12
Figure 2:
Digital Inputs—Current Sensor, Supervision, and Surge Suppression
Wire fault supervision: EOL resistors are optional with the
MyDro. When utilized and installed properly (at the far end
of the cable wired parallel to the switch) they allow the
system to alarm on a wire fault. Software selection of
this is done from the touch screen. From the config
screen, go to Digital Input Setup and then Mode.
Choose Digital Input Dry Contact NF for no
EOL resistor (no wire supervision).
6. Terminate analog inputs. Two isolated analog inputs are available on the mainboard
(refer to Figure 3). These inputs can accept a 4–20 mA or 0–5 volt signal. Position
analog channel signal selector* to the left for a 4–20 mA signal and to the right for a
0–5 volt signal. If you use the auxiliary output power source, slip the ferrite core over
the postive conductor (see Figure 4A).
Warning:
Take precautions when wiring the analog inputs. Reverse polarity may
damage the main board or the sensor.
The auxiliary output on the mainboard can be used to power the transducer as
seen in Case 1 of figure 3 (250 mA maximum). When using the auxiliary output, be
aware of the voltage drop in the 4–20 mA loop when wiring to the analog inputs. The
auxiliary output supply voltage is software configurable for 12 or 24 VDC.