ElmoMC Gold Line Digital Servo Drives-Gold Trombone - Manual (Page 35)

Gold Trombone Installation Guide (EtherCAT and CAN) Installation
MAN-G-TROIG-EC (Ver. 1.604)
www.elmomc.com
35
4.5.2. Grounds and Returns
The “Returns” of the Gold Trombone are structured internally in a star configuration. The
returns in each functional block are listed below:
Functional Block Return Pin
CAN Communications CAN_COMRET (J2/31, 32)
USB Communications USB_COMRET (J2/43)
PHY_IN communication return PHY_IN_COMRET (J2/31)
PHY OUT communication return PHY_OUT_COMRET (J2/32)
Analog input return ANLRET (J2/20)
Common return COMRET (J1/19, J2/46)
Supply return SUPRET (J1/1, J2/25)
Table 7: Grounds and Returns
The returns above are all shorted within the control section of the Gold Trombone in a
topology that results in optimum performance.
Caution: Follow these instructions to ensure safe and proper implementation.
Failure to meet any of the below-mentioned requirements can result in
drive/controller/host failure.
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 Gold Trombone.
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 digital inputs are optically isolated from the other parts of the Gold
Trombone. All six inputs share one return line, INRET1_6. To retain isolation, the Input
Return pin 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 Gold
Trombone. Each output is related to VDDRET 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 cross-overs.
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 Gold
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.