Ambient Temperature Range; Permissible Wire Lengths And Actuating Forces - Siemens SIRIUS Configuration Manual

4.10.2

Ambient temperature range

Note
Restriction of the ambient temperature range
The thermal expansion behavior of the wire will restrict the ambient temperature range with
increasing wire length.
The following diagram shows the ambient temperature range for cable-operated switches of
type 3SE7150-.../3SE7120-... and 3SE7140-....
Tension springs are not included in the figure.
Integrity level SIL1 to SIL3 depending on the application.
4.10.3

Permissible wire lengths and actuating forces

To ensure proper operation of cable-operated switches, they must be installed with specific
preloads.
Cable-operated switches and foot switches
Configuration Manual, 09/2020, A5E43902195002A/RS-AA/001
Cable-operated switches
4.10 Mounting
19