Siemens SIMOTICS HT Series, Operating Instructions & Installation Instructions

Page: 103 / 128

9.1.10 Maintaining terminal boxes
Requirement
The machine is de-energized.
Checking the terminal box
● Terminal boxes must be regularly checked for tightness, undamaged insulation, and tight
terminal connections.
● If dust or humidity have infiltrated the terminal box, this should be cleaned and dried
(particularly the insulators).
Check all the seals and sealing surfaces and address the cause of the leakiness.
● Check the insulators, connectors and cable connections in the terminal box.
● Replace any damaged components.
WARNING
Short-circuit hazard
Short-circuits can occur as a result of damaged components. This can result in death,
serious injury or material damage.
Replace damaged components.
9.2 Corrective Maintenance
Observe the following when carrying out any work on the machine:
● Comply with the general safety instructions (Page 13)
● Comply with the applicable national and sector-specific regulations.
● When using the machine within the European Union, comply with the specifications laid
down in EN 50110‑1 regarding safe operation of electrical equipment.
WARNING
Strong magnetic field when the machine is open
A strong magnetic field is always present inside the machine. If the housing is open, e.g.
when maintenance openings are open or when working inside the machine, magnetic objects
can be suddenly attracted by this magnetic field. This can result in death, severe injury or
material damage.
● Repairs are only permissible within the scope of the work described in these operating
instructions.
● For repairs that go beyond this scope, please contact the Service Center.
Maintenance
9.2 Corrective Maintenance
SIMOTICS HT Series HT-direct 1FW4...1......A
Operating Instructions 11/2018
103