Haas Vector Drive 20HP Troubleshooting Manual page 6

Vector Drive - Troubleshooting Guide - CHC
Regen Load
Corrective Action:
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.
Page 6 of 9 pages