BAPI BA/EA1 | EA1 - 2 Position Damper Actuator Interface for Belimo actuators There are many applications for 2-position actuators in HVAC. The BA/EA1 provides a simplified method for wiring and trouble shooting of up to two ?Belimo? style 2-position actuators with end switch position feedback. The BA/EA1 plugs into the BA/BP2, BA/BP4, or BA/BP8 Backplane. A green LED on the BA/EA1 lights when power is present. Easily reached on the front edge of the board are all the display LEDs, I/O connector and two actuator connectors. The BA/EA1 provides conditioned power for the actuators from the backplane. The actuator connectors provide power to the actuators and terminations for the end switch wires. The I/O connector accepts the On/Off control signal from the controller, an auxiliary end summary switch input from an adjacent EA1 and the end-switch summary output. With no input signal to the BA/EA1 both actuators are in position A. Applying 24VDC and ground to the control input connector of the BA/EA1 switches both actuators to position B. The actuators can move together or in opposite directions based on J6 J7 jumper settings. When the actuator end-switches close, an output on the BA/EA1 contact is closed. An auxiliary end switch input allows unlimited numbers of BA/EA1s to be cascaded together, with a single summary contact output indicating all end switches closed