Siemens SIMOTICS HT Series, Operating Instructions & Installation Instructions, Page: 100 / 128

9.1.4 General inspection
● Check that the installation conditions are observed. Perform the following checks after
approx. 16 000 operating hours or at the latest after two years:
Checking When the
motor is
running
At stand‐
still
The electrical parameters are maintained X
The permissible bearing temperatures are not exceeded (Page 85) X
The smooth running characteristics and machine running noise have not
deteriorated
X
The foundation has no cracks or indentations. (*) X X
The machine is aligned within the permissible tolerance ranges. X
All the fixing bolts/screws for the mechanical and electrical connections
have been securely tightened
X
All the potential connections, grounding connections and shield supports
are correctly seated and properly bonded
X
The winding insulation resistances are sufficiently high (Page 47) X
Any bearing insulation is fitted as shown on the plates and labels X
The CABLES and insulating parts and components are in good condition
and there is no evidence of discoloring
X
Condensation can freely flow away. X
(*) This check can be made at standstill or when running.
● If you detect any deviations during the inspection, you must rectify them immediately. They
may otherwise cause damage to the machine.
9.1.5 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:
Maintenance
9.1 Inspection and maintenance
SIMOTICS HT Series HT-direct 1FW4...1......A
100
Operating Instructions 11/2018