In the event of power disturbances such as unexpected power outages or momentary voltage drops, the system continues supplying power for a certain period of time, protecting critical equipment and data from failure or loss.

Features

• High-frequency PWM control using IGBT inverters enables instantaneous response to rapidly fluctuating loads, supplying safe and highly efficient power.
• Commercial power synchronized operation allows seamless transfer to the commercial power supply circuit during overloads or failures, ensuring uninterrupted power supply to the load.
• Supports various battery types and cell counts for DC 100V input systems
  (e.g., 54-cell lead-acid batteries, 86-cell alkaline batteries, and others).
• Compatible with systems equipped with DC 100V direct current loads.
• Complies with the Japan Sewage Works Agency specifications
  (“General Specifications for Electrical Equipment Constru ction”).

Installation Conditions

Series		VNS Series
Rated output		1kVA	3kVA	5kVA	7.5kVA	10kVA	15kVA	20kVA
Operating method		Continuous inverter supply system
Control method		PWM control method
Cooling method		Natural cooling		Forced air cooling
AC Input	Number of phases	Single-phase or three-phase
	Rated voltage	100V, 200V, 400V
	Rated frequency	50Hz or 60Hz
DC Input	Rated voltage	120V　(for MSE-type lead-acid battery, 54-cell configuration)
	Voltage range	90V～140V
AC Output	Number of phases	Single-phase, two-wire system
	Rated voltage	100V or 105V
	Adjustment range	Within ±5%
	Voltage accuracy	Within ±2%
	Rated frequency	50Hz or 60Hz
	Frequency accuracy	Within ±0.1% (asynchronous operation)
	Frequency synchronization range	Within ±1Hz
	Rated load power factor	Lagging 0.8 (0.7–0.9)
	Voltage waveform distortion	5% or less (linear load)
	Instantaneous voltage fluctuation	±10% or less (load change 0% ⇔ 100%)
	Settling time	Within 100ms (load change 0% ⇔ 100%)
	Inverter efficiency	80% or higher
	Transfer time	No interruption (synchronized operation)
	Auto retransfer (auto bypass)	Bypass transfer at 110% (r.m.s) or higher (synchronized)
		Inverter transfer at 102% (r.m.s) or lower (synchronized)
	Overload capacity	120% for 5 minutes 150% for 10 seconds (asynchronous operation)

Specifications

Ambient temperature	0–40°C
Relative humidity	30–90%
Noise level	65 dB or less (A-weighted) for 1–7.5kVA 75 dB or less (A-weighted) for 10–20kVA
Installation environment	Locations free from dust and corrosive gases
Paint color	Munsell 5Y7/1, semi-gloss　※Color can be changed upon request.
DC load connection	DC 100V connection available

DC Side

Lead-Acid Batteries MSE, MSJ, UP	Number of cells	54 cells
	Float voltage	120V（MSE,MSJ,UP)
	End-of-discharge voltage	90V
Alkaline storage battery AHH-P	Number of cells	86 cells
	Float voltage	123V（AMH-PE）
	Equalizing voltage	140V（AMH-PE）
	End-of-discharge voltage	90V

Applicable Standards

• Japanese Industrial Standards (JIS)
• Electrotechnical Committee Standards (JEC)
• Japan Electrical Manufacturers’ Association Standards (JEM)
• Storage Battery Association Standards (SBA)
• Other specifications for water and sewage facilities are supported as required.

Battery capacity is selected according to the presence of DC loads and the required backup time.
Design customization is available to meet installation conditions and on-site requirements.