page 40
Monitoring primary current
The input current of the power units is monitored at the DCDRV pcb. The current is measured with an internal cur-
rent sensor, located on the pcb. As soon as the current is exceeding the maximum value, the CPLD (= Complex
Programmable Logic Device) shuts down the power unit immediately.
The welding current of the V40 and V50 is generated by two power units parallel. The V24 to V30 only have one
power unit.
Schematic
LED1
DCDRV1
A+
A-
X1 / 8
X1 / 7
X2 / 8
X2 / 7
CPLD
DSP
+15V
LED1
DCDRV2
A+
A-
X1 / 8
X1 / 7
X3 / 8
X3 / 7
+15V
DK-MAPRO
If power unit 1 draws too much current, the machine will stop and displays
E16
(primary overcurrent protection1).
If power unit 2 draws too much current, the machine will stop and displays
E24
(primary overcurrent protection2).
For example:
E16
(primary overcurrent protection1)
possible reasons could be:
- power unit 1 is broken (hardware defect, like broken MOSFET)
- power unit 2 is not active (if driver signals for the second power unit are missing or the DCDRV pcb of power
unit 2 is malfunctioning)
In this case power unit 1 has to generate all the weld energy by itself. Which is possible to a certain amount of
power (200A to 250A) but beyond that, the unit will stop with
E16
- malfunction at DCDRV pcb of power unit 1 (e.g. optocoupler output malfunction)
-
bad flat ribbon cables between MAPRO pcb and power units
Summary of Contents for V Series
Page 1: ...Service Manual V Series 909 0340 1 05 ...
Page 47: ...page 47 ...
