EMC 4K VA 20K VA UPS System configuration, Efficiency Optimizer function, Free Run Mode

Filter	PFC&Booster	Inverter	By-pass	Filter
			switch
Charger &				Monitoring
Battery	Battery	Control		panel
switch
		&		RS232 or
				USB
		Monitoring
				Slot

Fig.1. Block diagram

Efficiency Optimizer function

The Efficiency Optimizer function is a new feature for the UPS adding cost effectiveness, minimizing power loss and reducing power consumption. Alternating between bypass and on-line modes is achieved automatically and in accordance with the conditions of the utility power. On-line mode may be used during times of intermittent power supply, and bypass mode when power flows smoothly in order to obtain greatest efficiency. Irregularities can be detected in less than a second, and on-line mode reactivated immediately. Switching back to online mode occurs when input voltage is outside ±10% or nominal (±15% selectable), when input frequency is outside of ±3Hz or when no input line is available.

Although high efficiency is standard, the default operation is in on-line mode. Bypass can be activated in the LCD panel, though on-line can be run permanently if preferred.

Free Run Mode

The UPS operates in free run mode when input frequency is outside of the selected input frequency range. Free run mode is when output frequency does not match input frequency. When starting the UPS, the frequency regulation detected is 50 or 60 Hz ±0.25Hz. Please refer to chapter 7.2 if you want bypass available while running in free run mode.

Diagnostic tests

When you start the UPS, a diagnostic test is automatically executed that checks electronics, battery, and reports any problems on the LCD display.

An advanced battery management system always monitors the conditions of the batteries sends any forewarnings if replacement is needed. Otherwise every 30 days of normal mode operation, a battery discharge test is performed and any problems reported on the LCD display.

Except during the first 24 hours after startup while the UPS is in charging mode (please see chapter 7.2), diagnostic tests can be performed manually from the front panel at any time.

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2.2 System configuration

The UPS device and the internal backup battery make up the system. Depending on the site and load requirements of the installation, certain additional options are available as a tailored solution.

Planning a UPS system, the following should be taken into consideration:

zThe total demand of the protected system shall dictate the output power rating (VA). Allow a margin for future expansion or calculation inaccuracies from measuring power requirements.

zBackup time needed will indicate the battery size needed. If load is less than the UPS nominal power rating then actual backup time is longer.

zThe following options are available:

zExternal Battery Cabinets

zTransformer cabinets

zMaintenance bypass switches

zConnectivity options (relay card, SNMP/WEB card)

The following UPS models are available

Model	Backup time	Recharge time to 90% capacity
	Internal batteries
UPS 4000VA	4min	4 hours
UPS 5000VA	4min	4 hours
UPS 6000VA	7min	4 hours
UPS 8000VA	4min	4 hours
UPS 10000VA	4min	4 hours
UPS 12000VA	8min	4 hours
UPS 15000VA	6min	4 hours
UPS 20000VA	4min	4 hours

Additional External Battery Cabinets are available if more back-up time is needed.

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