Operating Instructions MG3 Digital
Technical Description
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2010-08-02
The values of the last 2.500 welds are stored temporarily in a battery-buffered memory
module. If this memory is full the complete measurement data packet is written onto the
compact flash card as log file.
In the standard version, parameters prepared for one measurement from 99 welding-
control programs can be monitored via a program number interface. Miyachi Europe
GmbH multiple program controls, too, are equipped with the corresponding interface.
Output of the selected parameters of each welding to a commercially available is possible.
For that purpose, connect the printer to connector X51 (RS232 interface). In the printer
menu, set the printer format to numeric for all measurements.
Operation of the instrument through a knob/push button combination.
2.2
Technical Data
Instrument type
MG3 Digital
Digital measuring and monitoring instrument
for resistance-welding installations
Program monitoring
99 programs, internal or external program
selection, extensible
Measuring functions
AC and DC, effective (r.m.s.) current value,
peak value of current, charge (I x t) and
further effective voltage value,
peak value of voltage, voltage integral (u x t)
and further power in variances, energy
resistance in variances, weld time (ms)
Counter
Up- and down-counter with prewarning and
final value signal output
Measuring range current
Coil x 1:
2–5–20–100–500 kA peak value
Coil x 10:
0.2–0.5–2–10–50 kA peak value
Measuring range voltage
0.5–2.5–10–50 V peak value
Measurement accuracy
±
1.5 % of upper limit of effective range for
current and voltage
Minimum measurable current I
s
±
3 % for power. 10 % from measuring
range, (for lesser currents special toroid coil
10-fold)
Maximum measurable current time
Approx. 2000 ms at DC, approx. 5000 ms at
AC
Minimum measurable current time
Approx. 1 ms
Sampling rate
(V, I) = 100 kHz per channel, simultaneous
sampling V, I of each channel
Graphic Resolution
Current/Voltage
Pressure/Force
Distance
measure time <= 50 msec: resolution 40
points per msec
measure time > 50 msec: resolution 5 points
per msec
Pressure/Force 10 points/ms
Digital distance 5 points/ms
Measuring interval
Variable
Note
The more graphics are displayed, data
through RS232 and limit value and envelope
curves are monitored, the longer the
measuring interval.
Flattest permissible current rise
di/dt
≥
2 A/ms at measuring range 2 kA. In
the higher measuring ranges correspondingly
more
Limit value setting
Independently from each other for the upper
and lower limit value across the entire
measuring range
