THYRO SWITCH User Manual
Page - 2 - Version 1.0
EDEBDA0080 / 1707-1 GB
2 Safety Notes
Due to the design with forced cooling, that is with the use of a fan, unimpeded air intake must in particular be
guaranteed. The coolingopenings must not be coveredup. The distances specified from neighboring components
must be observed. For nominal load, there is an increase in temperature between fresh airand exhaust air of max.
40°C. Temperature-sensitive components such as cable ducts should be protected by cowls.
The THYRO SWITCH may only be operated with a series-connected power disconnecting device.
The THYRO SWITCH cannot function alone as a component and must be project-planned for use with a
compensation unit.
The THYRO SWITCH may only be deployed in the context of its intended use.
Even when used only as intended, a defect cannot be ruled out. In this case the currents and voltages in the load
circuit could be affected. In case of an error, the following cases are possible: Current interruption, half-wave
operation or constant energy flow. Correct design of protective devices must therefore be ensured during project
planning.
Incorrect operation or wrong connections could lead to destruction of the device or the load.
The THYRO SWITCH may only be connected with insulated crimping cable lugs.
Work such as assembly, maintenance and servicing may only be performed by skilled electricians. A soon as the
THYRO SWITCH is connected to the power supply system, the capacitive load is charged to network peak
voltage. In addition a phase is connected directly to the load. This means that the load is under voltage, even when
switched off, and remains connected to the power supply. When working on the load, disconnection from the
network must be made under all circumstances. Danger to life!
Even after disconnection from the network, a residual charge remains in the capacitive load. Before working on
the equipment, it must be checked that the capacitors are isolated from the supply. The discharge time of the
capacitors must be taken into account.
Note: Power capacitors must be equipped with permanently connected discharge devices and be discharged
within five minutes to a residual charge of 50µC at most, or a to a voltage of 60V. If this has a disturbing effect on
the function of the electrical equipment, a warning sign must be put up in a clearly visible position stating that the
discharge time is longer than five minutes. If it is possible to come into contact with the voltage of the capacitors,
with the correct use of connectors, and these connectors can be pulled off without the use of tools, the discharge
must be complete within one minute (See EN 50178, Section 5.2.5).
For the design of the discharge equipment it must be remembered that capacitors when switched off are charged
to a direct voltage at the level of the network peak voltage.
The parallel operation of facilities with conventional protective relaying and semiconductor technology is only
possible for reactor-protected equipment. Otherwise the THYRO SWITCH could be destroyed by the effects
of charge transfer.
