
B-65282EN/05 2.SPECIFICATIONS
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(6) Example of connecting the power supply of the main circuit
No. Power system Power specification Power supply of amplifier
1 TN-power system • Star connection
• Neutral grounding on the power
supply side
• PE provided on the power line
• Power supply voltage specification
400 VAC to 480 VAC (-15%,+10%)
• Directly connectable to the power supply
(No transformer is required.)
2 TN-power system • Star connection
• Neutral grounding on the power
supply side
• PE provided on the power line
• Power supply voltage specification
Not within the range 400 VAC to
480 VAC (-15%, +10%)
[When the power supply voltage is lower than
the specified power supply voltage]
The power supply voltage is increased with
an auto-transformer.
[When the power supply voltage is higher
than the specified power supply voltage]
The power supply voltage is decreased
with an auto-transformer.
3 TN-power system • Delta connection
• Single-phase grounding on the
power supply side
• PE provided on the power line
4 TT-power system • Star connection
• Neutral grounding on the power
supply side
• No PE provided on the power line
5 TT-power system • Delta connection
• Single-phase grounding on the
power supply side
• No PE provided on the power line
6 IT-power system • Star connection
• No direct ground connection made
on the power supply side
• No PE provided on the power line
• An isolating-transformer is used.
• A star connection is made on the
secondary side of an isolating-transformer,
and the neutral point is grounded.
7 IT-power system • Delta connection
• No direct ground connection made
on the power supply side
• No PE provided on the power line
• An isolating-transformer is used.
• A star connection is made on the
secondary side of an isolating-transformer,
and the neutral point is grounded.
* The TN-power system, TT-power system, and IT-power system
are based on the DC power distribution system standard
IEC60364.