Power specifications for the DeltaV MD20 and MD30 Base Smart
Switches
Installation notes
As shown in the figure, a
detachable screw terminal block is used to supply the required power to the
switches.
A ground screw on the left
side of the switch's mounting chassis connects to an instrumentation ground to
provide a shield ground for the switch and device communication cables.
Power specifications
Table: Power specifications for the MD20 and MD30 Base Smart
Switches
Item
Specification
Input voltage
+18 to +32 VDC
Alarm contacts
Normally closed. Changes to Open if:
Power supply fails
Internal voltage
supply fails
Self-test failure
occurs
Mounting
Vertically on a horizontal DIN rail.
Figure: Power connectors on the bottom of the MD20 and MD30
switches
