Test Purpose

This test will verify if the Molex inputs which are used to connect hall or encoder sensors are functioning properly.


Note:This test is applicable only to encoder and Hall inputs mapped to the Molex port. Other types of encoder inputs (for example, encoder inputs on PMSM drives or Channel 3 encoder inputs on DC drives) should be tested as general-purpose inputs.


Test Process

To perform the test, follow the next steps: 


Case 1: Hall sensors on Molex Inputs


  • Use a wire and connect sequentially each Hall input of all motor channels to ground
  • Ensure that the Hall Input state is changing from high to low, by monitoring it through the diagnostics tab.
  • If the input state changes, then the input is functional




Case 2: Encoder Sensors on Molex Inputs 


Because Molex Encoder inputs cannot be directly monitored through the diagnostics tab, it is advised to perform a firmware update and convert the drive from a ACIM or DC model to a PMSM model. The equivalent models that be converted with a firmware upgrade are listed below:  



 

Product

Brushless

AC Induction

Brushed

SBLG23xx(S)

SBLG2360T(S)

SIMG2360T(S)

SDCG3260T

SBLMG23xx

SBLMG2360T

SIMMG2360T(S)

SDCMG3260T

FBLG23xx(E)(S)

FBLG2360T(E)(S)

FIMG2360T(E)(S)

FDCG3260T(E)

GBLG23xx(E)(S)

GBLG2360T(E)(S)

GIMG2360T(E)(S)

GDCG3660T(E)



Notice:Ensure that you are using the appropriate firmware version when performing the update. If an incompatible firmware version is used, the motor drive may crash.


After performing the firmware update, the Encoder inputs can be tested as if they where Hall inputs. The figure below illustrates how to make the test: 


  • Use a wire and connect sequentially each Hall input of all motor channels to ground
  • Ensure that the Hall Input state is changing from high to low, by monitoring it through the diagnostics tab.
  • If the input state changes, then the input is functional



Test Explanation


Molex encoder and Hall inputs are designed to support sensors with open-collector outputs and therefore incorporate internal pull-up resistors. As a result, when an input is left floating, the motor drive reports a high state. When the sensor's open-collector output pulls the Molex input to ground, the motor drive reports a low state.


The cable used for this test connects the open-collector input to ground to change its state and verify correct operation.