Burkert Type 8620 - Manual (Page 75)

mxCONTROL Type 8620
Page 75
13.2 Analog 4...20 mA Outputs (Option)
The control output of the connected module output is converted to a 4…20 mA output signal as shown
in Figure 23.
The nominal resolution of the analog output circuit is 10 bit (1024 steps), but due to factory calibration
the actual resolution is lower but at least 9 bit (512 steps). The maximum load is 500
Ω.
The process values can be monitored in combination with the MONITOR_PV module; the process
value range (Scal- … Scal+) is hereby converted to a 4…20 mA output signal.
Figure 23: 4...20 mA analog output
Calibration of 4 ... 20 mA Outputs
The 4…20 mA outputs can be calibrated as specified in the following description:
→ Scroll to main menu item “Calibration” (via “arrow” keys),
press key “ENTER”.
→ Enter the specialist password (via keys „+“ and „<-“).
→ Select “Outputs”
→ Select a 4-20mA output X (via “arrow” keys),
press key “ENTER
A
R
OUTPUT
GND
(R < max. load)
→ Prepare the calibration:
connect a resistor R (< max. load (500 Ohm)) and an Ampere-meter between
pin “OUTPUT” of the output to be calibrated and pin “GND”;
remove all other connections to that OUTPUT
If there is a calibration data fault on a configured analog output, the corresponding analog
output will output 0 mA.
Functional impairments due to incorrect calibration!
The calibration may only be carried out by qualified personnel.