Specifications
Galaxy 5000 technical specifications
MGE UPS SYSTEMS SPTC5 500 UK – 09/2005 page
11
the section on battery protection). For batteries on racks, it is necessary to take into account the voltage drop
in cables (approximately 5 V).
In the personalisation parameters, it is possible to disable this protection function and authorise inverter
operation until destruction of the battery (contractual option). This is often the case for fire protection where
continuity of service is the overriding priority.
Sleep mode
Galaxy 5000 offers a sleep mode (two minutes minimum) at the end of battery backup time, before opening of
the battery circuit breaker. In this mode, the control electronics and communications cards are supplied and
the UPS can communicate with a supervision system before opening of the battery circuit breaker and
complete shutdown. Sleep-mode parameters can be set up using the UPS Tuner software.
Load supplied
by normal
AC source
Sleep mode
Opening of the
t
Load supplied
by battery
2 min. to 2 hrs.
Fig. 6. Sleep mode.
Battery protection
Built-in circuit-breaker protection against excessive discharges
Galaxy 5000 is equipped with a circuit breaker to protect the battery. The breaker has an undervoltage release
to disable incorrect closing and provoke opening if necessary (e.g. emergency off).
It provides battery protection against excessive discharges.
The rating and position depend on the battery configuration (in the UPS cabinet or a separate battery
cabinet).
For batteries on racks, a circuit-breaker enclosure is installed as close as possible to the batteries and an
isolated input on the communication card is available to receive information on ventilation faults in the battery
room and shut down the charger in compliance with certain regulations (e.g. NF C15-100).
Opening of the battery circuit breaker is provoked by any of the following conditions:
- emergency power off, which results in shutdown of all converters
- end of UPS sleep mode (see here above)
- I battery charge > I safety, adjustable value (by default 50 A from 20 to 60 kVA, 70 A from 100 to 120 kVA)
- U Batt per cell > U Batt max. = 2.75 V (adjustable) for a duration of 200 ms.
Management of two battery circuit breakers
Galaxy 5000 can be equipped with and manage two battery circuit breakers. This function can be set up using
the UPS Tuner software. Battery availability is improved by dividing it into two sections. If one section is faulty,
the second is still available.
Battery circuit-breaker kit and enclosure
The kit comprising the circuit breaker(s) and the auxiliaries is housed in an enclosure that can be ordered with
or without an insulation-monitoring device.
It covers all UPS ratings (20 - 30 - 40 - 60 - 80 - 100 - 120 kVA).
Circuit-breaker selection is presented in the table on page 26.
Temperature
Battery operation is possible between 0°C and +35°C (40°C for 8 hours), but operation is optimum between
+20°C and +25°C. Backup time is significantly affected by temperature and is reduced at temperatures below
10°C. Above 25°C, battery service life is cut in half for every 10°C increase. Above 40°C, battery
manufacturers no longer guarantee operation (risk of thermal runaway).
Battery meter with automatic initialisation
The battery-meter function estimates the available backup time as a function of the battery charge and the
percent load. The meter is activated following a complete battery charge cycle (charge to 100%) during which
battery parameters are automatically identified.
Digibat battery technical monitoring
Galaxy 5000 is equipped with the Digibat system for battery digital management.
Based on a large number of parameters (percent load, temperature, battery type and age), Digibat controls
the battery charge voltage and continuously calculates:
The true available backup time
The remaining service life.
The system calculates the optimum cutoff value at the end of the backup time to avoid damaging the battery