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Amada MH-P20B-2 Series Operation Manual

Motor-driven resistance welding head
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MOTOR-DRIVEN RESISTANCE WELDING HEAD
MH-P20B-2□
MH-D20B-2□
OPERATION MANUAL
AA05OM1208811-05

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Summary of Contents for Amada MH-P20B-2 Series

  • Page 1 MOTOR-DRIVEN RESISTANCE WELDING HEAD MH-P20B-2□ MH-D20B-2□ OPERATION MANUAL AA05OM1208811-05...

  • Page 2: Table Of Contents

    MH-P20B-2□/MH-D20B-2□ Thank you for purchasing our Motor-Driven Resistance Welding Head MH-P20B-2□/ D20B-2□. ・This operation manual explains its method of operation and precautions for use. ・Before using, read this operation manual carefully; after reading, save it in a proper place where you can easily access. Contents 1.

  • Page 3: Special Precautions

    MH-P20B-2□/MH-D20B-2□ 1. Special Precautions CAUTION (1) Safety Precautions ！ Before using, read "Safety Precautions" carefully to understand the correct method Denotes operations and practices that of use. may result in personal injury or damage to the equipment if not correctly followed. These precautions are shown for safe use ■...
  • Page 4 MH-P20B-2□/MH-D20B-2□ WARNING ！ Do not put your hands between the electrodes When welding, keep your fingers and hands away from the electrodes. Do not touch any welded part or electrodes during welding and just after welding finished The welded part of a workpiece, electrodes and electrode holder are very hot. Do not touch them;...
  • Page 5 MH-P20B-2□/MH-D20B-2□ CAUTION ！ Do not splash water on the Welding Head Water splashed over the electric parts can cause electric shock and short circuits. Use proper tools (wire strippers, pressure wire connectors, etc) for termination of the connecting cables Do not cut the conductor of wire. A flaw on it can cause fire and electric shock. Do not damage the power cable and connecting cables Do not tread on, twist or tense any cable.

  • Page 6: Precautions For Handling

    MH-P20B-2□/MH-D20B-2□ (2) Precautions for Handling Do not install this Welding Head in the following: ■ ・Damp places where humidity is higher than 90%, ・Dusty places, ・Places where chemicals are handled, ・Places near a high noise source, ・Hot or cold places where temperatures are above 40°C or below 0°C, and ・Places where water will be condensed.

  • Page 7: Features

    MH-P20B-2□/MH-D20B-2□ 2. Features  Owing to motor-driven mechanism, stable electrode force is always obtained even if the electrode opening changes. Also, you don’t need to adjust the electrode opening finely when replacing electrode. The electrode force is 5 to 35 N (0.5 to 3.5 kgf) per electrode on MH-P20B, and 10 to 70 N (1 to 7 kgf) on MH-D20B.

  • Page 8: Name And Functions Of Each Section

    MH-P20B-2□/MH-D20B-2□ 3. Name and Functions of Each Section (1) MH-P20B Weld Force Adjustment Knob ① Adjusts the electrode force. Lock Screw ② Locks the Weld Force Adjustment Knob. 3. Name and Functions of Each Section...
  • Page 9 MH-P20B-2□/MH-D20B-2□ Holder ③ For fixing the Electrode Holder (sold separately). ATTENTION Should a metal object, such as a screwdriver and wire, contact the Holder during operation, the object may be welded to the Welding Head. Before starting work, be sure to remove all metal objects from around the equipment. Body-Fixing Screw (M6) ④...

  • Page 10: Mh-D20B

    MH-P20B-2□/MH-D20B-2□ (2) MH-D20B Weld Force Adjustment Knob ① Adjusts the electrode force. Lock Screw ② Locks the Weld Force Adjustment Knob. Weld Force Conversion Graph ③ Shows an approximate electrode force for your weld force adjustment. Electrode ④ For spot welding. Material is CrCu. 3.
  • Page 11 MH-P20B-2□/MH-D20B-2□ Electrode Holder ⑤ Clamps the Electrode. ATTENTION Should a metal object, such as a screwdriver and wire, contact the Electrode or the Electrode Holder during operation, the object may be welded to the Welding Head. Before starting work, be sure to remove all metal objects from around the equipment.

