUND PLANE. Shorting the common returns on the Integration Board
may cause performance degradation (ground loops, etc.).
7.
Inputs: The 6 digital inputs are optically isolated from the other parts of the Panther. 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.
8.
Outputs: The 4 digital outputs are optically isolated from the other parts of the Panther.
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.
9.
Return Traces: The return traces should be as large as possible, but without shorting each
other, and with minimal crossover.
10.
Main Power Supply and Motor Traces: The power traces must be kept as far away as
possible from the feedback, control and communication traces.
11.
PE Terminal: The PE (Protective Earth) terminal is connected directly to the Panther‘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.
12.
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.