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BackUPS

FAILSAFE UPS POWER SWITCH

DESCRIPTIONRead this manual thoroughly before installation or use.

BackUPS is a power controller for ensuring reliable AC power to critical equipment that is powered with an Uninterruptible

Power Supply (UPS). BackUPS constantly monitors the output of the UPS, and automatically bypasses the UPS if its

output fails or becomes unstable. This keeps the load powered-up, and allows the UPS to be disconnected for battery

replacement or other maintenance. BackUPS provides a Status output for remote monitoring, and can Bypass the UPS

via a remote GPI input. BackUPS can also be used as a “Remote Reboot” device, to remotely reset equipment.

THEORY OF OPERATION

BackUPS has two AC inputs: LINE and UPS. Line is connected to a local AC socket. The UPS input is also connected

to this socket, and the UPS output is connected to the UPS input on the BackUPS unit. Whenever the UPS is operating,

its output is sent to the LOAD via the duplex outlet on the BackUPS. If the UPS output fails, BackUPS will instantly bypass

the UPS, and route direct-LINE power to the load.

Whenever the UPS powers-up, the DELAY TIMER is activated. BackUPS monitors the UPS during the Delay Time

interval, which is set via DIP switches. If UPS power is stable during this interval the UPS will be enabled, supplying

power to the LOAD. Any interruption during or after the Delay will cause the unit to instantly bypass the UPS.

INSTALLATION

BackUPS is supplied with two power cables. Plug the longer cable into a local AC outlet, and plug other end into the IEC

connector labeled INPUT FROM LINE. Plug the shorter cable into the output of the UPS, and plug the other end into the

IEC connector labeled INPUT FROM UPS. Connect the UPS input to the local AC outlet. The load should be plugged

into the duplex outlet on the back of the BackUPS unit.

SETUP

The DELAY TIME DIP switches are used to set the Delay Time and optional modes, as follows:

Switches 1 thru 7 set the Delay Time. See the chart on the top cover, and set one switch down to select the time desired.

There are two Delay Time ranges: HI and LO. Set Switch 8 to select either range: UP=HI, DOWN=LO.

To completely disable the delay timer, set Switch 9 down. (Leave this switch UP for initial installation.)

To enable the Fast Reset mode, set Switch 10 down. (Leave this switch UP for initial installation.)

OPERATION

BackUPS has three modes of operation, set by the MODE switch:

DEL: In Delay mode, BackUPS instantly switches to LINE power if the UPS fails or becomes unstable. When the UPS

powers-up, the Delay Timer monitors its output. If the UPS output is stable during the Delay interval, the UPS will be

switched back online after the Delay interval times-out.

AUT:In Automatic mode, BackUPS instantly switches to LINE power if the UPS fails. When the UPS powers-up,

BackUPS instantly switches back to UPS power. There is no Delay Timer function (even if DIP switch #9 is up).

BYP: In Bypass mode, BackUPS bypasses the UPS at all times, sending LINE power to the LOAD. Select this mode to

remove the UPS for battery replacement or other maintenance.

LEDs provide visual confirmation of BackUPS operation, as follows:

The RED LEDs indicate presence of AC power at the two inputs and at the duplex output socket.

The GREEN LED indicates when the UPS is active and is supplying power to the load. If the green LED is off, the UPS is

bypassed and the load is being powered via the LINE input.

The BLUE LED shows the status of the Delay Timer: If it’s flashing, the timer is operating. When the timer has “timed-out”,

the blue LED will be solid-on. If the Timer is disabled (switch #9 down), the blue LED will be off.

To check/restart the timer: Unplug the INPUT FROM UPS, wait about one second, then plug it back in. The BLUE LED

will flash during the Delay interval. Another way to restart the timer is to momentarily set Switch #9 down, then back up.

Note that the timer will function only if the UPS output is on. (Red UPS LED must be on.)

HENRY ENGINEERING

PO Box 3796

Seal Beach, CA 90740

Tel: 562.493.3589

www.henryeng.com

TM

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