Miller Electric OM-842 - Manuel (Page 47)

OM-842 Page 43
is done in time and the push button is working correctly,
the display shows:
B U T T O N I S
W O R K I N G P R O P E R L Y
If the Purge push button tests okay, go to Step 5.
4. If the Purge push button is not pressed in time, or if the
push button is not working correctly, the display shows:
B U T T O N I S N O T
W O R K I N G P R O P E R L Y
If the Purge push button is not working correctly, re-
place the push button.
5. When the Purge push button tests okay, press Param-
eter Select to exit the Purge push button test. Use the
Right/Increase or Left/Decrease push button to access
another test, or stop the diagnostics program (see Sec-
tion 2-4).
H. +10 Volt DC Reference Test
This procedure tests the analog output circuitry of the micro-
processor control.
1. When the repeating test displays are shown (see Sec-
tion 7-2C), press Right/Increase or Left/Decrease until
the display shows:
+ 1 0 V R E F E R E N C E
T E S T
2. Press Parameter Select to begin the test. The display
shows:
C H E C K R M T 1 4 C ( + ) T O
D F O R + 1 0 V + / – . 0 5 V
3. Use a suitable VOM (volt-ohmmeter) to check for a dc
voltage within the specified range across pins C and D
of the Remote 14 receptacle. If an acceptable voltage
is present, press Parameter Select and go to Step 5.
4. If the correct dc input reference voltage is not found,
contact the nearest Factory Authorized Service
Station/Service Distributor.
5. The display shows:
C H E C K R M T 1 4 C ( + ) T O
D F O R + 5 V + / – . 0 5 V
6. Use the VOM to check for a dc voltage within the speci-
fied range across pins C and D of the Remote 14
receptacle. If an acceptable voltage is present, go to
Step 8.
7. If the correct dc input reference voltage is not found,
contact the nearest Factory Authorized Service
Station/Service Distributor.
8. When the analog output circuitry tests okay, press Pa-
rameter Select to exit the test. Use the Right/Increase
or Left/Decrease push button to access another test, or
stop the diagnostics program.
I. Output Contactor Test
WARNING
ELECTRIC SHOCK can kill; OPEN
CIRCUIT VOLTAGE ACROSS
OUTPUT TERMINALS is present
during testing.
•
Do not touch live electrical parts.
•
Disconnect any cables from weld output
terminals before performing test.
Have only qualified persons familiar with and
following standard safety practices perform this test.
This procedure tests the output contactor.
1. When the repeating test displays are shown (see Sec-
tion 7-2C), press Right/Increase or Left/Decrease until
the display shows:
O U T P U T C O N T A C T O R
T E S T
2. Press Parameter Select to begin the test. This ener-
gizes the output contactor. The display shows:
C H E C K V O L T M E T E R F O R
5 3 T O 6 7 V O L T S D C
3. The Voltage meter on the control unit should indicate a
voltage within the specified range.
If an acceptable voltage is not indicated, contact the
nearest Factory Authorized Service Station/Service
Distributor.
4. When the output contactor tests okay, press Parameter
Select to deenergize the output contactor and exit the
test. Use the Right/Increase or Left/Decrease push
button to access another test, or stop the diagnostics
program.