APC SU041 1400 VA, SU043 1400 VA Operating Instructions, Front View, Emergency Power Off

Operating Instructions

Front View

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