Rockwell Automation 2LW3000 LonWorks Communication Option Module for VTAC 7 Drives - Manual (Page 30)

3-16 LonWorks Module for VTAC 7 Drives
Step 1. Shut Down the Drive
Step 1.1Disconnect, 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 Open the drive’s outer cabinet door.
Step 1.1 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 or U/T1, V/T2, W/T3).
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 shown in figure 3.7.
Figure 3.7 – DC Bus Voltage Terminals (30 to 100 HP @ 230 VAC and 75 to 200 HP @ 460 VAC)
GND
V (T2)
U (T1)
W (T3)
R S T
DC Bus
Volts
P (+)
N (-)