Rockwell Automation 2LW3000 LonWorks Communication Option Module for VTAC 7 Drives - Manual (Page 35)

Installing the LonWorks Module in the Drive 3-21
Important: Read and understand the warning labels on the outside of the drive
before proceeding.
Step 1. Shut Down the Drive
Step 1.1 Disconnect, lock out, and tag all incoming power to the drive.
Step 1.2 Wait five minutes for the DC bus capacitors to discharge.
Step 1.3 Remove the cover by loosening the four cover screws.
Important: Read and understand the warning labels on the inside of the drive before
proceeding.
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 3.10 (15 to 25 HP @ 460 volts) and 3.11
(25 to 60 HP @ 460 volts).
Figure 3.10 – DC Bus Voltage Terminals (15 to 25 HP @ 460 VAC)
Motor Leads
AC Power
Input Leads
DC Bus
Volts
+ V/T2 U/T1 T/L3 S/L2 R/L1 W/T3 –