Rockwell Automation 2LW3000 LonWorks Communication Option Module for VTAC 7 Drives - Manual (Page 22)

3-8 LonWorks Module for VTAC 7 Drives
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 shown in figure 3.3.
Step 3. Remove the Keypad Bracket from the Drive
Step 3.1 Record connections to the Regulator board terminal strip if they must be
disconnected to remove the keypad bracket.
Step 3.2 Loosen the thumb screw on the left side of the keypad bracket. Hold the
bracket on the left and lift the bracket up and to the left to separate it from
the keypad support bracket.
Important: The keypad support bracket is connected to the drive by wiring. Do not lift
the bracket out completely, because this can damage or pull out wiring.
Tie up or support the bracket to prevent damage to the wiring.
Step 3.3 Spread the retaining clips on the 26-conductor Regulator board ribbon cable
connector to disconnect it from the Current Feedback board. The Current
Feedback board is located on the right below the keypad.
Figure 3.3 – DC Bus Voltage Terminals (7.5 to 10 HP @ 460 VAC)
W/T3 V/T2 U/T1
+
S/L2 10V 10 COM
Motor Leads
AC Power
Input Leads
DC Bus
Volts
R/L1 T/L3
– + –