ABB ACS 501 Installation & Start-Up Manual page 59

Chapter 6 – Service and Maintenance
6-4
Note: Terminal Block X50 disconnects from the Control Interface Card in
three whole sections. To do this, lift the interlocking tabs along the top
edge of the three X50 sections and carefully pry the sections straight
outward from the Control Interface Card. Mark the sections to
correspond with their order of assembly on the Control Interface Card.
4. Remove the screws fastening the left side of the Control Interface Card
to the ACS 501 chassis, disconnect the cable from X4 on the Motor
Control Card, and swing the Control Interface Card open to access the
Motor Control Card.
5. Remove all wires from the rectifier terminals.
6. Set your multimeter to test diodes. If your multimeter does not have a
diode test function, refer to the Resistance Test following this Diode
Test.
7. Connect the multimeter negative test probe to the rectifier positive
terminal and measure each rectifier phase pole with the multimeter
positive test probe. Meter readings should be approximately 0.5.
Figure 6-1 Positive Rectifier Test
0.5 V
100Ω ¾... 10 k Ω
8. Connect the multimeter positive test probe to the rectifier positive
terminal and measure each rectifier phase pole with the multimeter
negative test probe. The meter should register infinity at each rectifier
phase.
ACS 501 Installation & Start-up Manual