Siemens SIPROCESS GA700 Operating Instructions Manual page 91

Measures to suppress sparks
● To suppress sparks via relay contacts, you can use RC elements. In direct current
operation, you can also use a spark killer diode instead of the RC element.
● The RC element results in a drop-out delay for an inductive component, for example, a
solenoid valve. To rate the RC element accordingly, use the following rule of thumb:
– R [ Ω ] ≈ 0.2 x R
– C [μF] ≈ I
● You must use a non-polarized capacitor "C".
● When connecting the RC element, refer to the previous figure/figures.
See also
Spark suppression: Example (Page 89)
Rack-mounted device
Operating Instructions, 05/2015, A5E31874006-03
[ Ω ]
L
[ A ]
L
Connecting
7.1 Electrical connections
91