Description
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| Illustration 1 | g01284926 |
(1) Location of the DC Bus Disconnect Switch | |
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| Illustration 2 | g01285021 |
(2) DC Bus Input (3) DC Bus Switch Extension Bar (4) DC Bus Ground (5) Clear Plastic Shield (6) DC Bus Disconnect Switch | |
The DC Bus Disconnect Switch (DCSW) (6) is located behind the middle metal safety panel on the rear panel of the cabinet for the flywheel. Via the handle on the front door of unit, the DCSW performs the following operations:
- switches on the DC power
- switches off the DC power
Three cables enter the top of the cabinet for the flywheel. Two of the cables connect to the top of the switch (6) and one of the cables connect to the ground stud (4) for the DC Bus. The cables carry DC voltage from the DC Output for the Inverter Cabinet, via the DC Bus wireway.
Two lights are located on the front of the middle safety panel. The lights indicate whether the DCSW is safe to operate.
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| Illustration 3 | g01284997 |
Wire Connections for the DC Bus Disconnect Switch | |
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| Illustration 4 | g01450817 |
DCSW Hardware connections (10) Nut (11) Belleville Washer (12) Grade 8 Coated Steel Washer (13) Bus Bars (14) Bolt (15) Cable Lug | |
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| Illustration 5 | g01285000 |
DCSW Hardware Connections (20) Nut (21) Belleville Washer (22) Grade 8 Coated Steel Washer (23) Bus Bars (24) Bolt (25) Cable Lug | |
Removal Procedure
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Internal Component Preremoval Steps (Flywheel Cabinet)" in order to shut down the system and gain access to internal components.
- Remove the upper right metal shield and move the hinged APC panel out of the way.
- Place the DCSW handle in the OPEN position.
- Disconnect the wire harness to the 3 DC Disconnect indicators located to the right of the handle.
- Remove the metal shield located in the middle that the DCSW (6) handle is attached to.
- Remove the Field Coil Driver Assembly from the cabinet.
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Field Coil Driver" in order to remove the assembly from the cabinet.
- Remove the fan assemblies.
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Fans (Controls Cabinet)" in order to remove the assembly from the cabinet.
- Remove the clear plastic shield (5) that covers the DCSW (6) input cable connections.
- Remove the two cables from the bottom of the DCSW (6) .
- Remove the auxiliary contact status indicator that is located on the bottom left side of the DCSW (6) .
- Remove the DC Bus Switch extension bar (3) .
- Remove the four bolts that hold the DCSW (6) to the rear panel.
Installation Procedure
- Install the DCSW (6) to the rear panel with the four bolts.
- Install the DC Bus Switch extension bar (3) to the switch by inserting the DC Bus Switch extension bar through the bracket on the upper left panel and into the switch (6) .
- Install the auxiliary contact status indicator that is located on the bottom left side of the DCSW.
- Connect the 2 DC Bus (+) output cables and the Diode Bridge (+) wire to the bottom of the DCSW at contact 2. Refer to Illustration 5.
- Attach the 2 DC Bus (-) output cables and the Diode Bridge (-) wire to the top of the DCSW at contact 5. Refer to Illustration 5.
- Attach the DC Bus (-) input cable to the top of the DCSW at contact 3. Refer to Illustration 4.
- Attach the DC Bus (+) input cable to the top of the DCSW at contact 1. Refer to Illustration 4.
- Tighten the cable nuts to recommended specifications.
- Install the clear plastic shield (5) that covers the DCSW input cable landings.
- Install the fan assemblies.
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Fans (Controls Cabinet)" in order to install the assembly in the cabinet.
- Install the Field Coil Driver Assembly in the cabinet.
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Field Coil Driver" in order to install the assembly in the cabinet.
- Verify the orientation of DCSW handle on the middle metal shield in the OFF position.
- Install the middle metal shield with the handle inserted over the DC Bus Switch Extension Bar (3) and secure the middle metal shield in place.
- Connect the wire harness to the 3 DC Disconnect indicators to the right of the handle.
- Close and secure the top swing out panel and the upper right metal shield.