ElmoMC SimplIQ Digital Servo Drives-Bell Installation Guide - Manual (Page 18)

Bell Installation Guide Installation
MAN-BELIG (Ver. 1.302
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18
Table of Contents
3.5. Integrating the Bell on a PCB
The Bell is designed to be mounted on a PCB, either by soldering its pins directly to the PCB or by
using suitable socket connectors. In both cases the following rules apply:
3.5.1. Traces
1. The size of the traces on the PCB (thickness and width) are determined by the current
carrying capacity required by the application.

The rated continuous current limit (Ic) of the Bell is the current used for sizing the motor
traces (M1, M2, M3, M4 and PE) and power traces (VP+, PR and PE).
 For control, feedbacks and I/O conductors the actual current is very small but “generous”
thickness and width of the conductors will contribute to a better performance and lower
levels of interference.
2. The traces should be as short as possible to minimize EMI and to minimize the heat
generated by the conductors.
3. The spacing between the high voltage conductors (VP+, PR, M1, M2, M3, M4,VL) must be at
least:

Surface layer: 1.5 mm
 Internal layer: 0.10 mm
Complying with the rules above will help satisfy UL safety standards, MIL-STD-275 and the IPC-D-
275 standard for non-coated conductors, operating at voltages lower than 100 VDC.
3.5.2. Grounds and Returns
The “returns” of the Bell are structured internally in a star configuration. The returns in each
functional block are listed:
Functional Block Return Pin
Power PR (Power Return)
Internal Switch Mode P. S. PR (Power Return)
RS232 Communications RS232_COMRET (J1/3)
CAN Communications CAN_COMRET (J1/20)
Control section Internal, not accessible
Main Feedback SUPRET (J2/2)
Aux. Feedback SUPRET (J1/4)
Analog input ANLRET (J2/2)