Rockwell Automation SB3000 AC Power Modules - Manual (Page 39)

Diagnostics and Troubleshooting 4-1
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HAPTER
4
Diagnostics and Troubleshooting
This chapter describes the equipment needed to check the operation of the SB3000
Power Module and the tests to be performed. Also included are descriptions of the
SB3000 Power Module faults monitored by the Distributed Power System software.
Procedures are provided for replacing fuses and sub-assemblies.
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, then look at the
built-in DC bus voltage meter. When the voltage is down to approximately
zero (0) volts, open the cabinet doors and check the voltage across the
DC bus bars, 1247 A,B,C (+ bus) and 1145 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.