YOKOGAWA AQ4305, Инструкция по эксплуатации, Страница: 10 / 50

4 Power supply and power cord Safety Precautions
viii
4 Power supply and power cord
The AQ4305 is Class I safety class equipment which has a protective ground and is structured to provide
sufficient protection against electric shock.
This unit can be grounded to protect against electric shocks from AC power supplies by connecting the
ground pin of a three-prong power cord or the ground terminal of a 3-prong/2-prong adapter to a power
outlet.
(1) Power supply
The AQ4305 works with 100-120,200-240V AC power supplies. The supply frequency
should be in the range of 48–63 Hz. In addition, use a rated voltage cable that satisfies
the operating voltage requirements.
(2) Power cable
The power cable is a 3-pin plug-type cable in which the pin in the center serves as the
ground pin. To the extent possible, this unit should be connected to a 3-prong outlet. If
you use a two-prong outlet, connect the power cable to the outlet through an adapter.
The ground wire from the adapter must be connected to an external ground or the earth.
4.1 Safety measures related to power supply
The AQ4305 will operate normally with 100-120,200-240V AC/48–63 Hz power supplies. However,
steps must be taken to protect against the following in supplying the AC power.
･
Injury due to electric shock
･
Damage to the unit’s interior due to abnormal voltage
･
Problems caused by ground current
(1) Power cord polarities
A 3-prong (or grounded-type 2-prong) power outlet with an earth terminal
(E) is connected as shown in Fig. 1 to the live line (L), neutral line (N),
and protective earth line (earth ground). Therefore, the included 3-wire
power cord is designed so that the power supply polarities will match
when the plug on the cord is simply inserted in a 3-prong (or grounded-
type 2-prong) outlet.
Fig. 1 3-Wire power cord plug and power outlet
100–120,200–240 VAC
power supply side
L
－
Live line
E
－
Earth ground line
Live
Protective ground line
3-prong power outlet
(or grounded-type 2-prong)
Neutral
100–120,200–240 VAC
N
－
Neutral line