MM-121B Weld Checker is used for resistance spot welders.
MM-131B Weld Checker is used for Capacitor Discharge type resistance welders.
Features
Stores 15 different windows. Measures and monitors weld current and cycles at every half cycle for each schedule.
Warning Light indicates weld conditions outside of set parameters.
Operates as a preset counter (up to 99,999 welds) to indicate number of welds completed.
Detects NO CURRENT via initiation signal input.
RS-422 (15 pin) Data out port.
Option external audio alarm and remote monitoring capability
Bright, easy-to-read, LED monitor displays.
Enclosed front panel protects against oil mist and dust
MM-121B
A high precision weld monitor for resistance spot welders. Measures both the weld current and the cycles and displays these values digitally, comparing them with the current and cycle parameters set by the user.
Miyachi MM-121B Weld Checker Specifications
Power:
Requirements:
110VAC ±10%, 50Hz/60Hz, automatic selection
Consumption:
15VA, not including "NG" (110V)output. 50VA max.
Current Measurement:
Pick-Up:
Toroidal coil
Ranges:
2 ranges:
9.99: 0.50-9.99KA
99.9: 0.50-99.9KA
Accuracy:
±2% against full scale or less
Value:
Average true RMS for measured interval regardless of wave shape.
Interval:
First: 1-99 cycles; Last: 1-99 cycles
Display:
3 digit, .3 in (.8 cm) 7 segment LEDs
Outputs:
Trigger-- indicated weld is being measured (1k, 5mA, 12VDC)
Signal-- analog wave form representing secondary wave form (1k, 5mA)
Both are available through a rear panel plug.
Cycle Measurement:
Ranges:
0.5 to 99.5
Accuracy:
Absolute
Display:
3 digit, .3 in (.8 cm) 7 segment LEDs
Current Monitoring:
Settings:
3 digit; 000-999
Gate Input:
Monitor inhibiting input
No Current:
Current drop below trigger sensitivity (2% against full scale) is regarded as "NO CURRENT", triggering a red LED when the external solenoid valve is off.
Limits:
HIGH and LOW each trigger red LEDs.
NORMAL triggers a green LED. There is an automatic reset at the beginning of the next weld sequence. The internal relay signal is output for 100mS.
Cycle Monitoring:
Settings:
HIGH and LOW -- two digit. 0.5-99.5cycles.
Limits:
HIGH and LOW each trigger red LEDs.
NORMAL triggers a green LED. There is an automatic reset at the beginning of the next weld sequence. The internal relay signal is output for 100mS.
Functions:
Schedule Setting:
15 schedules. The current schedule is selected by pressing the SCHED switch on the front panel, or via rear panel plug. 0-9 pulses. Measures and monitors impulse welding.
Counter:
1 setting for all 15 schedules.0 to 99,999
Preset: Flashing LED indicates when the preset number of welds is reached.
Step: Flashing LED indicated when the number of welds for step-up is reached.
Physical Properties:
Dimensions:
Height 8.9 in x Width 3.5 in. x Depth 12 in. (226mm x 90mm x 307mm)
Weight:
11 lb. (5kg)
MM-131B
Designed to deliver precise capacitor discharge type resistance welder monitoring. Measures both the weld current and the pulse width. The measured values are digitally displayed and compared against current and pulse width parameters entered by the user. It can measure both peak values (1p) and effective values (RMS) simultaneously and monitor either. The unit can also simultaneously measure pulse widths as time from the start of the welding until the peak current (Tp) is reached, and the time until the current reaches half of the peak (Th), and monitor one of these values. (See the Graph below)
Miyachi MM-131B Weld Checker Specifications
Power:
Requirements:
110VAC ±10%, 50Hz/60Hz, automatic selection
Consumption:
15VA, not including "NG" (110V) output. 50VA max.
Current Measurement:
Pick-Up:
Toroidal coil
Ranges:
2 ranges:
9.99: 0.50-9.99KA
99.9: 0.50-99.9KA
Accuracy:
±2% against full scale or less
Value:
Peak value or RMS regardless of wave shape.
Pulse Width Measurement:
Ranges:
2 ranges:
9.99: 0.50-9.99MS
99.9: 0.50-99.9MS
Accuracy:
± 1% against full scale
Display:
Value:
Tp (Time to reach peak of current value) or
Th (Time to reach Ip/2)
Weld Current and Pulse Width Monitoring:
High and Low Settings:
3 digit; 000-999
One Display for Both
No Current:
Current drop below trigger sensitivity (2% against full scale) is regarded as "NO CURRENT", triggering a red LED when the external solenoid valve is off.
Limits:
HIGH and LOW each trigger red LEDs.
NORMAL triggers a green LED. There is an automatic reset at the beginning of the next weld sequence. The internal relay signal is output for 100mS.
Functions:
Schedule Setting:
15 schedules. The current schedule is selected by pressing the SCHED switch on the front panel, or via rear panel plug.
Counter:
1 setting for all 15 schedules. 0 to 99,999
Preset: Flashing LED indicates when the preset number of welds is reached.
Physical Properties:
Dimensions:
Height 8.9 in x Width 3.5 in. x Depth 12 in. (226mm x 90mm x 307mm)
Weight:
11 lb. (5kg)
For further information, please contact T. J. Snow. We will be glad to help you select the correct weld checker for your application.
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