Siemens Sinamics S120 Manual page 654

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11.4 DC link rectifier adapter for Booksize format

Fire hazard and device damage through ground fault / short-circuit

The DC link connection cables must be laid so that a ground fault or short-circuit is

impossible. A ground fault can cause a fire with smoke development.

• Use the local installation regulations to avoid this fault.

• Protect the cables against mechanical damage.

Also implement one of the following measures:

• Use cables with double insulation.

• Maintain adequate clearance, e.g. by using spacers.

• Lay the cables in separate cable ducts or conduits.

Fire hazard due to overheating when permissible cable lengths are exceeded

Excessively long cable lengths can cause components to overheat with the associated risk

of fire and development of smoke.

• The total length of the DC link (including the connection cables) must not exceed 10 m.

Danger to life through electric shock due to incorrectly laid 24 V supply cables

If supply cables are laid without safe electrical separation, the insulation can fail with an

electric shock.

• Maintain a clearance of at least 100 mm between the 24 V supply cables and the DC

• Or use cables with double insulation (e.g. sheathed cables) for the 24 V supply cables.

link connecting cables.

Booksize Power Units

Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6