Rockwell Automation SA3100 Power Module Interface (PMI) Regulator - Manual (Page 69)

Circuit Board Replacement Guidelines 7-1
C
HAPTER
7
Circuit Board Replacement
Guidelines
Always perform the following steps when replacing Regulator circuit boards or
performing any other work on the drive:
Step 1. Turn off and lock out all incoming power.
Step 2. Wait five minutes to allow the DC bus voltage to dissipate.
Step 3. Open the drive cabinet and/or remove the drive’s cover as required to access
the drive.
Step 4. Measure the DC bus potential with a voltmeter before working on the drive.
Measure the voltage across the DC+ and DC- terminals (DC brake terminals)
on Power Module terminal block TB1 (see figure 7.1 for location). When the
DC bus potential is down to less than 5 volts, touch a 50 ohm, 50 W or larger
resistor across the test points for twenty seconds to allow any remaining DC
bus voltage to dissipate.
Remove the resistor and re-measure the DC bus potential. It should now
be 0V.
Note that circuit boards are exposed when they are out of the drive. Wear a ground
strap and handle the boards by their edges only. When not in use, circuit boards
should be stored in anti-static bags.
!
ATTENTION:Only qualified personnel familiar with the construction and
operation of this equipment and the hazards involved should install,
adjust, operate, or service this equipment. Read and understand this
manual and other applicable manuals in their entirety before proceeding.
Failure to observe this precaution could result in severe bodily injury or
loss of life.
ATTENTION:DC bus capacitors retain hazardous voltages after input
power has been disconnected. After disconnecting input power wait five
(5) minutes and check the voltage of the DC bus 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 circuit boards of the PMI Regulator contain static-
sensitive components. Do not touch the circuit boards or their connectors
without proper ESD handling equipment. When not installed, circuit
boards should be stored in anti-static bags. Failure to observe this
precaution could result in damage to, or destruction of, the equipment.