Siemens SINAMICS S120 Equipment Manual page 274

Maintenance and servicing
6.4 Replacing components
Removal steps
The removal steps are numbered in accordance with the figure above.
1. Remove the mount for the CU320 (1 nut).
2. Disconnect the plug connections for the fiber optic cables and signal cables (5 plugs).
3. Remove the DRIVE-CLiQ cables and connections on -X41/-X42 (5 plugs).
4. Remove the retaining screws for the slide-in electronics unit (2 screws).
CAUTION
When removing the unit, ensure that you do not damage any signal cables.
The Control Interface Board can then be removed from the slide-in electronics unit.
CAUTION
When removing the ribbon cable's connectors, make sure that you actuate the locking lever
on the connector very carefully (e.g. with a screwdriver) because otherwise the lock could
be damaged.
Installation steps
For installation, carry out the above steps in reverse order.
CAUTION
The tightening torques specified in the table "Tightening torques for connecting current-
conducting parts" must be observed.
Carefully establish the plug connections and then ensure that they are secure.
The fiber optic cable plugs must be remounted at their original slot. Fiber optic cables and
sockets are accordingly labeled for correct assignment (U11, U21, U31).
When dealing with connectors with a lock, make sure that the locking lever is securely
engaged once connected.
The screw connections for the protective covers must only be tightened finger-tight.
274
When removing the slide-in electronics unit, 5 additional plugs (2 at the top, 3 at the
bottom) must be removed one after the other.
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A