5
2 Introduction
2.1 Safety instructions
Remove both mains plugs before opening the device!
Exercise caution when servicing the power supply unit. There is the risk of making contact with
parts which are live even when disconnected from the mains!
Operating indicators - where present - merely indicate the presence of DC voltages isolated from
the mains which supply power to the components of the device. However, operating indicators
which are not lit do not under any circumstances mean that the device is completely disconnec-
ted from the mains or non-live.
Both mains switches or mains plugs are used as a mains isolator and must therefore be accessi-
ble and able to be used at any time. When just one power supply unit is connected to the opera-
ting voltage and the mains switch is set to "on", the device is in operation. If the second power
supply unit is also put into operation, one operates in idle mode for as long as the other power
supply unit is supplying power to the device.
The device must be opened only by authorized specialist personnel inspected by the Chamber of
Industry and Commerce. The device must be repaired only by authorized specialist personnel
inspected by the Chamber of Industry and Commerce, or by sending it to ASTRO with the preci-
se description of the fault.
The mains cable(s) must be replaced only with original mains cables. Fuses must be replaced only
with fuses of the same type, value and melting characteristic.
Always observe:
DIN VDE 0701 - Parts 1 and 200, maintenance
EN 50 083 - Part 1, safety requirements
Do not carry out servicing work during thunderstorms
2.2 Assembly instructions
Protection from environmental influences:
The device must be connected and operated in dry rooms only. It must not be exposed to spray,
water droplets or similar influences. If condensation has formed, wait until the device has com-
pletely dried out. Objects filled with liquid must not be put down on the device.
The permitted ambient temperature is 0 ... 45°C.
Assembly environment:
The device is intended for operation in 19" racks, which are preferably metallically conductive and
which have sufficient air convection. It should be operated away from radiant heat and other heat
sources. The device must be installed only in rooms in which the permitted ambient temperature
can be maintained even if the climatic conditions change. To avoid trapped heat, it must be ensu-
red that air can circulate freely on all sides. Assembly in niches and unintentional covering of the
ventilation holes must be avoided at all times.
2.3 Equipotential bonding / grounding
The subscriber network must be and remain grounded as per the regulations in EN 60728 Part
11, even if the device is removed.
User Guide
U 261
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