| Most loop power supply units function as an isolator,
however, they cannot always be used in applications requiring a four-wire
device. In two-wire transmission applications (often referred to as
"loop-powered"), the connection between power supply, load
and transmitter is in series. The (+) side of the power supply is
connected to the (+) side of the transmitter, and the (-) side of
that is internally connected to the load. In this situation, the transmitter
and load cannot be separated as needed for the two-wire application.
This kind of loop power supply cannot be used as an isolator unit
for a four-wire application.
M-System's loop power supply model YVD has its power supply terminals
completely separate from the input terminals. You can use a 4 - 20mA DC signal line that is separate from the power supply line (see
drawing below). To sum it all up, the model YVD can be used as simply
an isolator or as an isolator with a two-wire transmitter power
supply, depending on how it is wired.
M-System has a flexible solution to meet your specific application
and requirements. Consult our MSS Engineering Data Book for specifications. |
Can
we use a loop power supply unit as an isolator unit having 4 - 20mA DC as
the input signal?
Yes,
M-System's loop power supply unit model YVD can be used as both a power
supply and a 4 - 20mA DC input isolator.
