capacity of the UPS, don’t worry. The next section describes a test that you can perform to determine whether or not your equipment and the UPS are compatible, even if the computed power requirement of your equipment is 50% greater than the capacity of the UPS!
3.6.5Once all power requirement figures have been converted to VA units and added together, simply determine whether the power requirements of your equipment is less than or equal to the capacity of the UPS. If this is not the case, then it must be decided which equipment should be left unprotected by the UPS. See section 3.8 covering overloads.
3.6.6An example of how to determine the power requirements of a computer system is given below.
Example - labels found at system equipment rear panels
230 V~ 1A
230 VAC, 70W
50/60
230 V~ .2A
The power requirements of the example computer, monitor and external tape drive may be calculated as follows:
Computer VA | = | 230 x 1 A | = | 230 VA |
Monitor VA | = | 70 x 1.4 | = | 98 VA |
Tape Drive VA | = | 230 x .2A | = | 46 VA |
|
|
|
| _______________ |
|
| Total | = | 374 VA |
In this example, a UPS with at least 374 VA capacity can be employed to protect the computer, monitor and external tape drive. However, a UPS with somewhat lower capacity may still be used if the following test for proper operation is successful.
3.6.7Once you have determined that your equipment and the UPS are compatible, plug your equipment into the UPS’s rear panel output receptacles.
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