  • Page 12: Controller Front

    MH-P20B-2□/MH-D20B-2□ (3) Controller Front Panel  Operation Button Operate the Welding Head by turning the button clockwise/counterclockwise or pressing it. TROUBLE SPEED By turning the button, the lamp HOLD TIME illumination changes as shown: W E L D H E A D READY C O N T R O L U N I T READY...
  • Page 13 MH-P20B-2□/MH-D20B-2□ ⑫ [SPEED HOLD TIME] Display Indicate the “electrode speed” and “HOLD Time after the application of weld force is completed”. The larger number indicates the faster electrode speed and the longer HOLD Time. And the lamp lights up simultaneously with other lamps as follows: Lamp When illuminated, When blinking,...

  • Page 14: Controller Rear

    MH-P20B-2□/MH-D20B-2□ (4) Controller Rear Panel  [MOTOR CONTROL] Connector It is a connector for controlling a motor to drive the electrode.  I/O Connector It is for input/output of signals.  Connector for Weld Force Detecting Sensor It is for inputting the weld force signal of the welding head.

  • Page 15: Interface

    MH-P20B-2□/MH-D20B-2□ 4. Interface (1) Connection Diagram of External Input/Output Signal Motor Head Controller External Input/Output Connector 24VDC Å -COM SCH1 SCH2 SCH4 SCH8 SCH16 +COM +COM Spare: Do not connect -COM +COM EXT.COM -COM RESET P.LOCK Spare: Do not connect STOP WELD START READY...
  • Page 16 MH-P20B-2□/MH-D20B-2□ [Example of Connection] ・When contacts are used as input terminal of I/O connector Å 24VDC + C O M -COM +COM EXT.COM -COM ・When NPN transistor (sink type) on PLC is used as input terminal of I/O connector Å 24VDC +COM -COM...

  • Page 17: I/O Connector

    MH-P20B-2□/MH-D20B-2□ (2) I/O Connector Each pin on I/O Connector is described. Input signal is explained as contact input. Description Internally connected to GND (0V). Select a schedule number, referred to as SCH No. below, indicating a combination of the circuit-closed pins among Pins, No. 2, 3, 4, 5 and 6 (See table below.).
  • Page 18 MH-P20B-2□/MH-D20B-2□ Description Output pins for 24 V DC through 100Ω internal resistor. Input pin for start-up signal. When [1ST] is closed, electrode moves from Start Point to Mid-Point. Input When [2ND] is closed after [1ST] was closed, electrode moves from Mid-Point to Weld Point.
  • Page 19 MH-P20B-2□/MH-D20B-2□ Description Input pin for Start Point resuming signal. When the circuit of Pin 17 becomes closed, the electrode resumes Start Point. (In case that the motor finishes moving back to Original Point, the electrode does not move.) Input pin for [RESET] signal. If a trouble occurs, rectify the trouble and close the circuit of the Pin to Input turn off [NG] signal.
  • Page 20 MH-P20B-2□/MH-D20B-2□ Description Common terminal to [READY], [START POINT], [MID POINT] and [ERROR] Output pin for a trouble signal. ERROR When a trouble occurs in Output MH-P20B/D20B, the Pin OUT COM becomes opened until it is reset. or 31 Spare pin: Do not connect. Common terminal to [READY], [START POINT], [MID POINT] and [ERROR] Do not connect to the Pin for [EXT.

  • Page 21: Installation And Connection

    MH-P20B-2□/MH-D20B-2□ 5. Installation and Connection Before using your MH-P20B/D20B, install it according to the following procedures. WARNING ！ Connect the grounding wire to the grounding terminal located near the grounding mark. CAUTION ！ When using, install and fix the Welding Head firmly. If you use it not fixed, it may cause injury due to its fall, and degraded weld quality.
  • Page 22 MH-P20B-2□/MH-D20B-2□ Installing the MH-P20B/D20B ③ Install the MH-P20B/D20B to the workbench with the supplied hexagon socket head bolts/cross-recessed countersunk head screws, plain washers, spring washers and hexagon nuts (See drawings below). Use a proper tool suitable for the bolts/screw to secure the Head.
  • Page 23 MH-P20B-2□/MH-D20B-2□ Installing the Electrode Holder ⑤ (The steps  and  are required for MH-P20B only. Proceed to step  for MH-D20B.) Holder-mounting screw Remove the Holder-Mounting Screw using the supplied hexagon rod spanner for M4. Electrode holder Fit the Electrode Holder (sold (sold separately) separately) into the Holder groove.
  • Page 24 MH-P20B-2□/MH-D20B-2□ Connecting the Volt-Sensing Cable ⑦ When employing the voltage-detecting function of our Welding Power Supply, Weld Checker, etc., connect the Volt-Sensing Cable to the Electrode Holder. On the MH-P20B, connect the Volt-Sensing Cables on the right and left Holders. ATTENTION The Volt-Sensing Cable is sold separately.

