2-10 Before Using the Unit PAS SERIES
2.5 Grounding the Output Terminal
• For safety reasons, even if the output terminal is
grounded, make sure the insulation capacity of the
output terminal (including the sensing terminal) is
greater than the isolation voltage of the unit.
If you cannot obtain a cable with sufficient rated volt-
age, secure adequate withstand voltage such as by
p
assing t
he cable through an insulation tube with a
withstand voltage greater than the isolation voltage of
the unit.
If adequate insulation measures are not taken
a
ga
inst the isolation voltage of the unit, electric shock
may occur when grounding is poor.
• If the unit is to be remotely controlled through an
e
xt
ernal voltage source (Vext), do not ground the Vext
output (leave it floating). If the Vext output is
grounded in the example shown in Fig.2-11, the out-
put is short-circuited (which can cause accidents).
The output terminal of the unit is isolated from the protective ground-
ing terminal. By connecting the GND wire of the AC power cord to
the ground termi
nal of the switchboard, the chassis of the unit is set to
ground potential (see Fig.2-10).
Consequently, the cable and load that are connected to
the output ter-
mi
nal (including the sensing terminal) must have an insulation capac-
ity that is greater than the isolation voltage of the unit with respect to
the chassis.
In addition, pins 3 through 9 of the J1 connector on the rear panel (for
analog remote control and output monitoring) are at approximately
the same potential as the - (neg.) output terminal of the unit. There-
fore, cables and devices that are connected to these pins must also
have an insulation capacity that is greater than the isolation voltage of
the unit.
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