Miyachi MM-601B User manual

PRESSURE GAUGE FOR RESISTANCE WELDING MACHINE
MM-601B
OPERATION MANUAL
Thank you very much for purchasing the Miyachi Force Gauge MM-601B for
resistance welding machines.
zThis manual describes the operating procedure and precautions for the
MM-601B.
zPlease read this manual thoroughly to ensure proper operation of the
device. Keep the manual handy for future reference.
R09M0835E-08
SENSOR
ON
POWER
OFF
ZERO
HOLD
PRESSURE GAUGE
MODEL MM
-
601B

MM-601B
1
Contents
1. Special Notes ...................................................................................................1-1
(1) Safety Precautions..............................................................................................................1-1
(2) Precautions for Handling.....................................................................................................1-4
(3) Before Use ..........................................................................................................................1-6
2. Features............................................................................................................2-1
3. Packing List......................................................................................................3-1
(1) Main Body and Accessories................................................................................................3-1
(2) Options................................................................................................................................3-1
4. Names and Functions of Each Part .................................................................4-1
5. Measurement Method.......................................................................................5-1
6. Built-In Batteries ..............................................................................................6-1
(1) Charging .............................................................................................................................6-1
(2) Replacement.......................................................................................................................6-2
7. Specifications...................................................................................................7-1
8. Outline Drawing................................................................................................8-1
9. Calibration ........................................................................................................9-1
EC Declaration of Conformity

MM-601B
1. Special Notes
1-1
1. Special Notes
(1) Safety Precautions
Prior to use, read these “Safety
Precautions” carefully to gain a full
understanding of the proper method of
use.
•The precautions listed here are designed
to ensure safe use and proactively
prevent risks and damage to the user and
other people.
All precautions are critical for safety.
Please read them all.
•The hazard signs have the following
meanings:
WARNING
Indicates a risk of death or serious
injury if precautions are not correctly
observed.
CAUTION
Indicates operations and practices that may
result in personal injury or damage to the
equipment if not correctly followed.
These symbols indicate
"prohibition." They are warnings
concerning actions out of the
scope of the warranty of the
product.
These symbols indicate actions
that operators must take.
Each symbol with a triangle
indicates a DANGER, WARNING,
or CAUTION to the operator.
DANGER
Do not touch the inside of the device unnecessarily.
Burns or electric shock may result. Do not touch the inside of the device other
than for maintenance as described in the operation manual.
Never disassemble, repair or modify the device.
These actions can cause electric shock and fire. Do not do anything other than
the maintenance described in the operation manual.
DANGER
Indicates a high risk of death or serious
injury if precautions are not correctly
observed.

MM-601B
1. Special Notes
1-2
WARNING
Do not insert your fingers or hands between the electrodes.
When welding, keep your fingers and hands away from the electrodes.
Do not touch any welded part or electrode during welding or just after
completion of welding.
The welded parts of a workpiece, electrodes, and the arm are very hot.
Do not touch them; burns may result.
Apply the specified supply voltage.
Application of a voltage outside the specified range may result in fire or electric
shock.
Use the specified cables and connect them securely.
Failure to do so or improper connection may result in a fire or electric shock.
Do not damage connecting cables.
Do not walk on, twist, or pull on any cable. The power cable and connecting
cables may be broken, and that can cause electric shock and fire.
Do not use a damaged connecting cable or plug.
A damaged cable or a plug can cause electric shock, short circuits and fire.
If any part needs to be repaired or replaced, consult Miyachi or your distributor.
Stop the operation if any trouble occurs.
Continuous operation after occurrence of a trouble such as burning smell,
abnormal sound, abnormal heat, smoke, etc. can cause electric shock and fire.
If such a trouble occurs, immediately consult Miyachi or your distributor.
Persons with pacemakers must stay clear of the welding machine.
A person who uses a pacemaker must not approach the welding machine or walk
around the welding site while the welding machine is in operation, without being
permitted by his/her doctor. The welding machine generates a magnetic field and
has effects on the operation of the pacemaker while it is turned on.
Protective gear must be worn.
Put on protective gear such as protective gloves, long-sleeve jacket, leather
apron, etc. Spatters can burn the skin if they touch the skin.
Wear protective glasses.
If you look at the flash directly during welding, your eyes may be damaged.
If any surface flash and expulsion gets in your eye, you may lose your eyesight.

