Universal Bypass Switch Unit
UNB
Operation Manual
UNB2357E / Page 7 (34)
4. Installation
Before installation of the system at the operation-site,
following rules are to be adhered to:
provided not otherwise expressed, the systems are
intended for inside-installation in dry, dust-poor areas
the specifications regarding ambient-temperature,
relative humidity and maximum altitude above see level, i
must be adhered to.
high dust-burden or a chemically aggressive atmosphere
is not admitted; the system is to be protected against
conductive moisture dust-settlements and condensation.
adequate cooling. Air-admittance is necessary, especially,
if the unit is installed in existing system cubicles or a 19 "
rack.
Before connecting to a network. To be controlled is whether
the voltage-statement on the type plate corresponds to both
power sources of the existing voltage. The connection of the
inverter as well as the substitute-network takes place via
plug- in terminal at the unit-rear. The unit is delivered
without internal safeguarding. The unit must be safeguarded
consequently at the input of both sources in order to avoid a
damage to the thyristor switch in the case of short-circuit.
The signalling unit is connected via the X2 plug- in terminal
as well as the frontal located CAN-BUS-interface.
The STATIC BYPASS SWITCH SBS works from a power range
of 12.5kVA with a temperature-controlled fan-cooling (with
supervision). The inflow temperature must not exceed 40 °
Celsius. Cubicle-installations have to be designed for a
maximum ambient temperature of 40 °C.
The load of the consumers is to be checked previously; a
permanent overload operation is not allowable and has an
effect extremely adverse on the reliability and designed
lifetime of the system. Especially, the inrush current of badly
tarnishing consumers are to be taken into consideration (a
simple Computer screen can lift up to 50 A inrush current! ).
The connection of a protection-phase is to be intended
generally in the interest of human safety. Short-term, the
STATIC BYPASS SWITCH SBS can manage very high
overload-conditions (see technical data).
The electrical connections have to be carried out in
accordance with the enclosed connection terminal-plan.
The diameter of the mains cable is to be calculated in
accordance to VDE 0100; generally the diameter should be
as large as possible, in order to keep voltage disturbances
over the inlet cables to a minimum.
