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Operation
8.4 Switching off the machine
8.3.5
Measuring the insulation resistance after an extended non-operational period
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 47)
8.4
Switching off the machine
● Do not switch off the water-cooling system immediately after switching off the machine.
See also
Avoidance of condensation or formation of condensation within the machine (Page 91)
8.5
Switching on again after an emergency switching-off
● Check the machine before recommissioning the driven machine after an Emergency Off.
● Eliminate all the causes that have led to the emergency off
8.6
Decommissioning the machine
NOTICE
Damage as a result of an extended period out of service
If the machine is going to be out of service for longer than six months, then take the necessary
measures for preservation and storing. Otherwise damage to the machine will result.
92
Wait for the machine to cool. This will prevent the accumulation of residual heat.
SIMOTICS HT Series HT-direct 1FW4...1......A
Operating Instructions 11/2018
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