- the welding roll might be defect
- in case you use a mercury based welding roll
- the pendulum roll might be defect
- in case you use a mercury based pendulum roll
- the transformer step switch might be defect
- change transformer step switch
NOTE: The reason for the low current is due to an open circuit. The wire might be also hot in this case. If you have in general a high power percentage you might reduce the frequency.