MGE
TM
Galaxy
TM
6000 : Specification guide
Parallel UPS, three-phase, 250 to 3000 kVA*
* Power rating for an N+1 redundant configuration
APC By Schneider Electric
Edition - 03/2009
Spec. E - 5
2.6 - UPS maintenance
For maintenance purposes, all electronic components shall be accessible from the front of the UPS.
In addition, a manually operated mechanical bypass system shall be:
…………………………………………………………………………………………………………………………………..
- Built into each UPS unit
(
)
for a two-UPS system with active redundancy)
…………………………………………………………………………………………………………………………………..
- Installed separately in the external maintenance bypass cabinet
(
)
with external maintenance-bypass cabinet)
…………………………………………………………………………………………………………………………………..
- Installed separately in the centralized bypass
(
)
with centralized-bypass cabinet).
This system shall be designed to isolate the UPS while continuing to supply power to the load from the bypass AC
source. The UPS shall also include a device making it possible to isolate the rectifiers and the chargers from the
normal AC source.
2.7 - Battery maintenance
For safe maintenance on the battery, the system shall include a circuit breaker to isolate the battery of each
parallel-connected UPS unit from the rectifier, the corresponding charger and the inverter. When the battery is
isolated from the system, the UPS shall continue to supply the load without interruption or disturbance, except in
the event of a normal AC source outage.
2.8 - Cold start (normal AC source absent)
The battery of each unit shall be capable of ensuring UPS start-up even if normal AC power is not available and
continuing operation within the specified back-up time (start on battery power shall be possible on the condition that
the system was already started with AC power present).
3 - Sizing and general characteristics
3.1 - Technology
Each unit in the UPS system shall be based on IGBT technology with built-in thermal monitoring and a high free-
frequency chopping mode to dynamically optimise efficiency and power quality.
3.2 - Rating
The UPS system shall be sized to continuously supply a load of
kVA, at a power factor (pf) of 0.8.
It shall be made up of ...[2 / 3 / 4 / 5 / 6]... UPS units, each with an identical rating of ...[ 250 / 300 / 400 / 500 /
600]... kVA.
The total installed power rating shall thus be
kVA. ...[Consequently, 1 (or 2) unit(s) may be redundant.]
3.3 - Battery backup time
The battery backup time in the event of a normal AC source outage shall be _______ minutes, for a load power
factor of 0.8.
Battery service life shall be equal to at least …
[
5 / 10
]
…years. It shall be selected and sized correspondingly, for a
load power factor of 0.8.
3.4 - Types of loads accepted
The UPS shall accept high crest factors (3:1) without derating to ensure correct operation with computer loads.
The total harmonic voltage distortion at UPS output (THDU downstream) shall respect the following limits:
ω
THDU downstream ph/ph and ph/N
≤
4% for linear loads;
ω
THDU downstream ph/ph and ph/N
≤
4 % for non-linear loads.
