205 If You Have An Extended Power Outage; 206 Shutting Down The Unity/I Ups - Unity I UT3K Manuel D'utilisation

205 If You Have an Extended Power Outage

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If a power outage lasts a long time, the UNITY/I continues to provide power for your equipment until it reaches the end
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of its runtime. You can check how much runtime remains by pressing the [
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number of minutes before the end of the runtime (factory default is two minutes), the UPS sounds a "Low Runtime"
alarm (A-00). When the UPS gives this alarm, do an orderly shutdown of your equipment. However, do not shut off the
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UPS. The UPS will shut itself down, but it will leave its microprocessor on. As soon as normal AC line power returns,
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the UPS will automatically restart itself (unless you have set parameter 03 to disable the auto restart feature) and begin
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recharging its batteries. If you know that the power outage will be long (for example, a day or longer), you may wish to
shut down the UPS. See Section 206.

206 Shutting Down the UNITY/I UPS

Usually, you do not need to shut down the UPS, even if your equipment will be shut down for several days. There may
be times, however, when you want to shut down the UPS, such as when you will not be using the UPS for an extended
period of time, when the UPS is being serviced, or before you move the UPS. Best Power does not recommend
shutting down the UNITY/I on a daily basis. To shut down the unit, follow the instructions below.
Note: While the UPS is shut off, recharge the batteries every 90 to 120 days. You can do this by restarting the UPS for
24 hours.
1. If your UNITY/I does not have an external bypass switch, switch off the protected equipment.
If your UNITY/I has a "Break Before Make" external bypass switch (the words above the UPS BYPASS
SWITCH read, in this order, "LINE" "OFF" "UPS"), turn off the protected equipment. Then, turn the UPS BYPASS
SWITCH to "LINE." Switch the protected equipment back on.
Before switching an external make-before-break (MBB) bypass switch to the LINE position, the BYPASS light on
the UPS front panel must be lit. If you operate an external MBB bypass switch while the UPS is operating on line
power or on battery power, equipment damage may result. Refer to Best Power publication "TIP 410" for proper
bypass switch operating instructions.
If your UNITY/I has a "Make Before Break" external bypass switch (the words above the UPS BYPASS
SWITCH read, in this order, "LINE" "UPS" "OFF"): Turn the UPS BYPASS SWITCH to "LINE."
2. Turn the keyswitch inside the unit's front door to "Off."
3. If your UPS does not have an external bypass switch, disconnect the UPS by shutting off its circuit breaker or by
unplugging the UPS. Shutting off the circuit breaker is preferred, but if other pieces of equipment are connected to
the same breaker, you may want to leave the breaker on and unplug the UPS.
If your UPS has an external bypass switch, turn the UPS AC LINE DISCONNECT SWITCH to "OFF."
4. If you have an external battery pack, push in the main DC switch on the front of the cabinet.
5. When you are ready to restart the UPS, follow the entire startup procedure in Section 100.
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CAUTION
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] key on the front panel. At a set