★ Basic introduction of EA990 series 150-800kVA UPS products

The EA990 series is a high-end UPS power supply with three inputs and three outputs designed with full digital control technology launched by Easystar. The maximum capacity of a single machine can be expanded to 800kVA; the layout design of the whole machine breaks the traditional tower machine design thinking, and completely adopts the advanced modular design concept, which not only ensures the compactness of the layout, but also improves the reliability of the system. This series of products have excellent electrical performance, complete software and hardware protection functions, can adapt to different grid environments, and can provide safe and reliable power protection for various loads. The EA990 series UPS adopts a large-screen touch screen LCD design and a menu-style architecture. Various information of the UPS can be monitored through the LCD, so that all operations are clear at a glance.

★ 2. Working principle of EA990 series 150-800kVA UPS products

EA990 series are online products, using intelligent technology, easy to maintain, easy to expand. It adopts DSP (Digital Signal Processing) intelligent control and high-frequency switching technology to transform the input into a pure, high-quality sine wave output. The principle block diagram is shown in the figure.

Principle block diagram

2.1 Main road mode

UPS Normal working mode, the AC input is rectified by the rectifier, converted from AC to DC, and then reversed by the inverter, converted from DC to AC output. After the two-stage conversion, the output voltage with good accuracy and quality can be obtained, which can prevent the input harmonics, burrs, voltage transients and other interference from affecting the load. The working principle is shown in the figure.

Principle block diagram of main road mode

2.2 Bypass mode

When the UPS detects that the power device is overheated, overloaded, or other faults that will shut down the inverter, it will automatically switch to the bypass. The bypass power supply will directly provide energy to the load. In the bypass mode, the quality of the load power supply is not protected by UPS, and is easily affected by abnormal conditions such as power outages, AC voltage waveforms or abnormal frequencies. The working principle of bypass mode is shown in the figure.

Schematic diagram of bypass mode

2.3 Battery mode

When the AC input of the rectifier is abnormal, the UPS will work in battery mode. At this time, the power device obtains energy from the battery, which is converted into AC by the inverter and then output. The working principle of battery mode is shown in the figure.

Block diagram of battery mode

2.4 Maintenance bypass mode

When the UPS is working in the maintenance bypass mode, the current flows through the maintenance bypass circuit and no longer passes through the main power and bypass modules. At this time, the internal wiring of the cabinet can be maintained. The working principle of the maintenance bypass mode is shown in the figure. Shown.

Principle block diagram of maintenance bypass mode

2.5 ECO mode

ECO (Energy Control Operation) mode is a UPS power saving operation mode, this mode can be set via LCD or WEB interface. In ECO mode, when the bypass source voltage is within the ECO voltage range, the static bypass switch is turned on. At this time, the bypass is powered and the inverter is in the standby state (manual startup is required to ensure that the inverter is in the standby state. Make sure that the energy flow diagram has flowed to the inverter module part). When the bypass source voltage is not within the ECO voltage range, the load will switch from the bypass to the inverter for power supply. Regardless of the bypass or inverter power supply, the rectifier will be in the on state and charge the battery through the charger. This working mode can achieve higher efficiency. The working principle of ECO mode is shown in the figure.

Principle block diagram of ECO mode

★ 3. Features of EA990 series 150-800kVA UPS products

3.1 Very high usability design Comprehensive intelligent design, key components support quick maintenance

Traditional large-scale UPS power supply systems often adopt a one-step construction mode in order to avoid the risk of power outage caused by midway expansion. This not only greatly increases the initial investment in construction, but also causes the power supply system to operate at low efficiency for a long time.

EA990 adopts intelligent design to avoid the disadvantages of traditional UPS system shutdown and capacity expansion, and realize the smooth upgrade and expansion of the system. The construction of the power supply system of the computer room realizes capacity expansion on demand, effectively reducing the initial investment and operating costs of customers.

Average maintenance time is greatly reduced, effectively improving availability

Availability is the probability that the system is in a working or usable state when it starts a task. It is generally related to MTBF (Mean Time Between Failures) and MTTR (Mean Time Between Failures), that is, the greater the MTBF, the higher the system availability. , The smaller the MTTR, the higher the system availability.

The fast plug-in design greatly reduces the system's fault repair time and effectively improves the system availability. The trained engineer can replace the faulty module, so that the system can quickly return to normal. The lengthy process of traditional UPS shutdown, analysis, and repair is avoided, and the repair time of the system can be shortened to less than 10 minutes.

3.2 96% ultra-high operating efficiency Maintain high efficiency under low load, the most commonly used load rate segment is the highest efficiency segment

Due to redundant configuration (in order to ensure power supply reliability, UPS systems generally adopt parallel or double bus configuration) and over-configuration (system planning may consider 3-5 years of expansion requirements), the UPS system in traditional data centers has a long-term Operating at a low load rate of 10%-40%, the actual operating efficiency is far lower than the declared efficiency. The power loss caused by UPS can generally reach 6%-10% of the power loss of the entire data center.

