Operating Instructions

Front View

		Status	Select	Status Select	To UPS B	AC Source		To UPS A		To Server
			Level			B	A
		Function	Level
R	I +	Function
T	N 2
N	4					Bright	Source selected
	EPO					Dim	Source OK, but not selected
Emergency						Dim	Source OK, but not selected
Power Off						Off	Source not OK		Redundant Switch
						Off	Source not OK

			Note:

Only the Factory Default settings shown below should be used. Check that these are the current settings for your unit.

Additional setting are for future upgrades.

Function	Factory	User Selectable Choices			Description
	Default	LED Bright	LED Dim	LED Off
Source A Sensitivity	Reduced	Normal	Reduced	Low	Sets transfer sensitivity to line
					conditions
Source B Sensitivity	Reduced	Normal	Reduced	Low	Sets transfer sensitivity to line
					conditions
Source Preference	Source A	Source A	Source B	None	Selects the preferred AC source
Source A Xfer Voltage	Medium	Narrow	Medium	Wide	Sets the transfer voltage window
Source B Xfer Voltage	Medium	Narrow	Medium	Wide	Sets the transfer voltage window

Emergency Power Off

The UPS may be switched off by a remotely operated Emergency Power Off (EPO) control. Such a configuration is common in computer rooms and laboratories where, for safety reasons, power to the loads must be disconnected. To connect Redundant Switch and its attached Smart-UPS to your emergency power off system, use the EPO connector. Use a normally-open contact to connect the +24 terminal to the IN terminal. A certified electrician can wire the external blue four-pin female connector to the emergency power off system. If this is done, and the emergency power off system is activated, neither UPS will go on-battery.

Cautions

The EPO interface is a Safety Extra Low Voltage (SELV) circuit and may be connected only to other SELV circuits.

The EPO interface is designed to monitor circuits that have no determined voltage potential. Such closure circuits may be provided by a switch or relay properly isolated from the utility. Connection of the EPO interface to any circuit other than a closure type circuit may cause damage to the Redundant Switch.

Front Panel User Programming

User programmable settings are accessible using controls located on the Redundant Switch front panel.

Function Select LED Indicator

The three green Function Select LEDs indicate which user programmable parameter is selected for status display or modification. Use the left Select button to cycle through the five user configurable items listed above.

Function Status LED Indicator

The green Function Status LED indicates the state of the selected user programmable function. Use the right Select button to cycle among the choices.

AC Source LED Indicator

The green on-line LED indicates the line quality and select status of each source: Bright = source selected; Dim = source okay, not selected; Off = source not okay; 1 second flashing of 1 LED, other LED off = both AC sources are out of tolerance.

Source Sensitivity and Transfer Voltage

Source sensitivity and transfer voltage can be changed using the front panel to adjust for power quality. However, only the factory default settings shown above should be used.

7	990-0253A, Revision 2 6/99

SU042-1 3000 VA, SU42-2 3000 VA, SU041 1400 VA, SU043 1400 VA specifications

The APC SU042-1, SU043, SU041, and SU42-2 are reliable uninterruptible power supply (UPS) systems designed to provide consistent power protection for essential electronic equipment. This range of UPS models is ideal for homes, small offices, and critical servers, ensuring peace of mind through a reliable power backup solution.

The APC SU042-1 is a high-capacity 3000 VA model that combines robust performance with smart technologies. It is equipped with a pure sine wave output, ensuring that sensitive electronics, such as servers and networking equipment, receive clean and stable power. With a compact design, this UPS easily fits into various environments while providing extended runtime options through additional battery packs. The LCD display offers real-time information on battery status, load, and input/output voltage, allowing for quick monitoring and management.

In the mid-range category, the APC SU043 and SU041 models stand out with their 1400 VA capacity. These units are perfect for desktop setups and small servers, offering essential features to protect equipment from power disturbances. Both models feature automatic voltage regulation (AVR), which stabilizes incoming voltage and minimizes the risk of damage from power surges. They also come with multiple output sockets, accommodating a variety of devices while ensuring maximum efficiency.

The SU42-2, another 3000 VA model, provides a higher capacity for businesses looking to safeguard critical infrastructure. Similar to the SU042-1, this unit boasts pure sine wave output and advanced LCD displays for monitoring. Additionally, the SU42-2 features customizable settings that allow users to tailor performance based on specific power needs, such as setting alarms and adjusting sensitivity to voltage fluctuations.

All four models utilize advanced battery management systems to enhance battery life and performance. User-friendly, they come with USB and serial connectivity options, allowing seamless integration with network monitoring software, enabling administrators to manage and monitor power status remotely. In conclusion, the APC SU042-1, SU043, SU041, and SU42-2 UPS models represent a versatile range of solutions designed to protect vital equipment against power disturbances, making them an essential investment for anyone reliant on a steady power supply.