Rockwell Automation GV3000/SE AC Drive ControlNet Network Communication Board, M/N 2CN3000 - Manual (Page 39)

Installation 2-27
Step 2. Verify that the DC Bus Capacitors are Discharged
Step 2.1 Use a voltmeter to verify that there is no voltage at the drive’s AC input
power terminals (1L1, 1L2, 1L3).
Step 2.2 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. 50 to 100 HP @ 460 V only: Use a voltmeter to measure the DC bus
potential at the diode bridge. Refer to figure 2.13.
c. 100 to 150 HP @ 460 V only: Take care not to touch any conductive
traces. Use a voltmeter to 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. Refer to figure 2.14.
Step 3. Remove the Keypad Bracket from the Drive
Step 3.1 Loosen the two screws from the top of the hinged panel (where the keypad
bracket is mounted). Tilt the mounting panel forward out of the drive
chassis.
Step 3.2 Record connections to the Regulator board terminal strip if they must be
disconnected to remove the keypad bracket.
Step 3.3 Spread the retaining clips on the Regulator board’s 60-conductor ribbon
cable connector to disconnect it from the Power Module Interface board.
This ribbon cable runs from the top of the Regulator board through a slot in
the mounting panel to the Power board on the other side. Slip the ribbon
cable out of the slot to free it from the mounting panel.
Figure 2.13 – 50 to 100 HP Drive Components and Locations
Keypad
Regulator
Board
Power Module
Interface Board
DC Bus
Measuring Points
+
–