Siemens S120 Instructions Manual page 45

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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.

Siemens S120_EN_rev06-08062017.docx

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