MM-601B
1. Special Notes
1-3
CAUTION
Remove any dust on the AC adapter and connect it securely.
Dust and improper connection of the AC adapter may result in heat generation
and fire.
Hold the plug when plugging or unplugging the AC adapter.
Do NOT pull on the power cord, as this may damage it, resulting in electric
shock or fire.
Unplug the AC adapter from the outlet if the gauge is not to be used
for an extended period.
Leaving the adapter plugged in may degrade the insulation, resulting in electric
shock, current leakage, or fire.
Use proper tools (wire strippers, pressure wire connectors, etc.) for
terminal treatment of the connecting cables.
Do not cut the wire conductor; fire or electric shock may result.
Use ear protectors.
Loud noises can damage hearing.
Keep combustible matter away from the device.
Spatter may ignite combustible matter. If it is impossible to remove all
combustible matter, cover it with non-combustible material.
Do not cover the device with a blanket, cloth, etc.
Do not cover the device with a blanket, cloth, etc. while it is in use.
The cover may be overheated and burned.
Keep a fire extinguisher nearby.
Keep a fire extinguisher in the welding shop in case of fire.
Maintain and inspect the device periodically.
Maintain and inspect the device periodically, and repair any damage nearby
before starting operation.

MM-601B
1. Special Notes
1-4
(2) Precautions for Handling
•Do not install the device in the following locations:
Damp areas (where the humidity is above 90%),
areas exposed to large amounts of vibration or shock, dusty areas,
areas near a high noise source,
areas where water may condense,
areas where chemicals are handled,
areas where temperatures are above 40°C or below 0°C,
areas exposed to direct sunlight, and
areas that is inclined, insecure, unstable, or weak
•Check the voltage and power frequency before installation.
•Operate the device in accordance with the method described in this operation manual.
•Never supply power to the welding machine while measuring the pressure using this
device, as it may cause malfunction or failure.
•Do not apply pressure exceeding the rated pressure of the sensor. Do not apply sudden
pressure or impact.
•Do NOT unnecessarily bend the sensor’s flexible joint, as this may damage the signal
wires.
•Use fully charged batteries. Even if the display does not prompt you to charge the
batteries, using batteries that are not fully charged may result in degraded measurement
accuracy. (Before using the gauge for the first time, always charge the batteries.)
•Do NOT insert a tool, screw, or anything other than a workpiece between the electrodes,
as a malfunction may result.
•Do not insert a screw, coin, etc. into the device, as they may cause malfunction.
•Press switches/buttons carefully by hand. Handling them roughly (using a screwdriver or
the tip of pen) may result in a malfunction or failure.
•Press switches/buttons one at a time. Pressing more than one switch/button at a time
may result in a malfunction or failure.
•Clean the exterior of the device using a soft, dry cloth or one slightly dampened with
water. If the device is very dirty, use diluted neutral detergent or alcohol. Do not use
paint thinner, benzine, etc., as they may discolor or deform the device.

MM-601B
1. Special Notes
1-5
•Use only the included or specified chargers.
•Do not charge for more than 48 hours.
•Do not short-circuit the plug while the charger is connected to an outlet.
•Do not short-circuit the connector of the charger using a screwdriver, etc.

MM-601B
1. Special Notes
1-6
•Do not use the accessory charger for any unit other than the MM-601B.
•Remove the charger from the outlet when it is not in use.
(3) Before Use
Install the attached ferrite core near the connector of the weld-force sensor (optional).
Ferrite core Secure it to the cable with a cable tie.

