Understanding UPS (Uninterruptible Power Supply) Systems

What Is a UPS?

A UPS (Uninterruptible Power Supply) is a device that immediately provides backup power during power outages, momentary power interruptions, or unstable voltage conditions. It allows equipment to continue operating without interruption or provides operators with sufficient time to safely shut down the equipment.

Key Specifications to Consider When Choosing a UPS
When selecting a UPS, you should pay close attention to the following specifications:

1.Waveform:
The output waveform must be “Pure Sine Wave”. The use of Simulated Sine Wave or Square Wave UPS units is strictly prohibited, as they may cause abnormal noise, overheating, or even damage to the equipment.

2.Operating Mode:
We recommend choosing "On-Line" models. This architecture features zero transfer time during a power outage and provides the most stable voltage to your equipment.

3.Rated Capacity:
The rated capacity should be 3–6 times the maximum power consumption (input power) of the equipment. This is necessary because the instantaneous current during motor startup is significantly higher, requiring a sufficient power buffer to prevent overload.

Safety Precautions for Use

1.Dedicated Use:
If a UPS is required for a suction machine/aspirator, it is recommended that the UPS be connected only to that single device and essential medical equipment. Do not connect other electrical appliances at the same time, as sudden overload may cause the UPS to shut down.

2.Regular Testing:
The battery inside a UPS is a consumable component. It is recommended to perform a plug-unplug test once a month. If the battery has degraded, it should be replaced as soon as possible (typical battery life is about 2–3 years).

Example: Selecting a UPS for the DF-750 Suction Machine
To help you better understand how to choose a suitable UPS, take our DF-750 suction machine (aspirator) as an example:

The DF-750 is rated at 220V and 0.18A ± 0.05A, so its maximum power consumption (input power) is approximately 50W.

Although the DF-750 normally consumes only about 50W, the instantaneous current during motor startup is much higher, potentially reaching 200W–300W. Therefore, it is recommended to select a 1000VA (approximately 800W) UPS to ensure sufficient power buffer.
Note: Maximum power consumption (input power) = Maximum current × Voltage.

Additional Recommendation

Why 1000VA?
Currently, most "Pure Sine Wave" and "On-Line" UPS models on the market start at a minimum specification of 1000VA; 500VA models with a pure sine wave are rare.

We recommend the 1000VA specification to ensure you can easily find a model with the correct "Waveform" while guaranteeing that the motor startup will never cause the UPS to overload and trip.