MM-400A
8. Operation Screens
8-70
setting, refer to Chapter 8, “n-2. SYSTEM SETUP (2) Screen.”
Measurable time: 300 ms max.
• LONG CYC-AC
Select this option to measure single-phase AC welding current for a long
period. When you have selected LONG CYC-AC, you cannot measure force,
external input (±10 V voltage or 4 to 20 mA current) and displacement.
Frequency: Automatically detected from the MM-400A’s power supply
Measurable time: 10 s max. (50 Hz: 500 CYC, 60 Hz: 600 CYC)
(5) FREQUENCY
When you have selected CYC***Hz-AC for TIME, set the frequency of the
current to be measured as follows: M050, M053, M056, M059, M063, M067,
M071, M077, M083, M091, M100, M111, M125, M143, M167, M200, M250,
M294, M417, M500, 050 to 250 Hz (in unit of 1 Hz).
Set the M*** frequency when using our AC inverter welding power supply.
(6) CURRENT RANGE
Select from the following five ranges. Select one which is larger than the
maximum current of welding current actually measured and close to the
measured current.
Set upper and lower limits in the following ranges depending on the type of
toroidal coil connected and according to the TOROIDAL COIL setting in the
BASIC SETUP (3) screen:
• When 1x sensitivity coil is used: 2.000 kA range, 6.00 kA range, 20.00 kA
range, 60.0 kA range, 200.0 kA range
• When 10x sensitivity coil is used: 0.200 kA range, 0.600 kA range, 2.000 kA
range, 6.00 kA range, 20.00 kA range
(7) VOLTAGE RANGE
Select from the following two ranges. Select one which is larger than the
maximum voltage of welding current actually measured and close to the
measured voltage.
6.00 V: 6.00 V range
20.0 V: 20.0 V range
(8) START TIME / END TIME
You can measure RMS current/voltage and mean power/resistance by
specifying an arbitrary range. Set the interval from the start to end of the
measurement as follows according to the TIME. However, this is not the
measurable time. For the measurable time, refer to TIME.
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