Press [POWER OFF]. If the vector drive voltage indicator light is on, do not touch the electrical components. The high voltage in the control cabinet can kill you. Wait for the voltage indicator LED on the vector drive to go off completely.
Disconnect the REGEN load leads from the vector drive at terminals 1 and 2. Measure the resistance across the leads. The reading must be as follows:
- 2-resistor box: between 9.5 and 12.5 ohms.
- 3-resistor box: between 6.3 and 8.3 ohms ohms. (As shown in the illustration.)
- 4-resistor box: between 4.6 and 6.6 ohms.
If the REGEN loads are within specification, there can be a problem with the vector drive. Measure the resistance across terminals 1 and 3 on the vector drive.
Note: A good drive will read a high resistance across 1 and 3 (somewhere in the Kilo ohm range). A short circuit indicates a faulty vector drive.