Miller Electric MR-5 User Manual
Page 24
TROUBLE
PROBABLE CAUSE
REMEDY
No wire feed.
Robot signal.
Check input signal from robot to motor board
PC2. Signal should be 0-10 vdc between pins K
and B (common) on RC5.
-
Relay CR1 not working.
Replace CR1.
Motor board PC2 not work-
ing.
Replace PC2 (see Section 5-4).
Wire feeds at maximum.
Tach board PC5 at wire
drive motor not working.
Replace PC5.
No arc voltage control.
Voltage
control
connec-
tions.
Check and secure connections (see Section 2-3).
Wire stick sensing connec-
tions.
Check and secure connections (see Section 2-3).
Voltage board
PCi
not
working.
Replace PCi (see Section 5-4).
Incorrect robot command
voltage.
Check robot command voltage at voltage board
PCi. Command voltage should be 0-10 vdc bet
ween pins BB and CC (common) at RC25.
Robot shuts down due to
Touch Sensor error.
Touch Sensor connections.
Check continuity of leads between gun/torch and
gas/current sensing control. Repair or replace.
Secure all connections.
Robot moves when welding
wire is stuck.
Wire stick connection.
Be sure that red lead is connected to terminal 52
and blue lead is connected to terminal 50 on
welding power source interface 14 position ter
minal strip.
Wire stick sensing connec-
tions.
Check and secure connections (see Section 2-3).
Wire speed (1PM) meter
goes to zero.
Incorrect robot command
voltage.
Check robot command voltage at motor board
PC2. Signal should be 0-10 vdc between pins K
and B (common) at RC5.
Motor board PC2 not work-
ing.
Replace PC2 (see Section 5-4).
No wire retract.
Control relay CR2 not work-
ing.
Replace CR2.
Interface board
PC3 not
working.
Replace PC3 (see Section 5-4).
Incorrect robot command
voltage.
Check robot command voltage at motor board
PC2. Signal should be 0-10 vdc between pins K
and B (common) at RC5.
Robot shuts down.
Loose weld output connec-
tions.
Clean and tighten connections.
Interconnecting cords.
Check all interconnecting cords for breaks; repair
or replace. Check and secure all connections.
Interface board PC3 not
working.
Replace PC3 (see Section 5-4).
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