Technical data

1.3 Mains Connection
The design of the unit meets the requirements of safety class I according to EN 61010-1, i.e.
all metal parts accessible from outside and exposed to contact are connected with the
protective conducto of the supply network.
Power is supplied via a mains cable with earthing contact.
1.4 Installing the Power Supply Unit
The PN 300 should not be operated close to equipment that develops heat. To protect the PN
300 from thermal overload the slots on the rear side must not be covered and a free space of
about 10 cm should be ensured.
1.5 Switching on
The PN 300 is switched on using the power switch at the front. The power switch separates
the unit completely from the primary side of the transformer.
1.6 EMC
The PN 300 is interference-free according to EN 50081-1 and EN 50081-2. In order to fulfil
the limit values in line with present standards, it is absolutely necessary that only cables
which are in perfect condition be connected to the unit. The following information applies
here:
− Metallic or metallized socket cases must be used for the serial interface RS-232C. The
socket cases and the braided screen of the cables must be connected at the shortest distance
possible. The signal earth must not be connected to the braided screen.
− After opening and closing the PN 300 ensure that all the locating elements and contact
springs are installed as before and that all the screws have been tightened.
1.7 Inspection and Maintenance
If service is needed, due attention should be paid to the regulations according to VDE 0701.
The PN 300 should only be repaired by trained personnel.
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Operating Instructions PN 300
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