Anti-Condensation Heating; Fundamentals; Screws With Precote Coating; Screw Lock Washers - Siemens SIMOTICS XP 1MB5 Operating Instructions Manual

9.4.2

Anti-condensation heating

Explosion hazard due to improper maintenance of the anti-condensation heating
If the anti-condensation heating is not correctly repaired, e.g. if unauthorized or untested spare
parts are used, this can result in explosions during operation in a potentially explosive
atmosphere. This can result in death, serious injury or material damage.
• Only appropriately trained specialists in the service center are authorized to repair anti-
condensation heating systems. The anti-condensation heating must then be subject to a
routine test, which requires extensive specialist knowledge.
• Only use authorized and tested spare parts.
9.4.3

Fundamentals

If possible, assemble the machine on and alignment plate. This ensures that the mounting feet
surfaces are all on the same plane.
• Position all rating and supplementary plates as in the original state.
• Where relevant, fix electric cables.
• Check the tightening torques of all screws, as well as those of screws that have not been
released.
Note
Before commencing removal, you should mark how each of the fastening elements has been
assigned, as well as how internal connections are arranged. This simplifies subsequent
reassembly.
9.4.3.1

Screws with preCOTE coating

The motor can partly be fitted with screws with preCOTE coating. To ensure screw locking, use
new screws with preCOTE coating during assembly/repair. As an alternative, use normal screws
with a threadlocker such as Loctite.
9.4.3.2

Screw lock washers

Nuts or bolts that are mounted together with locking, resilient and/or force-distributing
elements (e.g., safety plates, spring-lock washers, etc.) must be refitted together with identical,
fully functional elements.
Locking and sealing elements must always be replaced!
1MB5 shaft height 400/450
Operating Instructions, 04/2023, A5E52802354A
Maintenance
9.4 Corrective maintenance
125