APC 480kW User Manual

Browse online or download User Manual for Power supply units APC 480kW. APC Silcon UPS and Diesel Generator

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Abstract
The APC Silcon UPS has the highest efficiency (AC-AC on-line UPS), at the same time as the input power factor has been
regulated to 1, and input current is sinusoidal. This means that APC Silcon has the lowest input power compared to any other
UPS systems sold in the market today. In this way it is easy to have APC Silcon operating correctly on a diesel, simultaneously
with the very flexible software programming of APC Silcon. At development of the APC Silcon series great efforts have been
made as regards control, regulations, as well as optimizing the whole operational mode of the APC Silcon UPS making it
completely optimal for operation on a diesel generator.
Introduction
UPS and diesel generator are two factors, which are closely united when it comes to ensuring the supply reliability at critical
installations. Especially in connection with longer back up times, typically >20min., it may be worth using a small battery
together with a diesel generator to meet the requirements for back up. However, very often the installation consists of a critical
part e.g. a computer and a less critical installation e.g. lighting, air condition. In connection with such an installation the most
advantageous constellation is to have the diesel generator supplying the less critical load, while the UPS is supplying the most
critical load. In that case the diesel generator will supply energy to the UPS after start-up, meaning that the batteries are being
saved.
However, experience from many installations has shown that it is not always that easy to have UPS and diesel working
together, as they are both regulated systems, enabling them to interact their regulators, which may result in instability. As the
UPS is typically the greatest single user on the diesel generator, it is an advantage to optimize in the UPS to stabilize the total
system, even if the UPS is not the factor causing the instability. To ensure an optimized interaction between diesel generator
and APC Silcon UPS more parameters can be re-programmed by the keypad on the front, which makes the APC Silcon UPS
very flexible.
Definitions
Slew rate (Hz/Sec.) means, how fast a frequency change takes place. For example: From 52Hz to 50Hz in 4 seconds results
in a slew rate of (2/4) 0,5Hz/Sec. The load determines the choice of slew rate. If it is a SMPS load (Switch Mode Power
Supply) 4,0Hz/Sec. can be used, but if it is rotating loads or phase controls 1,0Hz/ Sec. can typically be used. In case of
APC
APPLICATION NOTE #28
APC Silcon UPS and Diesel Generator
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Summary of Contents

Page 1 - APPLICATION NOTE #28

1 ____________________________________________________________________________________________________ Abstract The APC Silcon UPS ha

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2 ___________________________________________________________________________________________________ APC APPLICATION NOTE extensive inerti

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3 ___________________________________________________________________________________________________ APC APPLICATION NOTE Example of real

Page 4 - Test results

4 ___________________________________________________________________________________________________ APC APPLICATION NOTE Slew rate = 2Hz/

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5 ___________________________________________________________________________________________________ APC APPLICATION NOTE Fig. 2: Ramp-in

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6 ___________________________________________________________________________________________________ APC APPLICATION NOTE Fig. 3: Top: O

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7 ___________________________________________________________________________________________________ APC APPLICATION NOTE kW rating can th

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8 ___________________________________________________________________________________________________ APC APPLICATION NOTE Nominal Out [A]

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9 ___________________________________________________________________________________________________ APC APPLICATION NOTE If these values

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