Lincoln Electric OERLIKON CITOTIG 315 AC/DC Operator's Manual page 21

Note A: When AUTO is selected means 1s/10A; minimun
value is 3s.
Note B: for frequency value higher than 500Hz, PEAK is
locked to 50%.
Note C: In AC polarity the pulse frequency is limited to ¼
of the AC-frequency: : if AC frequency is 120Hz that
means the max pulse frequency is 30Hz . If the pulse
frequency is higher than 1/10 of the AC frequency, the
PEAK is fixed to 50%.
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