FAULT FINDING
0464 523 010
- 14 -
© ESAB AB 2016
1. Check the PCB7. Measure the values on J1 and J5 test points on PCB7.
J1 test point values
Pin
Type
Value
1
-
GND = circuit common reference
2
input
PWAC = reference for driver DC AC board
(+15 V = DC mode - square wave 20-200 Hz AC mode)
3
-
GND = circuit common reference
4
-
GND = circuit common reference
J5 test point values
Pin
Type
Value
1
input
VOUT = reference signal from Vout
(64 V DC = 75 V DC no load voltage)
2
-
GND = circuit common reference
3
output
+15 V POT = +15 V DC power for primary inverter pwrn control
4
-
GND = circuit common reference
5
input
+IARC = common reference from secondary shunt
6
-
GND = circuit common reference
7
input
- IARC = set reference from secondary shunt (100 A = 30 mV)
8
-
GND = circuit common reference
9
output
ISET = set reference signal for primary inverter pwrn control
(0.04 V DC = 4 A - 1.9 V DC = 280 A)
10
-
GND = circuit common reference
11
output
-15 V = -15 V DC reference for primary inverter pwrn control
12
input
TMAX = signal from thermal sensors
(0 V = temp. ok - 2.2 V DC = overtemp)
13
output
INH = reference signal for primary inverter
( 4 V DC = inverter off -0 V = inverter on)
14
-
GND = circuit common reference
Is the problem solved?
Yes:
Go to chapter "At completion".
No:
Go to step 2.
2. Turn off the power source and wait for five minutes.
