Specifications
Galaxy 5000 technical specifications
MGE UPS SYSTEMS SPTC5 500 UK – 09/2005 page
10
Characteristics
The Galaxy 5000 charger can handle backup times from 5 minutes to 4 hours, thus making for easy selection
and adaptation of backup times. The charger is sized for high battery ratings and short charge times to
improve availability. For example, 10 minutes of backup time in less than 11 hours and 4 hours in less than 24
hours (complete discharge to Pn/2 and recovery of 90% of battery capacity).
Battery management
Charge system with independent digital regulation and monitoring devices
A microprocessor-based digital system regulates:
- the battery voltage using a measurement circuit
- the charge current using a measurement circuit.
The result is a DC voltage with ripple < 1%.
A second circuit, independent of the regulation, monitors the battery voltage and the charge current.
Consequently, if the regulation system fails, the monitoring system steps in to shut down the charger and
avoid overcharging. This system is required by certain standards (e.g. NFC 58-311).
Regulation of the battery voltage depending on the ambient temperature
A temperature sensor adapts the charge voltage to the ambient temperature.
The measurement is carried out locally (built-in batteries) by a sensor in the UPS cabinet or remotely by a
sensor in the battery cabinet. This regulation system takes into account the chemical reaction and prolongs
the battery service life.
The permissible temperature range (0 to 40°C by default) is set in the personalisation parameters. An alarm is
issued for temperatures outside the permissible range.
2.4 Battery
Characteristics
Galaxy 5000 batteries are sealed or vented lead-acid batteries, or Ni-Cad (on request). They cover all UPS
ratings (20 - 30 - 40 - 60 - 80 - 100 - 120 kVA). Available backup times are:
5, 10, 15, 30 minutes (catalogue)
1, 2, 3 or 4 hours (on request).
Batteries are made up of 30 to 36 blocks, each 12 volts. Each block is made up of cells.
Voltages for charged batteries are:
minimum 410 V (180 cells)
maximum 492 V (216 cells).
Battery operating modes and conditions
Normal AC power (charger input) is outside tolerances
The UPS switches to operation on battery power (inverter in autonomous mode) if the normal AC power goes
outside the input-voltage tolerances.
Amplitude:
- 342 to 470 V for operation at full rated load
- 250 to 470 V for a 70% load, except with the backfeed option.
Frequency:
- 45 to 65 Hz.
In this case, the quality of the normal AC power is not sufficient to correctly supply the double-conversion
process via the charger. The battery supplies the necessary energy during the available backup time. The
UPS continues to supply the load with a high-quality output voltage.
The frequency of the voltage is regulated with respect to the rated value (50 or 60 Hz):
by synchronising with the bypass AC power if it is within tolerances (see section 2.6). This technique makes
possible no-break transfer of the load to the bypass AC input (e.g. in the event of an overload). The
synchronisation range is user set (between ± 0.5% and ± 8%).
or autonomously by an internal quartz clock if the bypass AC power is outside tolerances. In this case,
transfer to the bypass AC input takes place with an interruption (permissible duration is user set from 13 ms to
1 second).
Limitation of operating time on battery power
Operation on battery power is limited to avoid excessive discharge and damage to the battery. The minimum
voltage is 297 V. Below this value, the inverter shuts down and the battery circuit breaker opens (see below