WIKA GDM-100-T Betriebsanleitung Seite 17

5. Commissioning, operation
Inductive load with DC voltage
With DC voltage the contact protection can be achieved via a free-wheeling diode,
connected in parallel to the load. The polarity of the diode must be arranged so that it
closes when the operating voltage is on.
Example: Contact
protection measure
with free-wheeling
diode
Inductive load with AC voltage
With AC voltage two protective measures are possible:
Example: Contact
protection measure
with voltage-dependent
resistor VDR
Example: Contact
protection measure
with RC element
Capacitive load
With capacitive loads elevated switch-on currents arise. These can be reduced by
series-connecting resistors in the supply line.
Examples: Contact protection measure with current-limiting resistor
U
B
WIKA operating instructions, model GDM-100-T
Contact
Diode
R
1
Load
Load
Load
Load
U
B
R
1
Load
17
EN