Control functions / Alarm messages
The TSM-AT observes permanently:
- voltage (availability & value)
- phase sequence
- capacitor rated current
- temperature of the power switches
When voltage, current or temperature-problems occur, the TSM turns-off and shows the
Error at the display.
At the same time, the error-description is stored in the error storage register (max. 16).
In the menu item “Error storage” the errors can be read out. So it is possible to
recognize also short-term malfunctions afterwards.
By supervising the capacitor current it is possible to identify dangerous operating
conditions, such as harmonic distortion. High current harmonics may cause the
destruction of the connected PFC capacitor. Over currents are measured by an
integrated measuring system. The module turns-off as long as the overload exists.
The highly advanced measuring circuit for self-observing of the thyristor switch protects
the capacitor and the application as well.
The alarm-signal of the temperature trigger switches-off the corresponding capacitor
branch. After disconnection the thyristor switch will cool down again. If the temperature
drops below the preset threshold value, the module will reconnect.
Errors are indicated via relay contact and visualized via Display.
All error messages are summarized as a centralized error message and the output
occurs via a relay contact. In the programming menu it can be selected if this output
should be stored or whether it should only be displayed during the malfunction.
NOTE THE FOLLOWING INSTRUCTIONS !
The power capacitors are permanent on high voltage ( up to 1500 VDC )
EVEN IF THE TSM-AT IS SWITCHED OFF !!
Please follow the instructions:
Don’t touch live parts in the PFC equipment !!
Warning signs in the equipment required!!
Wait 10 minutes after the main switch is turned off – until the voltage in the
system is down to an uncritical value.
In systems (690V grid) you need single-phase capacitors with a min. voltage of
440V! All capacitors have to switch in star-circuit. (L-N)
In systems (525V grid) you need single-phase capacitors with a min. voltage of
380V ! All capacitors have to switch in star-circuit. (L-N)
In dynamical PFC systems discharge reactors cannot be used!
( this would be a shortcut of the high-voltage DC )
In PFC systems without filter circuit reactors current limiting reactors are required (
e.g. BD-100 ) for the TSM.
For short circuit protection superfast electronic fuses for protection of the thyristor
are required, standard HRC fuses are not suitable
