Frequently asked questions

FA236678

07 October 2021

Issue: 
Connecting ATV61/ATV71 on a motor with PTC Probe.

Product Line:  
ATV61, ATV71

Environment: 
All

Cause: 
PTC Probe connected but not working.

Resolution:
LI6 is a discrete input with which you can switch between two modes: PTC probe and 24V DC.  In this case, the switch "SW2" has to be adjusted to "PTC" .
Thermal monitoring via PTC probes is provided on ATV61 drives by specific inputs. Common characteristics of these inputs:

• Nominal value < 1.5 kohms.
• This corresponds to a maximum of 6 probes (250 ohms at 20°C) or to two sets of 3 (sometimes prewired in the motors).
• Trip resistance: 3 kohms. Reset value: 1.8 kohms. Short-circuit protection < 50 ohms

Location of the inputs:
  - Input LI6 on the terminal block, wire the PTC probes between terminals LI6 and 0V.  This input is seen as a PTC Input if switch SW2 at top of Control Terminal Card is set to PTC.

Note: The parameter Overload Fault Mgmt MUST be set to something other than NO. You need to set it to freewheel.