Prepare The Mating Faces (Im B3) - Siemens SIMOTICS FD 1MH1 Operating Instructions & Installation Instructions

Measuring the polarization index
1. To determine the polarization index, measure the insulation resistances after one minute
2. Express the measured values as a ratio:
For insulation resistances > 5000 MΩ, the measurement of the PI is no longer meaningful and
consequently not included in the assessment.
NOTICE
Damage to insulation
If the critical insulation resistance is reached or undershot, this can damage the insulation
and cause voltage flashovers.
● Contact the Service Center (Page 177).
● If the measured value is close to the critical value, you must subsequently check the
Limit values of the anti-condensation heating insulation resistance
The insulation resistance of the anti-condensation heating with respect to the machine housing
should not be lower than 1 MΩ when measured at 500 V DC.
5.1.4

Prepare the mating faces (IM B3)

● Ensure that the foundation faces are flat and free of contaminations.
● Check the dimensions of the mounting-foot holes.
See also
Lifting and transportation (Page 45)
Service and Support (Page 177)
SIMOTICS FD 1MH1
Operating Instructions 08/2017
and ten minutes.
PI = R / R
insul 10 min insul 1 min
Many measuring devices display these values automatically following the measurement.
R / R
(10 min) (1 min)
≥ 2
< 2
insulation resistance at shorter intervals.
Note
Shims
To establish a defined mounting surface, you can order shims (option L31) from our Service
Center.
Assessment
Insulation in good condition
Dependent on the complete diagnosis of the insulation
Assembly
5.1 Preparations for installation
63