Illustration 1 | g01275457 |
(1) Heat Sink (2) Upper Mounting Bracket (3) Gate Lead Terminal Blocks (4) Snubber Assemblies (5) Lower Mounting Bracket (6) Clear Shield (7) Output Bus Bar (8) Input Bus Bar |
The Static Switches are mounted at the top front of this cabinet. There are two 3-phase static switch banks in this cabinet. There is a total of six individual static switches.
Bypass Static Switch
The set of three switch assemblies in the top row of static switches relate to utility power phases A, B, and C. The set of three switch assemblies are used for Bypass Mode operation.
When this static switch is operational, the UPS is in Bypass Mode. Therefore, the UPS not voltage regulating or capable of discharge. The bypass static switch functions as the system backup in-case of electronics failure in the UPS. The bypass static switch allows the UPS input line to support the load directly through the equipment.
The Bypass Static Switches receive current from the output of the Input/Output Cabinet. The output of the Input/Output Cabinet is routed to the top of the Static Switch Cabinet and into the input connector of the switch.
Power comes out of the switch. The power bypasses the line inductor and connects to the return power bus bars at the bottom of the cabinet. The power bus bars connect directly to the output side of the Input/Output Cabinet.
Line Static Switch
The set of three switch assemblies in the bottom row of static switches relate to utility power phases A, B, and C. The three switch assemblies are used for Line Mode operation.
The Line Static Switch is in parallel with the bypass static switch and in series with the line inductor. This static switch functions as a fast ON/OFF switch that isolates the UPS line input in discharge modes.
The Line Static Switch receives current from the output of the Input/Output Cabinet. The output of the Input/Output Cabinet is routed into the Power Input connector of the switch.
Power comes out of the switch. The power enters the line inductor. The power exits the line inductor and connects to the power bus bars at the bottom of the cabinet. The power bus bars at the bottom of the cabinet connect directly to the output side of the Input/Output Cabinet and the rest of the system.
Removal
Each Static Switch Assembly is individually removable from the cabinet. Each switch is connected to the back panel of the cabinet by four nuts.
- Perform steps in the Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (Static Switch Cabinet)" in order to de-energize the system and gain access to internal components.
- Disconnect the vertical bus bar that connects the inputs of the bypass static switch (upper) and line static switch (lower) to each other.
- Loosen the eight bolts that connect the vertical bus bar to the input connectors. There are four bolts on each input. Use a 76 mm (3/4 inch) socket.
- Move the vertical bus bar out of the way of the static switch to be removed.
- Remove the five cables that are connected to the output connector of the static switch to be removed.
- Disconnect the eight red and white wires from the wire connectors on each side of the static switch by loosening the cross tip screws that hold the wires to the terminals. The labels on the wires indicate the location for the wire. Verify the labels on the wires.
- Remove the two bolts that hold the front edge of the clear shield to the cabinet.
- Remove the two bolts that connect the upper and lower static switch clear shields together.
Note: Disregard Step 6 if the shields are not present.
- Remove the four nuts hold the static switch bracket to the back panel of the cabinet.
- Remove the static switch assembly from the cabinet.
Installation
- Position the static switch assembly in the cabinet and over the four studs on the back panel of the cabinet. The static switch assembly can be positioned up with either end.
- Attach the static switch assembly to the back panel of the cabinet with four nuts. Use a 229 mm (9/16 inch) socket. Tighten the nuts to 54 N·m (40 lb ft).
- Attach the front edge of the clear shield to the cabinet with two bolts.
- Attach the clear shields of the upper and lower static switches together with two bolts.
Note: Disregard Step 4 if the shields are not present.
- Connect the red and white wires to the wire terminals according the labels on the wires. Refer to Illustration 2.
Illustration 2 | g01275545 |
- Attach the five cables that are connected to the output connector of the installed static switch. Refer to Illustration 3 for cable to bus bar connection hardware.
Illustration 3 | g01275550 |
(10) Nut (11) Belleville Washer (12) Grade 8 Coated Steel Washer (13) Bus Bars (14) Bolt (15) Cable Lug |
- Attach vertical bus bar that connects the inputs of the Bypass Static Switches (upper) and the Line Static Switches (lower) to each other.
- Move the vertical bus bar into position across the inputs of the Bypass Static Switches and the Line Static Switches.
- Attach the eight bolts that connect the vertical bus bar to the input connectors from the right side. four on each input. Refer to Illustration 4 for hardware connections.
Show/hide tableIllustration 4 g01271171
(20) Nut
(21) Belleville Washer
(22) Grade 8 Coated Steel Washer
(23) Bus Bars
(24) Bolt
- Tighten the bus bar to the bus bar connection bolts to 150 N·m (110 lb ft).
- Tighten the cable to bus bar connection bolts to 95 N·m (70 lb ft).