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Using Multiple Load Banks
ASCO’s Sigma LT control system allows up to 25 load banks to be interconnected and
controlled from a hand-held as if they were a single unit. This means that multiple load
banks can be combined to match particularly large generating sets.
Figure 1-3
Connecting multiple load banks
An example of a multiple connected load bank application is for an HVAC testing and
verification in a data centre. The networked load banks produce heat discharge throughout
specifically selected areas in the data centre all controlled from a single Sigma LT hand-
held.
Note:
When multiple
load banks of different
capacities are used the
load applied is shared
proportionally depend-
ing on the ratio of the
load banks’ capacity.
The cable sizes for the
Supply-on-Test must
take this into account.
Total control cable length = 250m
Sigma interface cable
Load Bank
1
Load Bank
2
Load Bank
n
Sigma LT
Hand-Held
Supply
under
test
In
Out
In
Out
In
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Introducing ASCO’s Sigma LT load banks
Sigma LT load banks are resistive, portable and indoor load banks. Sigma LT load banks
can be controlled either locally or remotely. The load banks can be linked together in a
network to provide high capacity load tests with the functionality to control a specific load
bank in the network.
ASCO Sigma LT load banks are manufactured with painted or powder coated mild steel,
folded and pop riveted together to form a monocoque construction. Load elements are
cooled by a direct airflow provided by an axial fan.
The input and output ducts are protected by stainless steel mesh screens. All of the
electrical and electronic components are housed behind painted or powder coated mild
steel panels with IP54 protection.
All Sigma LT units are designed to be moved by either built in castors or with a forklift.
For more information about other load banks that ASCO can offer, please contact our sales
team.
Chapter One
Introducing ASCO Load Banks
