Now it's possible to select UPS capacity without being restricted by inrush current!

Fire risk! Issues with power outage countermeasures for ventilation systems become clear

Company N is a materials manufacturer that handles various steel materials and cast steel products. As part of strengthening its business continuity plan (BCP), the company recently conducted a disaster prevention simulation for its own factory, and discovered a problem with the blower system for its melting furnace. Manager U of Company N's Production Equipment Department said the following:

"The melting furnace operates 24 hours a day, 365 days a year, and the temperature is constantly controlled by the air blowing system. We have an emergency power supply so that we can continue to control the temperature even in the event of a power outage, but we found that the approximately five-minute time lag that occurs between the time the power outage occurs and the time it takes to switch to the emergency power supply was a problem. If the air blowing system stopped for even five minutes while the furnace was still hot, the furnace could be damaged, and in the worst case scenario, it could lead to an accident such as a fire."

If you select a UPS based on "inrush current", the UPS may be over-specified...

Mr. U decided to urgently install a UPS and asked a company he knew to help him select a model. However, the proposal he received was far more expensive than he had expected.

▼Inrush current waveform

"We thought that there would be no problem if we selected a UPS based on the rated capacity of the ventilation system, but the inrush current(*) of the ventilation system can be five times the rated value, so we needed to select a UPS based on that peak. The output capacity was far beyond our expectations. With a UPS with a large output capacity, both the introduction and operating costs became much higher than we had anticipated." (Mr. U)
(*) When powering up an electrical device, a large current that temporarily flows in excess of the rated current value at the initial stage.
For more information Basic knowledge and countermeasures for power outages: Power supply problems caused by inrush currents and harmonics

Parallel Processing allows selection based on the rated output capacity regardless of inrush current.

Mr. U, who was having trouble selecting a UPS, stopped by SANYO DENKI CO., LTD. booth at an exhibition and asked for advice on his issues.
After hearing Mr. U's detailed explanation, the SANYO DENKI CO., LTD. representative proposed the SANUPS E33A, Parallel Processing UPS with an output capacity of 100kVA. Mr. U was very interested in this proposal.

"Parallel Processing has a high overload tolerance of 800% for 0.5 seconds, and can fully withstand inrush currents, so there is no need to match the rated output capacity of the UPS to the inrush current," says U.

Achieves high power supply quality and a high conversion efficiency of 98% while saving power consumption

What also attracted Mr. U was the high power supply quality and high conversion efficiency of Parallel Processing.
"Parallel Processing is a power supply method in which the commercial power source and bidirectional Inverter are connected in parallel. Under normal circumstances, the bidirectional Inverter compensates for the commercial power supply while supplying power, and in the event of a power outage, it supplies power without any interruption, achieving high power supply quality and a high conversion efficiency of 98%.
Because the melting furnace is constantly running, the annual cost varies greatly depending on the conversion efficiency of the UPS. With SANYO DENKI CO., LTD. 's Parallel Processing, we can obtain high-quality power while saving on power consumption. This not only ensures safety, but also greatly reduces costs. We felt that we had found exactly what we were looking for." (Mr. U)

* Calculated at 15 yen (tax included) per kWh (estimated value as of April 2023)
*The unit price for extra-high voltage varies depending on the contract, so please check the contract details.

We were also able to resolve issues regarding the implementation and operating costs and the space required to install the equipment.
"We found that by lowering the output capacity, we could significantly reduce initial costs such as transportation and construction costs. We were able to get by with about half the output capacity of the model proposed by the other company, which also reduced the installation space required, and this was well received within the company." (Mr. U)

After an internal meeting, Company N decided to officially adopt SANYO DENKI CO., LTD. 's Parallel Processing UPS, SANUPS E33A.
"Parallel Processing UPS proposed this time was both environmentally friendly and cost-effective. Thanks to this, we were able to successfully complete the power outage countermeasures for the ventilation system. We are grateful for the proposal that fully took into account our requests." (Mr. U)

For more information about Parallel Processing, please also see" Parallel Processing UPS".

release date: 2019-03-01 00:00