ABB GVC736BE101  3BHE019719R0101 Embedded control card

Switching devices can sometimes have a leakage current that exceeds the ITmin (current allowed when off) of an input module. In order to use such a device, an impedance (typically, a resistor) needs to be used in parallel with the input. For example, some of the newer proximity switches use two wires instead of three. The third wire was used for a power or ground line. Without the third wire, the switch is easier to install. However, it requires more leakage current in the off state to power its internal circuitry. As a conservative estimate, use the following formula to calculate an external resistance value. It keeps the input voltage at or below 2.4V when the switching device is in the "off" state.

Replacing the MMC Battery 

Follow the procedure below to replace the MMC battery when the "P" LED is flashing. 1. After DC power has been applied to the MMC for at least five minutes, turn off power. This ensures that the contents of memory will not be lost while the battery is removed. Disconnect the input power connector from the MMC. 2. Remove the MMC (including any optional modules) from the cabinet.

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