Good DCS

ABB 1912JA001100000One Year Warranty

Description

Single point grounding of the Type SLC controller provides an analog and digital DC grounding system free of circulating currents. Jumper W106 on the power supply board (Fig. 2-3) connects the DC system common to the AC grounding conductor terminal TB3-2 ( ). Jumper W106 can be cut and removed to isolate DC system common from AC ground. Multiple Controllers If several Type SLC controllers are connected through the module bus communication link, then the system commons are also connected. For a single point grounding system, system common must be tied to earth ground only at one point. Cut and remove jumper W106 (Fig. 2-3) on the power supply board of all controllers that are to be linked together via the module bus. Use a separate 14 AWG jumper wire to connect the DC system common (TB2-1) of each controller to an isolated system common bus. From one point on the DC system common, use an eight AWG wire to connect to a dedicated earth ground (Fig. 2-4). This dedicated earth ground should connect to the same grounding point as the AC safety ground (typically the site grounding grid). There should be no more than one-ohm resistance between the DC system grounding conductor and the AC safety conductor.

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