Siemens SIPROCESS GA700 Operating Instructions Manual page 83

①
②
③
DI ...-
P
DO
Figure 8-10
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
Rack-mounted device
Operating Instructions, A5E31874006-12
Sub-D connector, 37-pin: Pin number 6: Function in the analyzer
Terminal end/spark suppression
Power supply unit
Digital input. Floating "
via optocoupler: 0
"
"
1
"
Digital outputs: Contact load max. 24 V/1.7 A, AC/DC. Shown relay contacts: relay coil has zero
current
Rack-mounted device: Example of spark suppression on a relay contact
[ Ω ]
L
[ A ]
L
0 V (-3 ... +5 V)
24 V (15 ... 33 V)
Connecting
8.2 Electrical connections
83