Rockwell Automation GV3000/SE V.6 Regulator Board 0-56921-6xx, 413338-6BU, 0-56940-6xx, 814.61.00 User Manual
Page 50
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Installing Regulator Board P/N 413338-6BU in 25 to 50 HP @ 460 VAC Drives
7-3
Step 2.
Verify That the DC Bus Capacitors are Discharged
Step 2.1. Using a voltmeter, verify that there is no voltage at the drive’s AC input
power terminals (1L1, 1L2, 1L3).
Step 2.2. Remove the two screws from the top of the hinged panel on which the
keypad bracket is mounted. Tilt the mounting panel forward out of the drive
chassis.
Step 2.3. Ensure that the DC bus capacitors are discharged. To check
DC bus potential:
a. Stand on a non-conductive surface and wear insulated gloves.
b. Use a voltmeter to measure the DC bus potential at the diode bridge as
shown in figure 7.2.
Figure 7.2 – DC Bus Voltage Terminals (25 to 50 HP @ 460 VAC Drives)
(+)
(–)
DC Bus
Measuring
Points
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