Siemens SIMATIC MV420, Руководство по эксплуатации

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Safety notices
SIMATIC MV420 / SIMATIC MV440
14
Operating Instructions, 04/2013, A5E02371045-06
System expansions
Install only system expansions that are intended for this device. Installing other expansions
can damage the system or violate the safety provisions and regulations for radio interference
suppression. You can obtain information on system expansions suitable for installation from
the technical customer service or from the sales office responsible for your area.
NOTICE
Invalidation of the warranty
Any damage to the device caused by installing or replacing system expansion products will
void the warranty.
NOTICE
Voltage can destroy electrostatic-sensitive modules
The device contains modules that are sensitive to electrostatic discharge. Modules that are
sensitive to electrostatic discharge can be destroyed by voltages well below those that can
be perceived by human beings. Such voltages occur if you touch a component or electrical
connectors of a module without first discharging the static from your body. The damage
caused by overvoltage on a module cannot normally be detected immediately and only
becomes apparent after a longer period of operation.
Measures for protecting against discharge of static electricity:
•
Before working with modules, make sure that you discharge static from your body, for
example by touching a grounded object.
•
The devices and tools used must also be free of static charges.
•
Disconnect the power supply.
•
Hold modules only by their edges and do not touch any connector pins or conductors.
Connecting the 24 V DC power supply
WARNING
The device should only be connected to a 24 V DC power supply which satisfies the
requirements of safe extra low voltage (SELV).
When the device is operated on a wall, in an open rack or other similar locations, an NEC
Class 2 current source is required for the compliance of the UL requirements (in
accordance with UL 60950-1). In all other cases (according to IEC/EN/DlN EN 60950-1), a
current source with limited power (LPS = Limited Power Source) is required.
24 V DC supply voltage (19.2 to 28.8 V)
The generation of the 24 V DC supply voltage by the line-side power supply must be
implemented as functional extra-low voltage with safe electrical isolation according
(floating) to IEC 80364-4-41, or as SELV to IEC/EN/DlN EN 60950-1 and LPS/NEC class 2.