Operation Manual

xi
DL451 Modular I/O
Operator Manual
Precautions
Before installing, setting up or operating this equipment, make sure that you have read
and fully understand all of this section and the “IMPORTANT SAFETY INSTRUCTIONS” at
the front of this manual.
This equipment is supplied by a mains voltage that can cause electric shock injury!
The following must be observed in order to maintain safety and electromagnetic compatibility (EMC)
performance.
Safety warnings
Signal 0V is connected internally to the
chassis.
To electrically isolate the equipment,
switch off the mains on/off switch at the
rear of unit. Make sure that the power at
the mains outlet is off, and then disconnect
the mains cable from the mains outlet.
To avoid electrical shock do not remove
covers.
The power supplies - even the DC ones -
have a high current!
General precautions
In the event of ground loop problems,
disconnect the signal screen at one end of the
connecting cables. Note that this can only be
done when the equipment is used within a
balanced system.
Do not remove, hide or deface any warnings or
cautions.
Power
The power supplies contain LETHAL VOLTAGES
greatly in excess of the mains voltage and that
its rails can produce extremely large currents
that could burn out equipment and wiring if
shorted.
The internal power supplies are of the switch
mode type that automatically senses the
incoming mains voltage and will work where the
nominal voltage is in the range 100VAC to
240VAC.
A mains inlet is provided on the rear panel. The
correct lead for connection in the area to which
the unit was shipped is supplied with the unit.
The equipment should only be plugged into the
mains outlet using the supplied lead.
When removing the equipment’s electric plug
from the outlet, always hold the plug itself and
not the cable. Pulling out the plug by the cable
can damage it.
Never insert or remove an electric plug with wet
hands.
Handling the equipment
Completely isolate the equipment electrically
and disconnect all cables from the equipment
before moving it.
Take great care when lifting or moving the
equipment and always take its size and weight
into consideration.
Do not insert your fingers or hand in any gaps or
openings on the equipment, for example, vents.
Avoid inserting or dropping foreign objects, such
as paper, plastic, metal etc., into any gaps or
openings on the equipment, for example, vents.
If this happens, turn off the power immediately
and unplug the power from the AC outlets.
Then have the equipment inspected by the
manufacturer's qualified service personnel.
Installation
Before installing the equipment:
• Make sure the equipment is correctly
connected to the protective earth conductor
of the mains voltage supply of the system
installation through the mains leads.
• Power to the equipment must be via a fused
spur.
• Power plug must be inserted in a socket
outlet provided with a protective earth