  • Page 25: Operation

    MH-P20B-2□/MH-D20B-2□ 6. Operation (1) Getting Started  Position of Electrode The MH-P20B/D20B Electrode has five (5) positions to stop. Position Description Original Point The position where the electrode has completely returned. A little bit farther position from Original Point. It can be set Start Point arbitrarily.

  • Page 26: Mode Setting

    MH-P20B-2□/MH-D20B-2□ ２ Ｎ Ｄ Start-up １ Ｓ Ｔ Ｏ Ｆ Ｆ SCH No SCH 1 SCH 2 Ｓ Ｃ Ｈ Input S t a r t P o i n t ( S C H 1 ) Electrode S t a r t P o i n t Movement ( S C H 2 ) M i d - P o i n t...

  • Page 27: Applying Power And Moving To Start Point

    MH-P20B-2□/MH-D20B-2□  Change of ERROR Signal Output Press the operation button while “1” blinks on [SPEED HOLD TIME] Display. Mode No. blinks on [SCH (SCHEDULE)] Display. Rotate the operation button to select “0” or “1”. ・0……means “circuit opened in case of error” ・1……means “circuit closed in case of error”...

  • Page 28: Auto-Setting Of Electrode Position

    MH-P20B-2□/MH-D20B-2□ (4) Auto-Setting of Electrode Position The electrode position can be set automatically by means of the auto-setting function. Turn the operation button to light up [AUTO] Lamp. Press the operation button for 1 second, and [AUTO] Lamp blinks. Close External Input [1ST], and the electrode moves to Original Point. Open External Input [1ST] when electrode stops with beeps.

  • Page 29: Manual Setting Of Electrode Position

    MH-P20B-2□/MH-D20B-2□ (5) Manual Setting of Electrode Position  Selecting Schedule No. Turn the operation button to light up [SCH] Lamp. Press the operation button for 1 second. [SCH] Lamp and [SCH] Display blink. Turn the operation button clockwise and counterclockwise to select a numeral (1 to 31) on [SCH] Display.
  • Page 30 MH-P20B-2□/MH-D20B-2□  Changing Moving Speed between Start Point and Mid-Point Turn the operation button to light up both [READY] and [MID] Lamp. Press the operation button for 1 second. [READY] and [MID] Lamp blink. The number of blinking [SPEED HOLD TIME] Lamp indicates the current speed setting.
  • Page 31 MH-P20B-2□/MH-D20B-2□ When you want to interrupt the operation, Press [ORG/CANCEL] button, and [MID] Lamp blinks fast. Close External Input [1ST]. The electrode returns to the previous position with beeps. In case of Mode 1, it works by pressing the operation button in addition to External Input.
  • Page 32 MH-P20B-2□/MH-D20B-2□ [In case that the electrode cannot move beyond Weld Point because of a workpiece] Turn the operation button until the electrode stops, then press the operation button. Downstop Point is set 5 mm beyond Weld Point and [WELD] Lamp blinks fast. Close External Input [1ST].
  • Page 33 MH-P20B-2□/MH-D20B-2□ ２ Ｎ Ｄ ２ Ｎ Ｄ Start-up １ Ｓ Ｔ Ｏ Ｆ Ｆ END Signal Ｅ Ｎ Ｄ Input Start Point Electrode Mid-Point Movement Weld Point WELD WELD START START Output Additional Pressing Time  Setting of Hold Time Turn the operation button to light up [HOLD] Lamp.

  • Page 34: Welding Work

    MH-P20B-2□/MH-D20B-2□  Setting Moving Speed from Weld Point to Mid-Point Turn the operation button to light up both [MID] and [WELD] Lamp. Press the operation button for 1 second. [MID] and [WELD] Lamp blink. The number of the blinking [SPEED HOLD TIME] Lamp indicates the current speed setting.

