Siemens 7MB3000 Series Operating Instructions Manual page 119

①
②
③
DO
Figure 8-17
Observe the following information on spark suppression:
• 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.
Wall-mounted device
Operating Instructions, 07/2023, A5E31930403-AB
Standard terminal block, terminal row A: Function in the analyzer
Terminal end/spark suppression
Power supply unit
Digital outputs: Contact load max. 24 V/1.7 A, AC/DC. Shown relay contacts: relay coil has zero
current
Wall-mounted device: Example of spark suppression on a relay contact
[ Ω ]
L
[ A ]
L
Connecting the device
8.2 Electrical connections
119