Turning On Procedures for a Single Machine
This section is suitable to a single running UPS machine and not proper to parallel ones. When all the connections have been done on the UPS, please follow the procedures below to start the UPS:
1. When it is decided that each phase has a voltage, close the rectification input switches to start the UPS rectifier. If LCD panel does not light after the rectification input switch is closed, the rectifier will not be started. This indicates that the input lines are wrong in their input line orders. Now turn off the rectification input switch and general input power, and carefully examine the input lines. When the input lines (R, S, and T) line phases are correctly connected, restart the total input power and rectification input switches. When LCD panel is light, it means that the input lines are in correct orders. Wait for 20 seconds for self-testing; the inverter will be started normally.
2. Only when UPS inverter is started normally, close the battery switch.
3. Close the bypass input switch
4. Close output switch
Warning:
When the UPS works normally, the maintenance switch can never be closed; otherwise the UPS will be damaged.
Turning Off Procedure for a Single Machine
1. First turn off all the output load switches of the UPS;
2. Turn off the bypass input switches of the UPS
3. Turn off the battery switches of the UPS
4. Turn off the rectification input switches of the UPS
5. Turn off the general input switches of the UPS
Warning:
1. Please strictly follow the above operation orders.
2. All the above procedures must be completed continuously until all the Switches are turned off.
Turning On Procedures for a Paralleling UPS System
This section is suitable only to parallel UPS running and not proper to single machine UPS.
When all the lines are connected, please check all the lines are correctly connected and then strictly follow the procedures below to start and operate the UPS parallel running system:
1. When input voltage is tested to be available on each phase, close the rectification input switch and start the rectifier of the UPS power supply. If LCD board does not light up after the rectification input switch is turned on, it means that the rectifier has not been started, i.e. the input phases is wrongly connected. At this moment, please turn off the general input power and rectification input switch and exchange the two phases at any order. When order of the input lines (R, S, and T) is decided, close the general switch and rectification input switch again to observe if the LCD board works. When input phase order is connected correctly, the inverter will be started normally after 20 seconds of self-testing.
2. Close the battery switch after the inverter is started normally.
3. Follow the above steps 1 and 2 to start and operate another UPS or other UPS that are needed to be connected for parallel operation.
4. When it is confirmed that each UPS has been started normally, test the output voltage of each set UPS. If the output voltage is normal, close all the bypass input switches.
5. The output voltages (R, S and T) of three phases are measured again with a multimeter, and confirm that output voltage of each set UPS is normal.
6. The output voltage difference between each phase and another is measured with a multimeter and all the output phase voltage difference (UR-R, US-S, and UT-T) between all the UPS that are connected in parallel should not be over 10 V. If the voltage difference is less than 10 V, it indicates that each set of UPS is synchronic with another UPS. Now each set of UPS can be operated in parallel; otherwise its operation is prohibited and the reasons for being synchronic should be investigated.
7. Close the output switch. After several minutes, close the general load switch.
Warnings:
1. When each UPS is not synchronic, the UPS in parallel operation is strictly prohibited.
2. When a UPS works normally, it is prohibited to close the maintenance switch; otherwise the UPS can be damaged.
3. When a UPS is in the status of operations in parallel, it is strictly prohibited that input rectification switch, battery switch, bypass switch, and output load switch cannot be turned off on one set or many sets of he UPS.
Turning Off Procedures for a Paralleling UPS System
1. First of all, turn off output load switch of each UPS running in parallel.
2. Turn off bypass input switch of each UPS running in parallel.
3. Turn off battery switch of each UPS running in parallel.
4. Turn off rectification input switch of each UPS running in parallel.
5. Turn off the general power switch.
Warnings:
1. The above order of the operation steps must be strictly followed.
2. Each of the above steps must be completed continuously until all the switches are turned off.
Turn Off Procedure in Emergency for a Paralleling UPS System
When an unexpected malfunction happens, follow the steps below to turn off the UPS running in parallel:
1. Turn off the general load switch.
2. Turn off output load switch of each UPS running in parallel.
3. Turn off bypass switch of each UPS running in parallel.
4. Turn off the general input power switch of each UPS running in parallel.
5. Turn off the battery switch of each UPS running in parallel.
Warning: the order of operation procedures above must strictly be followed. Operations for a Working UPS to Be Connected to Another UPS on Line Note: This section is suitable only to the UPS running in parallel.
1. Test the rectification switch, battery switch, bypass switch, output switch of each set of UPS already in operation and guarantee that they are all closed.
2. Close the rectification input switch to make the rectifier of the UPS to work normally.
3. Close battery switch
4. Close bypass switch
5. Wait for about 5 minutes and measure the R-R phase, S-S phase and T-T phase voltage differences between the output voltage of the UPS and electric supply voltage and the voltage difference should be less than 30 V (mean square root).
6. First of all, one terminal of the parallel interconnected line of the UPS is to be connected to the parallel interconnected socket on the UPS case that is just started. The other terminal of the parallel interconnected line is firmly connected to the parallel interconnected socket on the UPS rack that has been already in running status. In connecting process, it should be done smoothly and should be done successfully in one trial to avoid any repeated twisting.
7. When it is confirmed that the inter-UPS line is firmly connected to two sets of UPS, measure the R-R phase, S- S phase, and T-T phase output voltage differences between two sets of UPS. If one set of UPS is running with load, the voltage difference should be less than 20V; if each set of UPS is running without load, the voltage difference should be less than 5V.
8. Close the output load switch of the UPS newly started.
Remark: If one new UPS is to be connected into a group of UPS that have already been running in parallel, the procedures to start the new UPS are the same as the above.
Warnings:
1. The order of the above operation steps must strictly be followed.
2. It is strictly prohibited to run the UPS in parallel under the condition that the inter-UPS connection line and inter-UPS terminal have not be firmly connected.
Operations for Turning Off a Malfunction UPS in the Combined Machine Working Status.
Note: This section is suitable only to the UPS running in parallel.
1. It is confirmed that all the bypass switches of each UPS are in the close status.
2. Turn off the output load switch of the malfunction UPS.
3. Plug out the inter-UPS connection line of the malfunction UPS from the socket.
4. Turn off the bypass switch, rectification switch, and battery switch of the malfunction UPS.
Warnings:
1. The order of the above operation steps must be strictly followed.
2. It is strictly prohibited to turn off the inter-UPS connection line when the parallel UPS is in normal working status.
3. It is strictly prohibited to connect the UPS power for interconnection under the condition that the inter-UPS connection line of the UPS to be run in parallel has not completely firmly been connected.
4. When electric supply input is available or when the battery is running under discharging condition, it is strictly prohibited that the battery switch of the UPS is to be turned off, if one set of UPS, which is interconnected for running, sends out a under-voltage warning due to too low discharging voltage of the battery.
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