Rockwell Automation GV3000/SE V.6 Regulator Board 0-56921-6xx, 413338-6BU, 0-56940-6xx, 814.61.00 - Manual (Page 57)

8-4 GV3000/SE Drive Version 6 Regulator Board Installation Instructions
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. Loosen the two screws from the top of the hinged mounting 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. 60 to 100 HP Drives: Use a voltmeter to measure the DC bus potential at
the diode bridge as shown in figure 8.3.
c. 100 to 150 HP Drives: Do not touch any conductive traces. Measure the
DC bus potential at the bottom of the fuse holders on the Power Module
Interface Board on the back of the Regulator panel, shown in figure 8.4.
Figure 8.3 – DC Bus Voltage Terminals (60 to 100 HP @ 460 VAC Drives)
47 45
DC Bus
Measuring Points
(+)
IL1 IL2 IL3 U V W
(–)