7-2 Siemens PM240-2_EN_rev00-30082019.docx
7. Any cable, for control or external connections for the shaft and lift car, must never run near and parallel
to the power cable, even if shielded; if parallel routing cannot be avoided, they must be in separate
metal raceways.
8. All earth connections must be as short and wide as possible.
9. To avoid unwanted tripping of the differential switch:
Make the power connection as short as possible
Use suitable differential switches (type A or B 300mA)
When possible, reduce the inverter carrier frequency: in fact, as lower is the frequency, is
greater the motor noise, but with less current leakage to earth and less EMC interference; so
the motor windings are less stressed.
7.4 SIEMENS S120 GENERAL CONCEPT OF ELECTRICAL WIRING
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