TS_610_01 PowerWAVE 6000 S3 (60-120kVA) User Manual 21/10/19
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2: General Description
2.3
UPS module functional description
Figure 2.2 PowerWAVE 6000 S3 (60-120 kVA) UPS module block diagram
2.3.1 UPS module block diagram
Figure 2.2 shows the major power blocks contained within the UPS system.
UPS Input supplies IA4 (1), IA3 (2)
The UPS has two sets of three-phase input supply terminals:
• The ‘mains supply’ (1) is connected to the rectifier power block via the input isolator (IA4).
• The ‘bypass supply’ (2) is connected to the static bypass line, via IA3, and the maintenance bypass line via IA1.
In practise, the bypass supply terminals (2) are often linked to the mains supply terminals (1) within the UPS cabinet so the
UPS effectively requires only one mains supply connection – see paragraph 3.3.2 for details concerning ‘single feed’ &
‘dual feed’ input configurations.
Maintenance bypass switch (3)
The maintenance bypass switch (IA1) provides a means of entirely bypassing the UPS power blocks and can be used to
temporarily connect the load directly to the bypass mains supply if it is necessary to fully power down the UPS for test/
repair purposes.
Note that the maintenance bypass switch is only rated for the individual cabinet’s load, so where two or more cabinets are
connected together to form a parallel UPS system the internal maintenance bypass switch (IA1) should not be used. In a
parallel system an external maintenance bypass facility must be incorporated into the system design which includes a
system-rated maintenance bypass switch – a typical external maintenance bypass installation is shown on page 24.
Rectifier (4)
The rectifier converts the input mains supply to a DC power source which is used to charge the batteries and provide the
DC power input to the inverter. The rectifier can satisfy the full inverter DC power demand (i.e. 100% rated UPS output)
over an input mains voltage range of -10% to +15%. If the input mains falls to -30% the rectifier can still provide up to 60%
of the inverter load.
CAUTION:
The UPS mains supplies are not internally fused. The input supply cables must be connected via an
external isolation device (fuse/circuit breaker) to provide overload protection and a means of disconnecting the
mains supplies to the UPS.
Key Point:
When the load is connected via the maintenance bypass switch (3) it is not protected against bypass
supply aberrations or total failure.
RECTIFIER
INVERTER
SWITCH
STATIC
CHARGER
BOOSTER
Maintenance Bypass Line
Static Bypass Line
Bypass
Mains
Input
Mains
Output
Supply
IA4
IA3
IA1
IA2
Output
Contactor
Batt. Fuse
Battery String
3
4
6
1
2
5
7
9
8
10
11