MM-601B
2. Features
2-1
2. Features
Model MM-601B is a device for measuring the pressure of the electrodes of resistance
welding machines that use a load cell (Load converter).
With the optional special sensor, this device can easily measure welding force over a wide
range (0.2 kg – 950 kg/0.2 daN – 931 daN).
•Simple operation using a total of four buttons
•Portable and readily usable
•Large, easy-to-read liquid crystal display
•Sheet panel that effectively protects against dust and oil mist

MM-601B
3. Packing List
3-1
3. Packing List
Check the contents of the package. In the case of damaged or missing items, please
contact Miyachi Corporation.
(1) Main Body and Accessories
Item Model Item No. Qty
Main body MM-601B - 1
MM-601B-00-00/01 UN305-7508 1158829 1Charger
MM-601B-00-03*- - -
Power plug for overseas, C
type (MM-601B-00-01 only) TI-64 1158830 1
Leather case A3-02945-003 1034458 1
Carrying case A3-02977 1034768 1
External hold input cable A-06916-001 1001784 1
Noise filter ZCAT3035-1330 1023719 1
UB band UB-100 1040159 1
Operation manual M0835E 1006875 1
* The MM-601B-00-03 does not come with a charger. Use a charger with the following
specifications.
Output: 7 V±10%, 100 mA minimum
Polarity: Negative Center
(2) Options
Item Model Item No.
MA-520-01 1000561
MA-521-01 1000562
Weld force sensor
MA-522-01 1000563

MM-601B
4. Names and Functions of Each Part
4-1
4. Names and Functions of
Each Part
HOLD IN
SENSOR
ON
POWER
OFF
ZERO
HOLD
PRESSURE GAUGE
MODEL MM
-
601B
Front panel
ANALOG OUT
Side
Bottom
(5)HOLD switch
(6)ZERO switch
(3)Power ON switch
(4)Power OFF switch
(7)Strap
(2)Liquid crystal
display
(1)Connector for
pressure sensor
(10)Connector for
external HOLD input
(11)Connector for
analog output
(9)AC adapter
terminal
(8)Rear cover
(1) Connector for pressure sensor
Connect the special pressure sensor (optional) suitable for the measurement range.
(2) Liquid crystal display
Shows information including measured values, battery-charging prompt message
(refer to p.6-1), and overload message (refer to p.5-2).
(3) Power ON switch
When this switch is pressed, the power for this device is turned on.

MM-601B
4. Names and Functions of Each Part
4-2
(4) Power OFF switch
When this switch is pressed, the power for this device is turned off.
(5) HOLD switch
To set or cancel the hold mode
Pressing this switch places the LCD display in hold mode, fixing the measured-value
display to the value when the switch is pressed.
In hold mode, “H” appears at the top right of the LCD display, with the measured value
on the display kept unchanged even if the force changes.
Pressing the hold switch again causes “H” to disappear, canceling the hold mode.
Changing the unit
Turn ON the power while pressing and holding this switch; the unit switches from “kg”
to “daN” or from “daN” to “kg.” (It remains enabled after the power is turned OFF.) After
the unit is changed, this switch can be used to set or cancel the hold mode (refer to the
above description).
(6) ZERO switch
Press to set the reading to 0.
(7) Strap
Hang the strap around your wrist to avoid dropping the gauge.
(8) Rear cover
Open to replace the batteries.
(9) AC adapter terminal
While the nickel-hydrogen batteries are being charged or when an external power
source is necessary, connect the special AC adapter to this connector.
(10) Connector for external HOLD input
This connector is used to hold (refer to (5)) a measured value with an external signal.
When an external HOLD input cable is connected and a contact input is applied in
order to activate a welding-machine timer, etc. through the cable, this device functions
as if the HOLD switch were pressed.
The HOLD function can be reset using only the HOLD switch, however.
The plug for external HOLD input is a 3.5-mm mini plug.
Warning
The external HOLD input must be a contact input. Never input voltage. If
voltage is input, it may not only damage this device but also create a hazard.

MM-601B
4. Names and Functions of Each Part
4-3
(11) Connector for analog output
This terminal is provided primarily to connect a measuring instrument such as an
oscilloscope in order to monitor the applied force.
When a force is applied to the force sensor, a voltage output is provided by the
supplied analog output cable. Examining the change in this voltage level enables
determination of the timing at which the force achieves equilibrium. This timing serves
as a guide when setting the initial force application time (squeeze time).
The output voltage is approximately 4 mV multiplied by the number on the screen
regardless of decimal point.
The measuring instrument to be connected requires an input resistance of 5 kΩor
more.
Example
The number on the screen multiplied by 4 is the output voltage, wherever
decimal point is placed, but only when “kg” is selected as the unit. Keep in mind
that the value is about 3.92 when “daN” is selected as the unit.
Reading Output voltage Reading Output voltage
0.01 kg 1.23 kg
0.1 kg → 1 × 4 = 4 mV 12.3 kg →123 × 4 = 492 mV
1 kg 123 kg
Note:
Since the sensor offset is included, a maximum of 280 mV is output even when
no force is applied. Note also that the rated voltage varies as well due to
variations in the rated output.
Caution
Conduct measurement to ensure that the analog output will not short-circuit.
The plug for analog output is a 2.5-mm mini plug.
Signal GND

