GE DS215GHDQ5AZZ01A Channel isolation card

You must ensure that the "0V" or "Common" of all devices connected to the MMC are connected to Single Point Ground (SPG). Failure to do so may result in erratic operation or damage to the MMC. Examples of devices connected to the MMC include the power source that supplies 24VDC power to the MMC and devices connected to the MMC PiCPro Port or User Port. Note that some devices (for example, a Personal Computer) may have their "0V" and "Chassis" connected together internally, in which case only one connection has to be made to SPG for that device.

Controlling Heat Within the System 

The hardware MMC case is designed to promote air circulation and dissipate heat. The MMC can be mounted vertically or horizontally to take advantage of this design. Normally no fans or air conditioners are needed. However, if the environment outside the control cabinet is hot or humid, you may need to use a fan, heat exchanger, dehumidifier or air conditioner to provide the correct operating environment..

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