Introduction (cont.)
Operation with the normal AC source restored
See figure 9.
When normal AC source power (1) is restored or its voltage returns to within specified tolerances, the system automatically returns to its normal operating mode described above (on the condition it did not reach the end of battery power). If the end of battery power was reached (with the resulting inverter shutdown), the rectifier/charger
(A)restarts automatically, but the inverter (B) must be restarted manually. The rectifier/charger recharges the battery (D) which was discharged during the mains outage. During battery charging, light 2 flashes green.
The message "BATTERY CHARGING" is displayed, together with the value of the recharging current and battery voltage.
The battery charge cycle takes place in two steps (see figure 10):
◗step 1: the battery is recharged at a constant current limited to 0.1C10 (i.e. 1/10th of the battery capacity specified for a 10 hour discharge). The DC voltage increases with the battery charge until the charge level is reached;
◗step 2: the battery is recharged at constant voltage equal to the charge level (maximum value 463 V).
The charging current gradually decreases until reaching a specified low value (floating current).
For vented
Note 1:
If the normal AC source failure is shorter than 0 to 255 seconds (default value = 30 seconds) (parameter defined by
Note 2:
In frequency converters without battery power, the return of normal AC source power results in the automatic restart of the rectifier/charger and the inverter.
1 | 2 | 4 | 5 |
1 |
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2 |
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| A | B |
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1 |
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| D |
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| C |
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2 |
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Fig. 9
Battery charge cycle
U/I | voltage | U charge/floating |
| (sealed batteries) | |
|
| U "floating" |
|
| (vented batteries) |
| 0,1 C10 |
|
| current |
|
current | constant voltage | t |
limiting | decreasing current |
|
Fig. 10