Hello guys,
I'd like to share you the Lithium fire cylinders leak-tightness inspection programme.
Tool Preparation
Insulated gloves, insulated shoes, cabinet door key, 13mm insulated torque socket, Phillips screwdriver, 12mm torque spanner, 15mm ordinary spanner, temperature/pressure control sticker, glue.
Business Impact
If the lithium cabinet is not mounted against a wall, there is no need to depower the lithium cabinet and it will not affect the power backup.
If the lithium cabinet is installed against the wall, then the lithium cabinet needs to be powered down when troubleshooting, and the lithium cabinet cannot be powered up. (Lithium cabinets are checked one by one in a parallel cabinet scenario, operating one does not affect other lithium cabinets for power backup)
Points to note
u The troubleshooting process needs to be carried out on a unit-by-unit basis.
u Insulated gloves and insulated tools are required for the removal and installation of batteries.
u Battery modules must be handled in pairs.
Pre-operation check procedure form:
Operating procedures
Put on insulated gloves and insulated shoes first.
General overview of operating steps.
Lithium cabinet against the wall installation scenario:
1 | Lithium cabinet down power | 5min |
2 | Removal of some battery modules | 30min |
3 | Fire gas tightness check | 15min |
4 | Putting back modules | 40min |
5 | Re-energise | 30min |
Lithium cabinet not mounted against a wall Scenario:
Serial number | Operating items | Estimated time |
1 | Fire protection airtightness check (no need to power down) | 15min |
1.Power down operation before replacement (this step is not required for scenes not against the wall)
Disconnect the battery vac and press and hold the POWER ON/OFF button on the battery control unit for more than 5 seconds to power down the cabinet.
Turn the ready switch on the battery control unit to the not ready state, remove the fixing screw and withdraw the battery control unit by about 10cm
2.Removal of part of the battery module (this step is not necessary for scenarios not against the wall)
Two people work together to remove the 1st, 2nd, 3rd and 4th layer battery modules as shown in the diagram to facilitate subsequent maintenance of the fire gas cylinders.The removed copper rows are placed uniformly to avoid loss and the negative power cable terminals are well insulated with insulation tape.
Removing the battery cabinet interlayer plate Remove the screws securing the plywood on both sides and pull out the plywood outwards
3. Sealing inspection of fire gas cylinders
Remove the rear door of the lithium cabinet and check the front and rear pressure gauge readings. If the pressure is below the corresponding range shown in the table below, there is a gas leak and additional gas is required.
2. Check that the nuts are tightened at the fire detection tube and fire bottle connections.
Close the bottle valve first and turn the screw cap clockwise with a 12mm torque spanner to 6Nm, then open the bottle valve.
3. Replace cylinder pressure gauge and O-ring
Unscrew the pressure gauge shown below counterclockwise and replace with a new gauge and O-ring.
4. Check that the fire detection tube and end pressure gauge connections are tight.
The connection to be checked is the 1/2 nut pictured below, use a 12mm and 15mm spanner to screw the nut in opposite directions to 6Nm.
5. Observe the cylinder pressure gauge to see if it meets the filling pressure requirements, if there is no abnormality then the test is complete, at this point the pressure gauge at the end is underlined with a marker to facilitate subsequent inspection observations.
4. Putting back the battery module (this step is not necessary for scenes not against the wall)
After inserting the new module into the cabinet, first measure the insulation of the positive and negative terminals of the module to the cabinet, no abnormality then connect the battery copper row, after the battery copper row is connected, measure the insulation of the positive and negative terminals of any module to the cabinet again, no abnormality can indicate that there is no short circuit in the battery module, and the next power-up operation can be carried out.
Trial Method：
a) When there is no copper connection between the battery modules：
If the multimeter reading keeps floating until it finally approaches 0V, it can be judged that the insulation withstand voltage is not abnormal.
If the multimeter reading is constant for a certain voltage value, the module can be judged to have abnormal insulation withstand voltage and needs to be replaced.
b) After connection of the copper strip between the battery modules：
Set the multimeter to DC voltage and connect one measuring pen to the positive/negative terminals of any lithium module and the other to the lithium cabinet case.
If the multimeter reading keeps fluctuating until it finally approaches 0V, the insulation withstand voltage is judged to be abnormal; if the multimeter reading is constant at a certain voltage value, the insulation withstand voltage of the module is judged to be abnormal and the next measurement is required.
Measure the voltage of the positive and negative terminals of each battery module to the case one by one. When the voltage of the positive terminal of a module to the case is found to be ≤ 64V and the voltage of the negative terminal to the case is ≥ -64V, the battery module can be judged to have a short circuit to the case and needs to be removed and replaced.
5. Re-powering (no need for this step for scenes not against the wall)
1. Install the Battery Control Unit battery management module back into the cabinet and tighten the screws.
2. Turn the Ready switch to ON.
3. Press and hold the red button of the battery control unit for 2 seconds, wait for the green light to flash fast (10HZ), then you can close the vac.
4. If there are no abnormal alarms, the check is complete.
