How to setup a PTC alarm without tripping the ATV61 drive?


29 September 2021

PTC alarm installation

Product Line:
ATV61, altivar 61, ATV71, Altivar 71

All models, all serial numbers

Using PTC probes, they can only get an indication when the drive goes into fault.  They would like warning alarm before the fault condition

The only way to have just a warning: Alarm Group 1 and R2 ON, is to assign:

1.8 Fault Management
  PTC Management
      LI6=PTC Probe [PTCL] = Always

  Motor Thermal Prot
      Overload Fault Mgt [OLL] = Ignore

1.5 Inputs/Outputs CFG
  R2 Configuration
      R2 Assignment [R2] = Alarm Grp1

  Alarm Grp1 Definition
      LI6=PTC Alarm [PLA] = ON

!!   However, the side effect of: Overload Fault Mgt [OLL] = Ignore is, that motor thermal protection by calculating the I2t will not trip the drive.  The drive will not have overload protection.