signal switch function

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The signal switch(S) will automatically be installed in an EL1490 and EL1590 devices when built at factory. Red, Green, and Black are the wires to the switch and are shown in the 1490 instructio...
One of the following items may cause the EL1490 device to retract then release: Incorrect power supply - Verify you have the PS873-2/4TD or PS914-2RS/4RL power supply. Problems with wire gauge...