GE DS215GHDCG5AZZ01A Voltage monitoring card

The Single Point Ground should be the only common point for all the ground lines. If not, ground loops may cause current flow between components of the system which can interfere with proper operation of the MMC. AC common line from the noise filter, if any. 7. The ground of the power source of the computer workstation, if any, from which you monitor the system operation. An AC outlet in the control cabinet is recommended. 8. Single point grounds from other control cabinets, if any, in the system.

Devices to be connected directly to the Single Point Ground include: 

1. Plant safety ground. 2. Chassis ground from MMC power connector. 3. The metal panel or cabinet on which the MMC is mounted. 4. "Common" or "0 V" lines from power supplies that provide external power to the I/O modules and the devices to which they are connected. 5. Chassis grounds from the devices themselves, such as device drivers, machinery, and operator interface devices.

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