Emergency power is provided to other industrial and civil buildings, when applied to the fire for the fire-powered electrical equipment, power conversion devices. It guarantees the emergency electricity needs, but if the emergency power supply quality, but off, there will be a variety of problems, leading to play its normal function
Emergency power discharge time is not up
Battery performance is the main function of the emergency discharge performance fire emergency power supply. Current standards require emergency discharge time is not less than 90min, and 10 cycles of complete charge and discharge durability test, the last discharge time should not be less than 85% of the initial discharge time. But found that many manufacturers of products discharge time does not meet this requirement in the inspection, rather than the discharge time of less than 90min, it is an endurance test at the end of the first discharge time and discharge time that much difference.
Battery quality problems, the charging circuit power is too small, the discharge termination voltage is too high and other reasons
Battery quality problems, the battery occupy more than half the cost even higher in the whole fire emergency power supply, especially in high-power emergency power, many manufacturers for their own interests more attention in the selection of the battery cells while ignoring the quality of the battery price
Since the emergency power supply for charging the battery charging circuit current is too small, resulting in a predetermined charging time could not be filled with all batteries, especially for the endurance test, recharged, short battery discharge time discharge phenomenon is more pronounced.
Some emergency power charging circuit power is too small, the charging current can not be transferred to the appropriate state, should consider replacing or re-designed to meet the requirements of the relevant circuit.
May also be a battery discharge termination voltage is too high, the battery discharge prematurely are protected, failed to fully release the battery power to terminate the discharge led to the discharge time is too short.
Series battery voltage is too high
EPS emergency power supply in use, due to the different needs, and sometimes used the battery should be connected in series, the series generated voltage battery problem is EPS emergency power supply common.
When the series battery rated voltage is greater than or equal to 12V, respond battery (group) segment protection, each battery (group) should not exceed the rated voltage of 12V, and when the battery (s) charged, each battery (group ) voltage should be not less than the rated voltage.
Now most fire emergency power in the battery pack segment protection only be done on each cell voltage detection, alarm prompted when a battery voltage is too low or too high, but failed to do so when the battery pack in series in a timely manner to protect the battery when a section or a short circuit somewhere cell line. Once the battery pack somewhere so short or a section inside the battery plates short circuit, particularly prone to large spark could cause a fire, the battery explosion, the consequences could be disastrous, so manufacturers should pay attention to protection of the battery.
Resistance to environmental temperature and humidity changes poor
EPS fire emergency power supply wanted to fire electrical equipment, power conversion devices, will appear when applied to a fire occurred in the process of using the different problems, such as excessive surface temperatures inside the power supply device, the power supply emergency discharge time is not up, a fault display confusion, the control section 'crash', emergency dysfunction or loss and other phenomena.
Environmental testing is mainly to test the power supply's ability to adapt to the surrounding environment, but also an important criterion to measure the power quality performance. So manufacturers in the design and manufacture of power when dealing with the environmental impact of the power unit to give full consideration, including housing materials, components, selection and structure design of the battery and the like. For to temperature and humidity changes sensitive components have protective measures.
Cable between the charger and the battery does not meet the requirements
Fire emergency power applications in total there are often wired connection between the charger and the battery does not meet the requirements. Manufacturers generally between fire emergency power charger and the battery has a protection switch, protection switch off, it sends an alarm signal when the emergency power supply fault detection voltage is less than the battery pack. But some products to protect the cable between the switch and disconnect the battery pack somewhere in operation, but not a fault alarm and this time some of the display parameters indicating normal battery.
If the connection line between the charger and the battery open circuit fault is not reported, there will be serious problems in engineering use. Short circuit should be able to continue 24h, inside the power supply during surface temperature should not exceed 90 ℃, reconnect the battery (group), the emergency power supply should be able to work properly. If the charger short circuit protection using improper short circuit inside the power supply temperature is too high or the power supply itself damage related components easily lead to power can not work properly.