Installation on mounting rails

Assembly

The BC9191 is snapped onto standard 35 mm mounting rails (DIN rails according to EN 60715) by applying slight pressure:

1. Press the Bus Terminal Controller onto the mounting rail.
2. With slight pressure, two latching lugs on the right-hand side then automatically engage in the mounting rail.
3. On the left side, insert a screwdriver into the upper notch of the orange latch and engage the latch with a twisting motion.
4. Bus Terminals are now installed. To do this, plug the components together with tongue and groove and push the terminals against the mounting rail until the latch audibly engages on the mounting rail.
   If you first snap the terminals onto the mounting rail and then push them next to each other without the tongue and groove interlocking, no functional connection will be established! When correctly assembled, no significant gap should be visible between the housings.
5. If no Bus Terminals are attached, plug the K-bus cover with tongue and groove onto the BC9191 and push it against the mounting rail until the latch audibly engages on the mounting rail.

Nature and source of the danger The locking mechanism of the terminals and couplers protrudes into the profile of the mounting rail. When installing the components, make sure that the locking mechanism doesn't come into conflict with the fixing bolts of the mounting rail. For fastening mounting rails with a height of 7.5 mm under the terminals and couplers, use flat fastening components such as countersunk head screws or blind rivets.

Disassembly

The BC9191 is secured to the mounting rail on the left-hand side by an orange rotary latch and on the right-hand side by a pull latch, which must be released for removal:

1. Insert a screwdriver into the lower recess of the orange rotary latch and release it by pressing on the screwdriver. The retaining lug of the orange rotary latch then releases the mounting rail.
2. Lever the unlatching hook on the right-hand side of the BC9191 upwards with a screwdriver. An internal mechanism pulls the two latching lugs from the DIN rail back into the terminal module,
3. The lock with the mounting rail is now released and the Bus Terminal Controller can be pulled from the mounting rail without excessive force.

Connections within a Bus Terminal block

The electric connections between the Bus Terminal Controller and the Bus Terminals are automatically realized by joining the components:

• The six spring contacts of the K-bus deal with the transfer of the data and the supply of the Bus Terminal electronics.
• The power contacts deal with the supply for the field electronics and thus represent a supply rail within the Bus Terminal block. The power contacts of the BC9191 must be supplied via potential supply terminals (KL9xxx).

Power contacts During the design of a Bus Terminal block, the pin assignment of the individual Bus Terminals must be taken account of, since some types (e.g. analog Bus Terminals or digital 4-channel Bus Terminals) do not or not fully loop through the power contacts. Power supply terminals (KL91xx, KL92xx and EL91xx, EL92xx) interrupt the power contacts and thus represent the start of a new supply rail.