Bosch PST 6000 Series, Техническая информация, Страница: 26 / 63

Setup
2-4
1070 080 058-101 (2001.04) GB
2.3 Function
The thyristor power unit is designed for alternating current resistance weld-
ing. Key components of an AC welding system are the thyristor power unit,
the weld timer and the welding transformer.
The figure below shows the basic functional design.
50/60 Hz two-phase alternating current
50/60 Hz
Timer Thyristor
power unit
Welding
transformer
Welding
apparatus
Basic functional design of the AC welding process
2.4 Monitoring
In order to ensure high operational reliability, various monitoring functions
are incorporated in the PST 6000 thyristor power unit.
There is a thermostatic switch to signal any overload on the thyristor power
unit to the weld timer.
The weld timer will then output a ”Thyristor unit fault” message.
When the fault has been cleared, the error message is reset as follows:
D
with the reset button on the weld timer front panel
D
by an input signal for acknowledgement (type-specific)
D
by an input on the BOS-5000 operator interface
D
by an input on the Bosch operator terminal (BT)