Danfoss VLT AutomationDrive FC 301 Programming Manual page 11

Introduction
The digital and analog inputs and outputs must be connected separately to the common inputs (terminal 20, 55, 39) of the
frequency converter to avoid ground currents from both groups to affect other groups. For example, switching on the
digital input may disturb the analog input signal.
Input polarity of control terminals
PNP (Source)
Digital input wiring
12 13 18 19 27 29
Illustration 1.3 PNP (Source)
NPN (Sink)
Digital input wiring
12 13 18 19 27 29
Illustration 1.4 NPN (Sink)
NOTICE
Control cables must be screened/armoured.
See section Grounding of Screened Control Cables in the
Design Guide for the correct termination of control cables.
®
VLT AutomationDrive FC 301/302 Programming Guide
32 33 20 37
32 33 20 37
MG33MH02 - Rev. 2013-09-30
Illustration 1.5 Earthing of Screened/Armoured Control Cables
1.6.2 Start/Stop
Terminal 18 = 5-10 Terminal 18 Digital Input [8] Start
Terminal 27 = 5-12 Terminal 27 Digital Input [0] No
operation (Default coast inverse)
Terminal 37 = Safe Torque Off (where available)
12 13 18 19
Start/Stop
Speed
Start/Stop
[18]
Illustration 1.6 Start/Stop
27 29 32 33 20 37
Safe Stop
9
1 1