ElmoMC SimplIQ Digital Servo Drives-Bell Installation Guide User Manual
Page 19
Bell Installation Guide
Installation
MAN-BELIG (Ver. 1.302
19
The returns above are all shorted within the Bell 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 Bell. DO NOT USE A
COMMON GROUND PLANE. Shorting the commons on the Integration Board may cause
performance degradation (ground loops, etc.).
2.
Inputs: The 6 inputs are optically isolated from the other parts of the Bell. All 6 inputs share a
single common “Return” (INRET - J1/15). To retain isolation, the Input Return pin, as well as
other conductors on the input circuit, must be laid out separately.
3.
Outputs: The 2 outputs are optically isolated from the other parts of the Bell. Each output has
a separate floating return (OUTRET1 - J1/17 for output 1 and OUTRET2 J1/16 for output 2). To
retain isolation, the Output Return pins, as well as other conductors on the output circuit,
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 cross-over.
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 terminal is connected directly to the heat-sink of the Bell. 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.