Overload Protection - Miller SRH-333 Owner's Manual

5-2. Overload Protection

5-3. Troubleshooting Table
Trouble
No weld output; unit completely
inoperative.
No weld output; optional Power switch
pilot light on.
Unit provides only low or minimum
weld output.
Low weld amperage; Amperage Ad-
justment does not control amperage.
Maximum weld output.
Erratic or improper weld output.
Excessive line current or line fuse(s)
open repeatedly.
Fan not operating and/or over heating.
OM-2230 Page 24
1
Place line disconnect switch in On position (see Section 3-12B).
Check and replace line fuse(s), if necessary, or reset circuit breaker (see Section 3-12B).
Check for proper input power connections (see Section 3-12B).
Check for proper jumper link position (see Section 3-12A).
Clean and tighten all weld connections (see Section 5-1).
Check for proper line voltage.
Check for open line fuse(s), and replace if necessary. Check and replace circuit breakers (see Sec-
tion 3-12B).
Clean and tighten all weld connections (see Section 5-1).
Place Remote Amperage switch in correct position (see Section 4-3).
Select correct size weld cables (see Section 3-8).
Reset circuit breaker CB1, if necessary (see Section 5-2).
Have Factory Authorized Service Agent check Amperage Adjustment control.
Check for proper input power connections.
Clean and tighten all weld connections (see Section 5-1).
Use proper size and type electrodes.
Check for proper input power connections (see Section 3-12B).
Check for proper jumper link position (see Section 3-12A).
Check for and remove anything blocking fan movement.
Replace fan motor, if necessary.
1 Circuit Breaker CB1
CB1 protects the welding power
source control circuit from over-
load. If CB1 opens, weld output
drops to the minimum of the range
selected.
Press button to reset circuit break-
er.
Remedy
Ref. ST-800 040