Kikusui PAD-L III Series, Operation Manual

Page: 37 / 132

PAD-L Precautions and Preparations for Use 2-9
2.6 Grounding the output terminal
The output terminals of this unit are isolated from ground. When the GND line of the
input power cord is connected to the ground terminal on the switchboard, the unit's
chassis assumes a grounding potential, as shown in Fig. 2-8. Cables and loads
connected to the output terminals (including the sensing terminal) must be isolated
from the chassis with at least the isolation voltage of the unit (*1, also see Table 2-2).
Terminal C and terminals 0 through 6 on the control terminal board on the rear panel
will have nearly equal potential on the circuit as the + (pos.) output terminal of the
unit. Additionally, terminals 7 and 8 will be at almost the same potential as the +
(pos.) terminal on the rectification smoothing capacitor of the unit (*2).
Accordingly, cables and devices connected to these terminals must be isolated with
at least the isolation voltage of the unit.
+
–
+
–
+
+S
–S
–
+
–
10
7
8
6
5
0
9
C
AC
input terminal
Output
terminal
Control
terminals
L
N
AC voltage, not used
Load
Ei
PAD-L
The output terminal is floating. The
shadowed area must be isolated from
the chassis with at least the isolation
voltage of the unit.
GND
GND
Almost the same potential
as the + (pos.) terminal on
the rectification smoothing
capacitor
Almost the same
potential as the
+ (pos.) output
terminal
Fig. 2-8 Without grounding the output terminal
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
DESCRIPTION
*1 Isolation voltage: The maximum external voltage that may be applied between
an output terminal on the power supply and ground (chassis).
*2 Rectification smoothing capacitor: A large capacitor used to smooth
secondary outputs (rectified sine waves) from the main power transformer that
have been rectified by a diode. The as-yet unstabilized voltage between the
capacitor terminals is greater than the output voltage.
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○