Rockwell Automation SB3000 High Pwr SB3000 AC Pwr Modules (RCS) - Manual (Page 35)

Diagnostics and Troubleshooting 4-1
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Diagnostics and Troubleshooting
This chapter describes the equipment needed to check the operation of the SB3000
Power Module and the tests to be performed. Included are descriptions of the SB3000
Power Module faults and warnings monitored by the Distributed Power System
software. Procedures are also provided for replacing Power Module cabinets,
sub-assemblies, and fuses.
4.1 Required Test Equipment
The following equipment is required when servicing the SB3000 Power Module:
• an oscilloscope with an impedance of at least 8 megohms
• a 10:1 probe
• an isolated voltmeter (1000V DC)
• a clamp-on ammeter (1500A)
Note that all measuring devices-meters-oscilloscopes that are AC line-powered must
be connected to the AC line through an ungrounded isolation transformer.
!
ATTENTION: DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power, wait ten
(10) minutes for the DC bus capacitors to discharge. Open the cabinet
doors and check the voltage across the DC bus bars, 347 A,B,C (+ bus)
and 345 A,B,C (- bus), with an external voltmeter to ensure 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.
ATTENTION: The SB3000 Power Module contains printed circuit boards
that are static sensitive. Do not touch any components, connectors, or
leads. Failure to observe this precaution could result in damage to
equipment.