Chapter 6 – Service and Maintenance
6-2 ACS 501 Installation & Start-up Manual
ACS 501 – 002, 003,
and 005
Diode Test
1. Disconnect and lock out power from the ACS 501.
WARNING! Wait at least five minutes after disconnecting power from the
drive before you attempt to service the drive. Bus capacitors in the
intermediate circuit must discharge before servicing the drive. Check for zero
volts at Terminals X50:21 – 29 and X2:(+) and (-) or between the input
terminal block X1 and Terminal Block X2:(+) if an internal brake option is
installed. Failure to check voltage may result in death or serious injury.
2. Check for zero volts at Terminals X50:21 – 29 and X2:(+) and (-) or
between the input terminal block X1 and Terminal Block X2:(+) if an
internal brake option is installed.
CAUTION: Electrostatic Discharge (ESD) can damage electronic circuits.
Do not handle any components without following the proper ESD
precautions.
Note: When disconnecting wires from components and terminals, mark the
wires to correspond to their component and terminal connections.
3. Remove all control wiring from the Control Interface Card.
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 the choke wires from Terminals X6, X7, X8, and X9.
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 Terminal X6 and measure
all phase poles U
2
, V
2
, W
2
, of Terminal X1. Meter readings should be
approximately 0.5.
8. Change the multimeter test probe polarity. The meter should register
infinity.
To Next Page
