Rockwell Automation GV3000/SE V.6 Regulator Board 0-56921-6xx, 413338-6BU, 0-56940-6xx, 814.61.00 - Manual (Page 42)

Installing Regulator Board P/N 0-56921-6xx in 15 to 25 HP and 25 to 60 HP @460 VAC Drives 6-3
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 (R/L1, S/L2, T/L3).
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. Use a voltmeter to measure the DC bus potential at the DC bus power
terminals as shown in figures 6.3 (15 to 25 HP) and 6.4 (25 to 60 HP).
Figure 6.2 – Regulator Board Location in 25 to 60 HP @ 460 VAC Drives
Option Board
Regulator Board
Front View
Top View
Figure 6.3 – DC Bus Voltage Terminals (15 to 25 HP @ 460 VAC Drives)
Motor Leads
AC Power
Input Leads
DC Bus
Volts
+ V/T2 U/T1 T/L3 S/L2 R/L1 W/T3 –