Rockwell Automation LiquiFlo 1.0 and 1.5 External Bus Resistor Kit (500/640 Amp) User Manual
Page 3
Instruction Manual D2-3536
3
Step 1: Verifying the DC Bus
Capacitors are Discharged
!
ATTENTION: DC Bus capacitors retain hazardous voltages
after input power has been disconnected. After disconnecting
input power, wait five (5) minutes for the DC bus capacitors to
discharge and then check the voltage with a voltmeter to ensure
that the DC bus capacitors are discharged before touching any
internal components. Failure to observe this precaution could
result in severe bodily injury or loss of life.
Task
Description
Turn off and lock out input power. Wait five minutes
Verify that there is no voltage at the drive’s input power terminals
Remove front cover
Measure the DC bus potential with a voltmeter while standing on a non-conductive surface
and wearing insulated gloves (1000V)
A
B
C
D
D
Test Points for initial
DC Bus Voltage
Measurement
Pos
(+)
Neg
(-)
Checking DC Bus Voltage on LiquiFlo 1.0 Drives (M/N’s 50LXXX, 64LXXXX)
Checking DC Bus Voltage on LiquiFlo 1.5 Drives (M/N’s LF150XXXX)
D
Pos
(+)
Neg
(-)
Test Points for initial
DC Bus Voltage
Measurement