YAG Pulse Laser Power Supply For Welding System
150W/300W/600W Operation Manual
Shenzhen Anzhong Power Co., Ltd http://www.szazdq.com
- 29 -
Chapter VIII Protection Functions Description
8.1 Over-voltage and under-voltage protection
When voltage of power grid is more than rated voltage overvoltage and under-voltage
protection is on ,then,power supply is be protected.
It will display “voltage for bus is too low”.Laser-out signal is off, the front box is turned off
automatically.When the voltage of power grid return to normal,power supply should be started
again,then to work.
8.2 Over current protection
(1)Over current protection of front box IGBT
When the peak current is bigger than rated current of IGBT of front box,start the over current
protection to protect the power supply.Display <front box IGBT over current>Laser-out signal is off,
the front box is turned off automatically.
Turn off the power key switch for cutting of the electricity ,Next check main circuit. If the IGBT
is not broken,change the main board or display board.This maintenance work must be authorized or
qualified service personnel assigned to the operation by the manufacturer.
(2)
Over current protection of front box IGBT
When the peak current of back box A or B over the rated current of IGBT,enter the overcurrent
protection,then the power supply will be protected.
Screen displaying”IGBT of back boa A or B overcurrent”Laser output signal off ,front bax HV off at
the moment.
Turn off the key switch of power supply for cutting of the electricity . Next check main circuit. If
the IGBT is not broken,change the main board or display board.This maintenance work must be
authorized or qualified service personnel assigned to the operation by the manufacturer.
8.3 Output over-voltage protection
When output voltage over 680V,over-voltage protection is on and power supply is be
protected.Screen will display ”busbar is overvoltage”.Laser output signal off ,front box HV off at the
moment.