DC Power Supply [DPG-30R & DPG-MC60R, DPG-MC120R, DPG-MC240R]
3. Setup
24
3-3. Installing the DC power supplies and controller
3-3-1. Power receiving equipment
The AC input equipment below is required to operate this power supply (see Table 2-1 for details).
Phases
Voltage
Frequency
Capacity
Comments
Three-phase
380 to 480 V
50/60 Hz
41.5 kVA
Design transformers, etc.,
with spare capacity. *
* The above is the necessary power receiving capacity for a single power supply unit. The number
of power supplies differs depending on the system configuration. The actually used capacity
corresponds to the number of power supplies. Power for the controller is separately required.
* ULVAC recommends isolating the AC input for both the DC power supplies and the controller
with isolating transformers.
3-3-2. Class A grounding
This power supply's output voltage is over 1000 V, so it falls under the category of high voltage
equipment. Therefore, a Class A ground (previous term: Class 1 ground) with a ground resistance
of 10 Ω or lower is required.
According to Japanese standards, Class A grounding defined in the Electrical Equipment
Technical Standards is applicable.
If not completely grounded, the target device may be damaged and workers may be severely
impacted.
System ground
DC Power
Supply
Board
3Φ ＡＣ
input
380-480 V
Earth
* Wire with minimum earth cable length
*The ground connection is unnecessary when using the input cable
sold separately.
ＡＮＯＤＥ
3.5 m to 10 m
10 m or
longer
14 sq equivalent cable
recommended
Cabling suited to installation
8 mm
2
or larger electrical cable, ground
resistance 10 Ω or lower. In Japanese
standards, Class A grounding defined in
the Electrical Equipment Standards is
applicable.
DC Power
Supply output
cable
ＣＡＴＨＯＤＥ
DC Power
Supply
3Φ ＡＣ
input
380-480 V
Earth
Earth cable length
System ground
System earth
1Φ AC input
100-240 V
Controller
Earth
+
+
-
-
Figure 3-6 System ground wiring example
Caution