EA990 maintains high efficiency under low load, ensuring that customer UPS can operate efficiently even in the low load rate range of 20%-40%. 96% high efficiency can be maintained at 40% load rate; 95% high efficiency can be maintained at 20% load rate.

Intelligent sleep design to ensure the efficient operation of the UPS system at extremely low load rates

When the load rate is very low (10%-15%), EA990 can start the smart sleep to make some modules enter the standby state, increase the system load rate to the optimal range, thereby improving the operating efficiency. Even after sleep, the EA990 system will still have at least one module redundancy, and immediately wake up the sleep module when the system load increases to ensure the safety and reliability of the system.

ECO mode efficiency can reach more than 99%, obtaining the ultimate energy saving effect

In areas with better power grids, the ECO function can be enabled to increase the operating efficiency to more than 98% and save energy costs.

In ECO mode, the load is supplied by the bypass by default (the bypass input permission range can be set), and the inverter is in the standby state.

When the mains power is abnormal, EA990 can quickly switch back to the inverter mode to ensure the quality of load power supply.

3.3 Excellent ease of use Small footprint and friendly engineering interface

The power density of a single cabinet can reach up to 800kVA, saving 50% of floor space

Completely front maintenance design, easy to operate

Smart battery management, effectively extending battery life

Intelligent floating charge conversion and temperature compensation

Enable battery sleep to avoid long-term floating charge and shorten battery life

Automatic detection of battery health, warning can be issued before failure

The number of battery cells is adjustable from 30 to 46, which is easy to maintain

Low harmonics and high power factor, effectively reducing the investment in the distribution system

THDi<3% & PF>0.99 reduces harmonic pollution to the grid

Soft start technology can increase the ratio of diesel engine to 1:1.1

3.4 Complete reliability guarantee Perfect redundant design

Redundant design is adopted for energy control unit and communication bus.

The fan adopts a fault-tolerant design, a single fan failure can still carry 50% load, and two fan failures can carry 30% load

Excellent power grid adaptability

Wide voltage input range: 138-485Vac, 305V-485V can support full load, 138-305V linear derating to 40% load

6kV/5kA lightning protection design, effectively reducing the failure rate of lightning strikes

Excellent environmental adaptability

It can work at full load at 40℃, and the charging capacity will not be derated

Reinforced coating of three-proof paint, adapt to harsh environments such as dust and salt spray

★ 4. Technical parameters of EA990 series 150-800kVA UPS products

Type    number	EA99150	EA99200	EA99300			EA99400	EA99500	EA99600		EA99800
Capacity	150kVA	200kVA	300kVA			400kVA	500kVA	600kVA		800kVA
Enter metrics
Enter the number of phases	Three-phase five-wire (3Φ+N+PE)
Enter the rated voltage	380Vac/400Vac/415Vac
Input voltage variable range	138-305Vac: 40% derating,    305-485Vac: no derating
Input frequency variation range	40～70Hz
Input power factor	≥0.99
Input current harmonic content	<3%
Battery voltage	±240 VDC (±180 VDC, ±192 VDC, ±204 VDC, ±216 VDC, ±228 VDC, ±252VDC, ±264VDC, ±276VDC optional)
Number of battery cells	12V 40 knots (at the same time support 30, 32, 34, 36, 38, 42, 44, 46 knots)
Output indicator
Number of output phases	Three-phase five-wire (3Φ+N+PE)
Output rated voltage	380Vac/400Vac/415Vac
Output voltage regulation accuracy	±1%
Output frequency accuracy	Mains mode: Track bypass input in synchronization state; Battery mode: 50Hz/60Hz±0.25%
Output power factor	1
Output waveform distortion degree	≤1% (resistive load); ≤3% (non-linear load)
Output current crest factor	3:1
Inverter overload capacity	Transfer to bypass after 60 minutes at 110% load; transfer to bypass after 10 minutes at 125% load; transfer to bypass after 1 minute at 150% load Bypass; load＞150%, turn to bypass in 0.2 seconds
Bypass overload capacity	Load ≤135%, long time operation; load <1000%, lasting 100ms
System indicators
System efficiency	≥96%
Maximum number of parallel machines	6
Switching time	0ms
Protection function	Output short-circuit protection, output overload protection, over-temperature protection, battery low-voltage protection, output over-voltage protection, input phase loss and phase Sequence protection, fan failure protection, etc.
Communication interface	RS485, dry contact, SNMP card
show    show	7-inch LCD touch screen
Work environment
Operating temperature	0～40℃
Storage temperature	-40℃～70℃ (without battery)
Relative humidity	0%-95% (no condensation)
Altitude	Altitude ≤1000m, over 1000m, derating 1% for every 100m rise
Protection level	IP20
Noise (1 meter away from the device)	<65dB			<68dB		<70dB
Other features
Cabinet size (W×D×H) mm	600×850×2000				1200×850×2000				1400×850×2000	2400×850×2000
Net weight kg	340	360	460			720	790	974		1540