Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 300)

6-10 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” Frame
Metal-oxide varistors (MOV) are part of the Transient Suppression
Network located within the connection cabinet. The PWMR drive
contains one varistor panel while the 18-pulse drive contains three.
1. Ensure there is no power to the equipment.
A T T E N T I O N A T T E N T I O N To prevent electrical shock, ensure the main
power has been disconnected before working
on the transient suppression network. Verify
that all circuits are voltage free using a hot stick
or appropriate voltage-measuring device.
Failure to do so may result in injury or death.
2. Observe the locations of the connecting links.
3. Detach the connecting links by removing the screws.
4. Using a screwdriver remove the screws at the base.
5. Replace the MOV (polarity is not an issue).
6. Continue by replacing the screws and connecting links.
I M P O R T A N T I M P O R T A N T Each MOV panel is grounded. Ensure that one
MOV (see Figure 6.7 for location) is connected to
the grounding lead.
PowerFlex 7000 18-pulse, some 6-pulse and some PWM-R drives will
come with a grounding network installed. All other 6-pulse/PWM-R
drives will have a notch filter in place of the grounding network.
The number of capacitors will vary depending on the system voltage.
1. Ensure there is no power to the equipment.
A T T E N T I O N A T T E N T I O N To prevent electrical shock, ensure the main power
has been disconnected before working on the
capacitor. Verify that all circuits are voltage free
using a hot stick or appropriate voltage-measuring
device. Failure to do so may result in injury or
death.
2. Note the position of the leads.
3. Remove the 6.4-mm (¼ inch) hardware and disconnect the leads
connected to the terminals.
4. Four brackets are used to secure the capacitor. Loosen the four
screws at the base of the brackets and lift the capacitor out.
5. Place the new capacitor and tighten the screws securely.
Metal-Oxide Varistor
Replacement
Output Grounding Network
Capacitor Replacement