MM-601B
5. Measurement Method
5-1
5. Measurement Method
1. Weld-force-sensor connection
Select an appropriate pressure sensor according to the range of the pressure to be
measured, and securely connect it to the weld-force-sensor connector of this device.
2. Input/output connection
When using the external HOLD input function, analog output function, etc., connect the
appropriate cable for each specific purpose.
When using an external power source, connect the attached AC adapter to the
external-power-source connector.
3. Turning on the power to the device
When using in the kg indication mode
Press the POWER ON switch to turn on the power to the device.
When using in the daN indication mode
Press the POWER ON switch with the HOLD switch pressed. Press and hold the
HOLD switch until “daN MODE” is indicated (for approximately 1 sec).
* Either indication mode can be selected only at the time the power to the device is
turned on.
4. Zero setting
Push the ZERO switch to set the indication to
zero.
5. Preparation of the weld-force
sensor
Hold the weld-force sensor so that it is aligned
with the welding-machine electrodes. The weld
force of the electrodes will be applied vertically to
the sensor. (See the figure at right)
Caution
•Prior to using the tester for the first time, be sure to charge the batteries, which
may not be sufficiently charged immediately after purchase. Refer to “Chapter 6,
(1) Charging” for the battery-changing procedure.
•Before starting weld-force measurement, be sure to turn off the power to the
welding machine, and confirm that it cannot weld. Applying power while the weld
force is being measured will damage the device.

MM-601B
5. Measurement Method
5-2
6. Welding
Perform welding as slowly as possible so that no significant impact is applied to the
weld-force sensor.
7. Holding and reading the indicated value
1) When the weld force is fully applied (equilibrium condition), press the HOLD switch
to maintain the indicated value.
If the external HOLD input function is used, the HOLD switch does not need to be
pressed.
2) When the indicated value is held, “H” appears at the upper right of the liquid crystal
display.
(If the device is in the daN indication mode, the letter “N” is replaced with “H.” It will
be replaced with “N” again when the hold is reset.)
3) Read the indicated value.
4) When the HOLD switch is pressed again, the hold is reset.
When the hold is reset, “H” disappears.
5) The hold mode can be cancelled only using the hold switch on the panel. Keep this
in mind when using an external hold input.
8. Peak hold
1) Press the HOLD switch.
When the Zero switch is pressed with “H” displayed, “P” appears and the device is
in the peak hold mode.
2) When the weld force more than 7% of full scale is applied (refer to table below), the
peak hold is performed. When the peak is held, “P” is replaced with “P.” An
additional weld force is applied, the indicated value changes.
MA-520-01 0.7 kg
MA-521-01 7 kg
MA-522-01 70 kg
3) Press the HOLD switch to cancel the hold mode.
Caution
If “OVER!!” is indicated and the buzzer sounds intermittently at this time, stop welding
immediately, as this indicates excessive weld force.

MM-601B
6. Built-In Batteries
6-1
6. Built-In Batteries
(1) Charging
When the power of the built-in batteries falls to a certain level, “BATTERY” starts flashing on
the LCD display. (This message flashes seven times, automatically turning OFF the power to
the gauge.)
If this message appears, follow the steps described below to charge the batteries.
In addition, keep in mind that you must fully charge the batteries prior to using the MM-601B
for the first time.
Note that this gauge can be used during charging.
(1) Firmly plug the included AC adapter into the AC adapter terminal.
(2) Plug the AC adapter into the outlet for a specified voltage.
(3) Approximately 15 hours are required to fully charge the batteries with the gauge power
turned OFF.
Precautions
Make sure the batteries are fully charged.
•If the battery power is very low, “BATTERY” may not appear on screen. If the
batteries are not recharged, their lives will be shortened.
•Even before “BATTERY” appears on the screen, using the batteries with a low
charge may result in degradation in measurement accuracy.
WARNING
Always use the AC adapter on a specified power line.
Using it under other power conditions may not only cause a malfunction, but also
result in fire or electric shock.
Precautions
Do NOT charge the batteries for more than 48 hours. Excessive charging will
shorten the service life of the batteries. Further, be sure to charge the batteries at
an ambient temperature of 35°C or lower.

