Precautions while using Power Supply
Precautions for Safe Use for that Product Do not touch the Product while power is being supplie.
41. Precautions to be taken before powering the circuit
When connecting the power supply and load to the experimental board, the sequence of the connection to be made is from the load to the power supply, which helps to avoid any floating wire or connector to be charged or shorted to each other. Never let connection wires connected to the power supply or the out put port of the experimental board to be floating.
42. Precautions while switching ON the circuit
Apply low voltages or low power to check proper functionality of circuits.
Once functionality is proven, increase voltages or power, stopping at frequent levels to check for proper functioning of circuit or for any components is hot or for any electrical noise that can affect the circuits operation.
43. Precautions while switching off or shutting down the circuit
Reduce the voltage or power slowly till it comes to zero.Switch of all the power supplies and remove the power supply connections.Let the load be connected at the output for some time, so that it helps to discharge capacitor or inductor if any, completely.
44. Precautions while modifying the circuit
Switch off the circuit as per the steps in section 3.5.Modify the connections as per your requirement.Again check the circuit as per steps in section 3.3, and switch ON as per steps in section 3.4.
45. Startup and Maintenance Precautions
Do not touch the terminals while power is on.Doing so could cause electric shock or erroneous operation.Switch all phases of the external power supply off when cleaning the module or retightening the terminal or module mounting screws.Not doing so could result in electric shock or erroneous operation.Do not charge, disassemble, heat, place in fire, short circuit, or solder the battery. Mishandling of battery can cause overheating or cracks which could result in injury and fires.
46. Power precautions
Make sure that the power source circuits are properly grounded, then use the power cord supplied with the device to connect it to the power source.If the installation requires a different power cord than the one supplied with the device, make sure you use a power cord displaying the mark of the safety agency that defines the regulations for power cords in your country. The mark is your assurance that the power cord can be used safely with the device.
47. Ac power supply
Use the following procedures for installing AC power supplies in the ServerIron device.
To install an AC power supply, do the following
1. If necessary, remove the power supply locking screw located in the center rear of the device illustrated below .
2. If the empty power supply bay has a cover plate, press inward on the two latches near the left and right edges of the cover plate to unlock the plate illustrated below , then remove the plate. Remove the new power supply from its packaging.
3. With one hand, hold the bar on the front panel of the power supply. With the other hand, support the underside of the power supply, and insert the power supply into the empty power supply slot. Press until the supply is completely in the slot, so that the connectors on the back of the supply fully engage with the pins on the power backplane.
4. Press the two latches near the edges of the supply outward to lock the supply in place.
5. Replace the power supply locking screw.
6. Install the power cord.
1. If necessary, remove the power supply locking screw located in the center rear of the device illustrated below .
2. If the empty power supply bay has a cover plate, press inward on the two latches near the left and right edges of the cover plate to unlock the plate illustrated below , then remove the plate. Remove the new power supply from its packaging.
3. With one hand, hold the bar on the front panel of the power supply. With the other hand, support the underside of the power supply, and insert the power supply into the empty power supply slot. Press until the supply is completely in the slot, so that the connectors on the back of the supply fully engage with the pins on the power backplane.
4. Press the two latches near the edges of the supply outward to lock the supply in place.
5. Replace the power supply locking screw.
6. Install the power cord.
48. Prepare the Work Area
The surface should be non conductive and non static. When building a system it is important to avoid static electricity, which can damage sensitive electronic components such as those used in a computer. To avoid static build up the person building the system should use a static reducing device such as an antistatic wrist strap. This is normally placed around the wrist and has a lead that attaches to a special plug or is connected to a known earth.
49. Esd precautions
Electrostatic discharge ESD is generated by two objects with different
electrical charges coming into contact with each other. An electrical
discharge is created to neutralize this difference, which can damage
electronic components and printed circuit boards. Use a grounded wrist
strap designed to prevent static discharge.
50. Testing and Tidying
It is important once you have finished a task to ensure that the result meets the intended purpose and that no unwanted side effects have arisen. For example, if you have installed a sound card you should test that it is fully functional all functions such as midi, joystick, line in, speaker and microphone and that the installation has not affected any other components. It is possible that the installation of a sound card could affect other devices such as an internal modem.
The tests to be carried out will depend on the task carried out. For example, if you are building a complete computer system from scratch then the tests will be quite extensive and cover all the features and components of the system. Other tasks, such as upgrading the memory, will require less testing and be less likely to affect other components. Testing is covered in more detail in later sections when dealing with particular devices, for example printers.
The final part of carrying out a practical task is to tidy the work area and consider any health and safety risks. The workplace should be left tidy and clean, ready for future use. All tools should be returned to their proper location toolbox, cupboard, etc. and old components should be removed and disposed of, if appropriate.
Note This tidying only applies to the technicians own equipment and waste. A technician should never tidy or reorganise a customers work area to please themselves.
The tests to be carried out will depend on the task carried out. For example, if you are building a complete computer system from scratch then the tests will be quite extensive and cover all the features and components of the system. Other tasks, such as upgrading the memory, will require less testing and be less likely to affect other components. Testing is covered in more detail in later sections when dealing with particular devices, for example printers.
The final part of carrying out a practical task is to tidy the work area and consider any health and safety risks. The workplace should be left tidy and clean, ready for future use. All tools should be returned to their proper location toolbox, cupboard, etc. and old components should be removed and disposed of, if appropriate.
Note This tidying only applies to the technicians own equipment and waste. A technician should never tidy or reorganise a customers work area to please themselves.
