MD Series
6. Explanation of the Screen
6-8
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(5) Setting the Precheck Welding (PRECHECK Screen)
Screen for setting the weld time and control voltage for precheck welding.
The precheck welding is a function to apply a small current under
constant-voltage control before regular welding to confirm that the part to weld is
set correctly by means of the measured current value.
The state of the part to weld is checked by the judgment of the current value
changing according to the resistance value under constant-voltage control.
When the value exceeds the upper or lower limit of precheck current, the fault or
caution of “E15:PRECHECK ERROR” occurs.
For precheck welding, set the voltage and time not enough to perform a welding.
For the upper and lower limits of precheck current, check and set the current
value changing according to the normal or abnormal state of the part to weld.
When the part to weld is not set, the resistance value becomes low and the
current value to measure becomes higher than normal. On the other hand, when
two or more parts are set or the contact is poor, the resistance value becomes
high and the current value to measure becomes lower than normal.
Note) When there is not much of a difference between the current values to
measure in the normal and abnormal states of the part to weld, the
current values may not be judged normally.
(a) SCH.#
Denotes No. of SCHEDULE (welding condition).
Input the schedule number to set. After welding, the number is switched to the
schedule number of the welding.
(b) TIME
Sets the time of precheck welding.
The setting range is 0.00 ms to 1.00 ms. Precheck is not performed at 0.00
ms.
(c) VOLT
Sets the voltage of precheck welding.
(a)
(b)
(c)
(d)
(f)
(e)
Summary of Contents for MD Series
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