Rockwell Automation 20Y PowerFlex 700H, 700S, and 700AFE Drive Fan Systems, Frames 9...14 - Manual (Page 263)

Rockwell Automation Publication PFLEX-IN029B-EN-P - August 2014 263
PowerFlex 700H and 700S Diagnostic Procedures Appendix A
Checking the Fan Inverter
Fuses Two fuses are included in the circuit that provides DC bus power to the fan
inverter circuit boards. See the diagrams on pages
258 and 259 for details. See the
chapter in this manual that applies to your drive frame size for the fuse locations.
Using an ohmmeter or a voltmeter to check the fan inverter fuses.
Checking Fuse Integrity with no Power Applied
• Remove the fuse from the fuse holder and use an ohmmeter to verify that
each fuse reads less than 1
Ω across the metal ferrule ends. If a higher
reading is measured, replace both fuses.
Checking Fuse Integrity with Power Applied
• Using a voltmeter, measure the DC bus voltage across the fuse pair (top
and bottom) to be the same voltage OR measure across the body of each
fuse to have no voltage drop. If a voltage drop exists across the fuse body,
replace both fuses.
IMPORTANT This procedure requires special equipment and training. Only qualified and
trained personnel should perform these procedures.
ATTENTION: Potentially fatal voltages may result from improper usage of a
multimeter and other test equipment. If a multimeter is used to measure high
voltage waveforms, use appropriately rated probes and highest appropriate
voltage scale.
DC Bus Vout
DC Bus Vout
No Volt Drop No Volt Drop