Danfoss VLT Series Service Manual page 30

Terminal No.
55 Common for analog inputs. This common is
isolated from the common of all other power
supplies. If, for example, the drive's 24 VDC
power supply is used to power an external
transducer, which provides an analog input
signal, terminal 55 must be wired to terminal
39.
60 Programmable 0 to 20 mA or 4 to 20 mA,
analog current input, Resistance = approx.
200 Ω. Used for reference or feedback
signals.
61 RS-485 common.
68, 69 RS-485 interface and serial communication.
1-10
VLT is a registered Danfoss trademark
Function
Figure 1-2. Control Terminals Electrical Diagram