Power supply, potential groups
Bus Coupler power supply US
The EKM1101 Bus Coupler and the ELM9410 Power Feed Terminal require a voltage of 24 V DC for operation. They are connected via the upper 4-pin connector with the designation + and -. The supply voltage is used by the electronics of the Bus Coupler as well as for the voltage generation for the E-bus.
The voltage generation for the E-bus takes place in a DC/DC converter without electrical isolation. The E-bus is supplied with a maximum of 2,000 mA E-bus current. Power feed terminals, e.g. ELM9410, are to be inserted if the appended terminals require more current.
The fuse should have a rating of max. 1 A, depending on the required current consumption of the configured terminals.
Power contact power supply UP
The 4 connectors below that in the lower 6-pin connector with the designations + and - are to be used for the power supply to the periphery if this is needed. These feed the outgoing power contacts +/-.
The voltage for the power contacts is generated in a DC/DC converter with electrical isolation. The power contacts are supplied with a maximum of 2,000 mA. Power feed terminals, e.g. ELM9410, are to be inserted if the appended terminals require more current.
The EKM1101/ELM9410 devices re-condition the power contact supply with electrical isolation so that the downstream terminals are supplied with a stable, smoothed and monitored voltage.
The fuse should have a rating of max. 4 A, depending on the required current consumption and thus on the configured terminals.
Power contacts
The two spring contacts of the power contact connections +/- are located on the right-hand lateral surface of the Bus Coupler. The spring contacts are hidden in slots so that they can not be accidentally touched. By attaching a Bus Terminal the blade contacts on the left hand side of the Bus Terminal are connected to the spring contacts. The tongue and groove guides on the top and bottom of the Bus Coupler and of the Bus Terminals guarantees that the power contacts mate securely. The current load on the power contacts must not permanently exceed 10 A; since the output current is limited to 2 A on the part of EKM1101/ELM9410, this value is not usually exceeded.
Electrical isolation
The EKM1101/ELM9410 devices operate with three independent potential groups.
Note: All Bus Terminals feature electrical isolation from the field side to the E-bus. The E-bus is thus electrically isolated from everything else.
