Detailed explanation of matters needing attention and methods for UPS battery pack replacement

Tags: Uninterruptible power supply UPS battery packs are generally replaced as a complete set, because technically it is not recommended to use new and old batteries together. Its replacement is to use the reverse blocking characteristics of diodes to artificially make voltage between the new and old battery packs (BT, BT') When the new battery BT' is put in and the old battery pack BT is withdrawn, the diode acts as an electronic switch to supply power to the DC bus instantaneously, thus avoiding the circulation of the new and old battery packs during the parallel connection process due to the difference in voltage and ensuring the DC power supply The stability. At the same time, it also avoids the factors that may cause unreliability of the DC system due to interruption of the DC bus power supply box and no battery pack power supply during the replacement of the UPS battery pack. I will explain the replacement method in detail below: 1. Stop the operation of charger 2#U, and remove the fuse FU connected in series in the UPS battery pack BT’. 2. Connect the diode V (2CZ 200A/800V) in parallel at points A and C at both ends of the fuse FU5. 3. After checking the wiring, send it to the battery fuse FU. 4. Remove the fuse FU5, connect the diode V to the circuit, and connect to SA3. Check that the cathode pair of the diode—WOM voltage is about 241V, the anode pair—WOM voltage is about 218V, and the diode is reversely cut off. The DC bus is powered by charger 1#U and battery packs BT and BT’ in parallel, but because the voltage of battery pack BT’ is low, the DC load is powered by charger 1#U and battery pack BT. 5. Disconnect SA1 and remove the fuses FU3 and FU4. The battery pack BT' instantaneously supplies power to the DC bus through the diode V. 6. Start the charger 2#U and adjust its voltage to the rated value. The DC bus is powered by the charger 2#U and the battery pack BT’ in parallel. 7. Remove the old battery pack BT from the battery screen, and connect the connection number of the nearby DC screen, and connect its positive and negative leads to the positive and negative electrodes of charger 1#U respectively. 8. Start the charger 1#U and make it parallel to the assembled old battery and the voltage is 241V. 9. Disable the charger 2#U, and the voltage of the battery pack BT’ drops to about 235V for a short time. 10. Combine SA1, charger 1#U, the old battery pack BT, and the new battery pack G B'are connected in parallel to supply power to the DC bus, but the voltage of the charger 1#U in parallel with the old battery pack BT is higher than that of the new battery pack BT 'Voltage, so the load current is supplied by the charger 1#U and the old battery pack BT, but because the diode V is reversely cut off, the new battery pack BT' will not be reverse-charged. 11. Disconnect SA3, remove the new battery pack BT’ and install it on the battery screen. 12. Connect the diode V parallel to both ends of the fuse FU5 to both ends of the fuse FU3. 13. Install fuse FU4, charger 1#U, the new and old battery packs are connected in parallel to supply power to the DC bus. Due to the diode V, charger 1#U, the old battery pack only supplies power to the DC bus, not the new battery pack. Recharge. 14. Disconnect SA1, and the new UPS battery pack supplies power to the DC bus through the diode V. 15. Install the fuse FU3, and the diode V is short-circuited. At this time, the diode V has lost its function and should be removed with power. 16. Remove the old battery pack. 17. Combine SA1, charger 1#U and the new battery pack in parallel to supply power to the DC bus.
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