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| Illustration 1 | g01337065 |
Maintenance Bypass Circuit Breaker Left Panel Components (1) Maintenance Bypass Circuit Breaker Controller Board (2) Maintenance Bypass Circuit Breaker Power Supply Board (MPS) (3) Time Delay Relay | |
The Maintenance Bypass Controller Board is linked to the K5 Output Circuit Breaker in the System Input/Output Cabinet. The operation of K5 may be coordinated with the operation of the Maintenance Bypass Circuit Breaker. The Maintenance Bypass Controller Board is a stand-alone machine controller for the Maintenance Bypass Cabinet.
All status conditions and needed conditions are inputs to the Maintenance Bypass Controller Board. So, all needed conditions are monitored for a safe and controlled transfer to and from Maintenance Bypass. The Maintenance Bypass Controller Board controls the Maintenance Bypass Circuit Breaker and the K5 breaker in the proper sequence in order to guarantee an overlapped transfer with no interruption to or interruption from Maintenance Bypass for service of the Series 1200 UPS.
Multidrop Bus
The Maintenance Bypass Controller Board provides serial data over the Series 1200 Multidrop Bus. The Maintenance Bypass Controller Board functions as a slave on this bus, receiving commands from the APC-2 and responding with status information.
The Maintenance Bypass Controller Board has a 100-Ohm Terminating Resistor for the Multidrop bus that is selectable by the use of a jumper. Jumper JMP9 provides terminal resistance. There is also a switch that sets the Node ID. Set the Maintenance Bypass Controller Board Node ID and Terminating Resistor jumper to the settings on the following table:
| Maintenance Bypass Controller Board Multidrop Settings | |
|---|---|
| Node ID | 6 |
| Terminating Resistor | JMP9 - Installed if no 4-Wire option present and Maintenance Bypass Cabinet present |
Refer to Systems Operation, Testing and Adjusting, RENR7654, "Multidrop Network - Setup" for information on setting up the Multidrop Network.
Fuses
The fuses are indicated in Table 2 below. Visually inspect the fuses. Replace the fuse if the fuse is blown.
| Maintenance Bypass Controller Board Fuses | ||
|---|---|---|
| Fuse | Amperes | Protects |
| Maintenance Bypass Controller Board - F2 | 5A Time Lag | Output Breaker (K5) Motor Operator |
| Maintenance Bypass Controller Board - F3 | 5A Time Lag | OK to transfer From Maintenance Bypass Lamp |
| Maintenance Bypass Controller Board - F4 | 5A Time Lag | Unused |
| Maintenance Bypass Controller Board - F5 | 5A Time Lag | OK to transfer from Maintenance Bypass Lamp |
| Maintenance Bypass Controller Board - F6 | 5A Time Lag | Unused |
| Maintenance Bypass Controller Board - F7 | 5A Time Lag | Maintenance Bypass Breaker Close Coil |
| Maintenance Bypass Controller Board - F8 | 5A Time Lag | Output Breaker (K5) Close Coil |
| Maintenance Bypass Controller Board - F9 | 5A Fast | Maintenance Bypass Shunt Trip |
| Maintenance Bypass Controller Board - F10 | 5A Fast | Output Breaker (K5) Shunt Trip |
| Maintenance Bypass Controller Board - F11 | 5A Time Lag | Maintenance Bypass Breaker Motor Operator |
LED Indicators
The LEDs on the Maintenance Bypass Controller Board indicate the status of the Maintenance Bypass Controller Board depending on the state of the system. The following tables show the LED indicators and the LED indicators states.
| Maintenance Bypass Circuit Breaker LED Indicators D1 - D5 | ||||
|---|---|---|---|---|
| LED | Transfer TO Maintenance Bypass NO BREAK | Transfer TO Maintenance Bypass WITH BREAK | Transfer FROM Maintenance Bypass NO BREAK | Transfer FROM Maintenance Bypass WITH BREAK |
| D1 | Maintenance Bypass Breaker closing | Output Breaker (K5) opening | Output Breaker (K5) closing | Maintenance Bypass Breaker opening |
| D2 | One (1) Second overlap: Maintenance Bypass Circuit Breaker and K5 closed | One (1) second break delay: Maintenance Bypass Circuit Breaker and K5 opened | One (1) second overlap: Maintenance Bypass Circuit Breaker and K5 closed | One (1) second break delay: Maintenance Bypass Circuit Breaker and K5 opened |
| D3 | Output Breaker (K5) opening | Maintenance Bypass Breaker closing | Maintenance Bypass Breaker opening | Output Breaker (K5) closing |
| D4 | To Maintenance Bypass sequence failure | To Maintenance Bypass sequence failure | From Maintenance Bypass sequence failure | From Maintenance Bypass sequence failure |
| D5 | Maintenance Bypass Controller Board datalock to APC | Maintenance Bypass Controller Board datalock to APC | Maintenance Bypass Controller Board datalock to APC | Maintenance Bypass Controller Board datalock to APC |
| Maintenance Bypass Circuit Breaker LED Indicators D24- D29 | |
|---|---|
| LED | Purpose |
| D24 | Lit when OK to Transfer FROM Maintenance Bypass |
| D26 | Lit when OK to transfer TO Maintenance Bypass |
| D28 | Maintenance Bypass Circuit Breaker Close Command |
| D29 | K5 Close Command |
Maintenance Bypass Controller Board Diagram
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| Illustration 2 | g01273553 |
Maintenance Bypass Control Board (5) Multidrop "J1" (6) Terminating Resistor "JMP1" (7) Node ID "SW1" | |
Removal
| NOTICE |
|---|
Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in the static-shield bag. Follow these guidelines when you handle any module: Touch a grounded object to discharge static potential. Wear an approved wrist-strap grounding device. Do not touch the bus connector or connector pins. Do not touch circuit components inside the module. If available, use a static-safe work station. |
- Perform steps in the Systems Operation, Testing and Adjusting, "Internal Component Preremoval Steps (Maintenance Bypass Cabinet)" in order to de-energize the system and gain access to internal components.
- Disconnect all connectors from the board. The connectors locations in the unit are labeled. Verify each connector to make sure that the label is present and legible.
Refer to Illustration 2.
- Unscrew the cross tip screw from the lower left corner of the Board.
- Disconnect the seven white plastic stand-offs connecting the board to the left panel using the following method.
Note: The board must be removed from the stand-offs without bending the board.
- Pinch the head of each stand-off so that the board is not locked to the stand-off but is still attached to the stand-off.
- Remove the board by gently and evenly pulling the board from all stand-offs at the same time.
Installation
| NOTICE |
|---|
Electrostatic discharge can damage integrated circuits or semiconductors if you touch bus connector pins. When not in use, keep the module in the static-shield bag. Follow these guidelines when you handle any module: Touch a grounded object to discharge static potential. Wear an approved wrist-strap grounding device. Do not touch the bus connector or connector pins. Do not touch circuit components inside the module. If available, use a static-safe work station. |
- Position the board in the cabinet over the seven white stand-offs that are connected to the left panel.
- Push the board, gently and evenly, onto all the stand-offs simultaneously. Make sure all stand-offs are locked in place.
- Insert the cross tip screw in the lower left corner of the board and screw the cross tip screw into the left panel.
- Plug the wire connectors into the correct connectors on the board. Check the labels on each connector for proper placement.
Refer to Illustration 2.