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| Illustration 1 | g01946036 |
UPS with common normal and bypass AC inputs |
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| Illustration 2 | g01946038 |
UPS system with separate normal and bypass AC inputs |
The UPS will make an interrupted transfer, if the bypass source is beyond the conditions that are stated below. The transfer will not be more than 100 milliseconds in duration.
- Bypass voltage greater than ±15%, from the rated output voltage of the UPS.
- Bypass frequency greater than ±2 Hz from the rated output frequency of the UPS.
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| Illustration 3 | g02162344 |
When sizing the upstream circuit breakers, the time and current curves for the UPS input and output fuses must be taken into account.
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Table 1
| Out of Tolerance Values for the UPS Short Circuit Current with the Inverter Coupled and the Bypass AC Source |
| Sn |
40KVA |
50KVA |
60KVA |
80KVA |
100KVA |
130KVA |
| In |
48 A |
60 A |
72 A |
96 A |
120 A |
156 A |
| Limitation |
230 A |
230 A |
230 A |
260 A |
435 A |
435 A |
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Table 2
| Line Current Values |
| Rated power of each UPS system |
Continuous input current at 480 v |
Input current at 480 v overload = 1.25 In limited to 10 min. |
Input current at 480 v overload = 1.5 In limited to 1 min. |
Fuse ratings |
| 40KVA |
48 A |
60 A |
72 A |
160 A |
| 50KVA |
60 A |
75 A |
90 A |
160 A |
| 60KVA |
71 A |
89 A |
107 A |
160 A |
| 80KVA |
95 A |
119 A |
143 A |
160 A |
| 100KVA |
119 A |
149 A |
179 A |
315 A |
| 130KVA |
154 A |
193 A |
234 A |
315 A |
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Table 3
| Normal AC source and Bypass AC source |
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UPS |
| Uin |
432 to 528 V |
| Input voltage range is permitted by the standard. |
310 to 528 V |
| Fin |
45 to 65 Hz |
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| Illustration 4 | g02162345 |
Power is supplied as a function of the input voltage. |
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| Illustration 5 | g02162346 |
Permissible overloads of the UPS as a function of time |
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Table 4
| General characteristics of the 60 Hz Battery UPS |
| Power in kVA |
40 |
50 |
60 |
80 |
100 |
130 |
| Normal AC input |
| Number of conductors |
Three phases and a ground |
| Reference voltage at Pn |
432 V to 528 V |
| Reference frequency |
45 Hz to 65 Hz |
| THDI |
Typically 3 percent at Pn |
| Power factor |
>0.99 |
| Bypass AC input |
| Number of conductors |
Three phases and a ground |
| Reference voltage at Pn |
432 V to 528 V |
| Reference frequency |
45 Hz to 65 Hz |
| Load Output |
| Number of conductors |
Three phases |
| Set the phase to phase voltages. |
480 V |
| Voltage variation |
± 1% |
| Adjustable frequencies and tolerance (on battery power) |
60 Hz ± 0.1 Hz |
| Voltage variation for 0 to 100% load step change |
± 1% |
| Permissible overloads |
150 percent for 1 minute or 125 percent for 10 minutes |
| THDU Ph to Ph and Ph to N for nonlinear load |
< 2% Ph to Ph |
| Battery |
| Standard battery technology |
Sealed lead acid battery (gas recombination) |
| Inverter |
| Active power (kW) |
36 |
45 |
54 |
72 |
90 |
117 |
| Heat losses in kW Heat. |
2.71 |
3.39 |
4.06 |
5.42 |
5.74 |
7.47 |
| Heat losses in Btu |
9250 |
11560 |
13870 |
18500 |
19610 |
25490 |
| Storage temperature range |
-13°F to 113°F (-25°C to +45°C) |
| Relative humidity |
20% to 95% non-condensing |
| Maximum operating altitude without derating |
3281 ft (< 1000 m) |
| Operating temperature range at Pn |
32°F to 104°F (0°C to 40°C) |
Note: The operating temperature range is 0° C (32° F) to 40° C (104° F). For overload conditions, the range is 0° C (32° F) to 30° C (86° F). The optimum operating range is within 20° C (68° F) to 25° C (77° F). The length of time for battery backup is adversely affected by high temperatures and low temperatures. The length of time for battery backup is reduced even greater at temperatures under 10° C (50° F). Above 25° C (77° F), battery service life is cut in half every 10° C (18° F). Above 40° C (104° F), battery manufacturers no longer guarantee operation due to the risk of thermal runaway.
Maximum Allowable Power
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| Illustration 6 | g02239193 |
Note: The maximum allowable power for six parallel UPS systems is limited to5 x Pn for 40kVA to 80kVA UPS systems. For 100kVA to 130kVA UPS systems, the maximum is up to4 x Pn.