MM-601B
6. Built-In Batteries
6-2
(2) Replacement
The built-in batteries will last three to five years under normal usage conditions, and can be
charged approximately 500 times for repeated use. (The service life varies depending on the
frequency of use. The battery life will be shortened if stored for extended periods without
being used.)
The batteries need replacing if the operation time is significantly shorter after normal
charging. Follow the steps described below to replace the batteries.
Battery
Item name Item No. Model Specification
Nickel-hydrogen
battery
1169000 210AAHCB-UC4 AA battery (UM-3)
IEC/JIS model No.: HR6
Voltage: 1.2 V
Capacity: 2050 mAh
(1) Remove the four screws
from the rear cover.
(2) Open the rear cover.
(3) Remove all four
nickel-hydrogen batteries
from the battery holder in
the gauge.
(4) Install four new
nickel-hydrogen batteries,
making sure the positive (+)
and negative (-) ends of
each battery face in the
proper direction.
(5) Replace the rear cover.
(6) Tighten the four screws of
the rear cover.
WARNING
Do NOT short-circuit between positive and negative terminals; fire may
result.
Precautions
Always use nickel-hydrogen batteries. Further, replace all four batteries with the
same type of batteries at the same time.
Do NOT mix new and old batteries or different types of batteries. Do NOT use
batteries other than nickel-hydrogen batteries.
！

MM-601B
7. Specifications
7-1
7. Specifications
Model name MM-601B
Indicator Liquid crystal display, 8 digits, 1 line
Power source Nickel-hydrogen batteries, 1.2 V × 4
Effective measurement
range
(The range is changed
automatically when the
sensor is replaced.)
0.20 kg – 9.50 kg / 0.20 daN – 9.31 daN
(When optional sensor MA-520-01 is connected)
2.0 kg – 95.0 kg / 2.0 daN – 93.1 daN
(When optional sensor MA-521-01 is connected)
20 kg – 950 kg / 20 daN – 931 daN
(When optional sensor MA-522-01 is connected)
Measurement accuracy Full scale ±5% (including the sensor accuracy)
Repeat of indication Approx. 20 times/sec
Decimal-point indication Automatically set and indicated according to the measurement
range
Unit indication Automatically set and indicated according to the measurement
range (Changeable between kg and daN)
Indication of polarity “-” is indicated in the case of a negative value.
(Relative value corresponding to positive value)
Indication of overload “OVER!!” is indicated and the buzzer sounds intermittently.
Indication of request for
charging
“BATTERY” flashes seven times, then the automatic power-off
mechanism functions.
Automatic power-off If no key is pressed for approximately 7 min., this mechanism turns
off the power. If no sensor is connected, this mechanism turns off
the power in approximately 3 min.
External holding of input The measured value can be held with an external contact input.
Analog output Voltage output Approximately 4 mV/count
(Absolute value including offset)
Load resistance 5 kΩmin.
Ambient temperature 0°C to +40°C
External dimensions 164 (H) × 74 (W) × 30 (D) mm (excluding projections)
Mass 500 g (including leather case)
Accessory charger* Input 100 V to 240 V AC, 50/60 Hz (MM-601B-00-00/01)
* The MM-601B-00-03 does not come with a charger. Use a charger with the following
specifications.
Output: 7 V±10%, 100 mA minimum
Polarity: Negative Center

MM-601B
8. Outline Drawing
8-1
8. Outline Drawing
(Unit: mm)

MM-601B
9. Calibration
9-1
9. Calibration
To maintain the performance of the MM-601B, it is necessary to calibrate it periodically. The
calibration is carried out at our factory. Send us your weld-force sensor with the MM-601B for
calibration. Because the conditions of degradation of the MM-601B differ depending on the
operation environment, it is necessary to calibrate the MM-601B and the weld-force sensor
together.
Contact Miyachi Corp. for details of calibration.