NGPS – User’s Manual
38
AC Source Requirements
The NGPS power supplies are designed for 208 V AC, 400 V AC or 480 V AC
input range depending on the model (see
: NGPS versions); accepted input
frequency is in the range from 47 Hz to 63 Hz. Installation category shall be
CAT II
,
so the maximum voltage impulse on the network mains must be below 2500 V.
The NGPS power supply is designed to be connected to TN-C
or TN-S electrical distribution systems, but without Neutral
connection (pure three-phase system). NGPS is not suitable to
be used on IT electrical systems.
AC power supply lines shall be referred to Neutral and Earth
and must not float.
2.5
Load Connection
Turn off the AC input power before making or changing any
rear panel connection. Ensure that all connections are securely
tightened before applying power. There is a potential shock
hazard when using a power supply with a rated output greater
than 60 V
Wire Selection
The following factors must be considered when selecting the wires:
•
Current carrying capacity strictly linked to the cross-section area;
•
Maximum wire length;
•
Insulation voltage.
Wire size for the load connection should be selected to ensure the voltage drop
per lead to be less than 1 V at the maximum power supply current, in order to prevent
excessive output power consumption. Wire cross-section area and the corresponding
resistivity are listed in the following
WARNING
WARNING
