Maintaining Terminal Boxes; Measuring The Insulation Resistance During The Course Of Maintenance Work; Touch Up Any Damaged Paintwork - Siemens SIMOTICS HV C Operating And Installation Instructions

9.3.10

Maintaining terminal boxes

● For terminal boxes with type of protection "Ex d" or "Ex db", regularly inspect the cable
9.3.11

Measuring the insulation resistance during the course of maintenance work

Measuring the insulation resistance and polarization index (PI) provides information on the
condition of the machine. It is therefore important to check the insulation resistance and the
polarization index at the following times:
● Before starting up a machine for the first time
● After an extended period in storage or downtime
● Within the scope of maintenance work
The following information is provided regarding the state of the winding insulation:
● Is the winding head insulation conductively contaminated?
● Has the winding insulation absorbed moisture?
As such, you can determine whether the machine needs commissioning or any necessary
measures such as cleaning and/or drying the winding:
● Can the machine be put into operation?
● Must the windings be cleaned or dried?
Detailed information on testing and the limit values can be found here:
"Testing the insulation resistance and polarization index" (Page 41)
9.3.12

Touch up any damaged paintwork

If the paint is damaged, it must be repaired in order to protect the unit against corrosion.
Note
Paint system
Contact the Service Center (Page 111) before you repair any damage to paint. They will provide
you with more information about the correct paint system and methods of repairing paint
damage.
Complete overpainting
The paint applied must conform to the requirements to avoid electrostatic charging, see
EN 60079-0.
The repair of painted surfaces of the non-conductive paint coating up to a nominal coating
thickness of 350 μm was investigated and is acceptable.
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
Operating Instructions 06/2018
entries inside the terminal box according to IEC / EN 60079-17. Retighten the screw
fastenings if necessary.
Maintenance
9.3 Inspection and maintenance
93