Siemens SIMATIC Panel PC 870 Equipment Manual page 22

Starting Up the Computing Unit
The power cable should comply with the safety guidelines of the country
concerned.
Lay the cables so that no one can step on or trip over them. When connecting the
device, carefully study the pertinent information given in Chapter 2.
Never connect or disconnect power cables or data transmission lines during a
thunderstorm.
In an emergency situation (for instance, damage to the housing, controls or power
cable, penetration by liquids or foreign bodies), pull the power plug and contact the
authorized service department.
Check to make sure that the rated voltage for the device is the same as the local
mains voltage.
The computing unit must be switched off before connecting/disconnecting I/O
devices (keyboard, mouse, printer, etc.). Failure to do so can result in damage to
the computing unit.
A connector safety interlock is supplied with a 120 V/230 V power supply.
Caution
!
The computing unit with AC power supply is equipped with a safety–tested mains
cable and may only be connected to a grounding outlet.
Make sure that the outlet on the device or the grounding outlet–socket of the buil-
ding installation is not obstructed and is installed as close as possible to the devi-
ce.
The computing unit does not possess a mains switch. To disconnect the device
from mains completely, remove the mains plug. This place must not be obstructed.
When installing the device in a cubicle, a central mains switch must be provided.
Country–specific notes
For USA and Canada:
For the operation in Canada and the United States, use a CSA or UL-listed mains
cable.
The plug must comply to the NEMA 5-15 standard.
120 V supply voltage
Use a flexible UL–approved and CSA–marked cable featuring the following design
properties: three–wire SJT design, conductor cross section at least 18 to AWG,
max. 4.5 m in length and parallel grounding–type plug 15 A, at least 125 V.
230 V supply voltage
Use a flexible UL–approved and CSA–marked cable featuring the following design
properties: three–wire SJT design, conductor cross section at least 18 to AWG,
max. 4.5 m in length and tandem grounding–type plug 15 A, at least 250 V.
2-4
Panel PC 870 Computing Unit Equipment Manual
Edition 12/01