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S4K2UC SERIES USER MANUAL | 13

1.4.3 Inverter

In normal operation, the S4K2UC’s inverter utilizes the DC output of the PFC rectier to produce precise, regulated sine

wave AC power. When utility power fails, the inverter receives DC power from the DC-DC converter. In either operation

mode, the UPS inverter is online, continuously generating clean, precise, regulated AC output power.

1.4.4 Battery Charger

The battery charger utilizes energy from the utility power and precisely regulates it to continuously oat charge the

batteries. The batteries are being charged whenever the S4K2UC is plugged in, even when the UPS is not turned on.

1.4.5 DC-DC Converter

The DC-DC converter raises the DC voltage from the battery to the optimum operating voltage for the inverter. This

allows the inverter to operate continuously at its optimum eciency and voltage, thus increasing reliability.

1.4.6 Battery

The S4K2UC uses valve-regulated, non-spillable, lead acid batteries. To maintain battery design life, operate the S4K2UC

in an ambient temperature of 0°C to 25°C (32°F to 77°F).

NOTE: Optional external battery cabinets are available to extend battery run times.

1.4.7 Dynamic Bypass

The S4K2UC provides an alternate path for utility power to the connected loads in the unlikely event of a UPS malfunc-

tion. Should the S4K2UC have an overload, overtemperature or UPS failure condition, the UPS automatically transfers the

connected loads to bypass.

NOTE: The bypass power path does not protect the connected loads from disturbances on the utility.

1.5 Operating Modes

The UPS operating modes include: Utility (VAC) Mode, Bypass Mode, Battery Mode, Battery Recharge Mode, and

Frequency Converter Mode. For descriptions of indicators and control buttons, refer to “3.0 Controls & Indicators”.

1.5.1 Utility (VAC) Mode

During Utility (VAC) Mode, utility power provides energy to the S4K2UC. The lters, PFC rectier and the inverter process

this power to provide computer-grade power to connected loads. Meanwhile, the UPS maintains the batteries in a fully

charged state.

1.5.2 Manual Bypass Mode

Manual Bypass Mode occurs when the Standby/Manual Bypass button is pressed and held for about 2 seconds while

the S4K2UC is in Utility (VAC) Mode. Bypass operation is indicated by an audible alarm and illuminated amber bypass

indicator. (If other indicators are illuminated, refer to “8.0 Troubleshooting”). During Manual Bypass Mode, utility power

bypasses the inverter and provides energy to the connected load.

CAUTION

Turning o the UPS in Manual Bypass Mode will result in loss of output power and dropped loads.

Emerson SOLAHD S4KC Series User Manual

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