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- Power module control (driver switches on UST PC board)
- Operating panel control in the form of a databus connection (LocalNet)
- Evaluation of the mains switch signal coming from the BPS PC board:
a) Mains switch ON: Once the intermediate circuit voltage reaches a certain value,
the relays on the BPS PC board are controlled by the UST PC board
b) Mains switch OFF: UST stores present settings and activates the ventilators for
discharging the intermediate circuit capacitors
- Evaluation of signals from the temperature sensors; if there is a rise in temperature
and the ventilators do not cool sufficiently, (e.g. because the duty cycle was excee-
ded), the power source switches off and displays an appropriate service code.
- Ventilator control subject to temperature and firmware
- Data transmission to peripheral devices via LocalNet interface
- Regulation of welding current and welding voltage via the integral digital signal
processor (DSP) in the UST PC board
- Converter module control
Technical Data
Supply voltage (from NT 24A) 24 V DC
Function over-
view
Plug layout
Fig.39 Plug on UST PC board
(X4)
(X1)
(X6) (X2) (X8) (X7) (X5)
(X10)
(X9)
(X3)
Pin Function
X1 not assigned
X2 Connection to control panel
X3 Supply
Pin 1 +24 V external
Pin 2 NC
Pin 3 Intermediate circuit voltage
Pin 4 +24 V internal
Pin 5 GND external
Pin 6 NC
Pin 7 GND Intermediate circuit voltage
Pin 8 GND internal
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