  • Page 35: Measuring Weld Force

    MH-P20B-2□/MH-D20B-2□ After the weld force of the electrode is released, open External Input [both 1ST and 2ND]. Then, the electrode returns to Start Point. In case that External Input [1ST] is closed, the electrode returns to and stops at Mid-Point. When External Input [2ND and 1ST] is closed while the electrode is at Mid-Point, the electrode starts to apply the weld force again.

  • Page 36: Fault Indications

    MH-P20B-2□/MH-D20B-2□ 7. Fault Indications When a trouble occurs at the apparatus, [TROUBLE] Lamp lights up and a fault code is shown on [SCH] Display. Closing External Input [RESET] or continuing to press the operation button can reset the fault signal. Fault Code Trouble Content Corrective Measures...

  • Page 37: User's Maintenance

    MH-P20B-2□/MH-D20B-2□ 8. User’s Maintenance ATTENTION  Make sure that the tool used for adjustment fits the screw size. Upon completion of adjustment, tighten the screws firmly. There should be no looseness or rattling.  The Holder is made of soft material. When tightening a screw, take care not to damage it.
  • Page 38 MH-P20B-2□/MH-D20B-2□ Installing and Replacing the ③ Electrode (Sold separately) (Electrode Holder Unplug the AC Cable from the Top View) outlet to turn off the welding Insert Electrode power supply. into this hole. Loosen the Electrode-Fixing Screw using the supplied M4 hexagon rod spanner.
  • Page 39 MH-P20B-2□/MH-D20B-2□ How to Use the Weld Force ⑥ The line graph you u se Conversion Chart depend s on the numerical value here. Two line graphs are shown in the MAX: Weld Force Conversion Chart. MH-P20B加圧力換算グラフ Take care to use the line graph 本...

  • Page 40: Mh-D20B

    MH-P20B-2□/MH-D20B-2□ (2) MH-D20B Aligning the Electrodes ① Unplug the AC Cable from the outlet to turn off the power supply. Loosen the Holder-Mounting Screws. Rotate or move back and forth the Electrode Holders to align the upper and lower electrodes as shown at lower right. Holder mounting screw Holder fixing screw If you cannot align the electrodes, loosen the Holder-Fixing Screw to move right...
  • Page 41 MH-P20B-2□/MH-D20B-2□ Replacing the Electrode and Adjusting the Electrode Position ③ Unplug the AC Cable from the outlet to turn off the power supply. Loosen the Electrode-Fixing Screw using the supplied M4 hexagon rod spanner. Electrode fixing screw When replacing the electrode, remove the old one and insert a new one.

  • Page 42: Specifications

    MH-P20B-2□/MH-D20B-2□ 9. Specifications (1) Product Specifications Items MH-P20B-20 MH-P20B-21 MH-D20B-20 Head Type For series welding For direct welding 8–35 N 5–25 N 10–70 N Electrode Force (Approx. 0.8–3.5 kgf) (Approx. 0.5–2.5 kgf) (Approx. 1–7 kgf) Stepless adjustment Stepless adjustment Stepless adjustment Weld Force Spring forced Method...

  • Page 43: Timing Chart

    MH-P20B-2□/MH-D20B-2□ (3) Timing Chart  Power ON and Error occurring Switch of Ｏ Ｎ Apparatus Ｏ Ｆ Ｆ Ｏ Ｎ Power Supply to Motor Ｏ Ｆ Ｆ １ＳＴ or ＯＲＧ Start-up Ｏ Ｆ Ｆ Original Original Point Point Start Start Movement Point Point...
  • Page 44 MH-P20B-2□/MH-D20B-2□ See figures on the next page for the distance between electrodes installed into the Electrode Holder. The distance between electrodes installed into the Electrode Holder (sold separately) (Unit = mm) The minimum distance The maximum distance between electrodes between electrodes M K - H 0 5 - 0 0 for φ3 electrode M K - H 0 5 - 0 1...
  • Page 45 MH-P20B-2□/MH-D20B-2□ φ4 Straight Electrode MH-P20B-20/-21  Model No. Size (Material) M4-00083 φ4 x 50 (Cr-Cu alloy) φ4 x 50 ( alumina-dispersed- Z-02712-001 strengthened-copper) Z-02712-002 φ4 x 50 (MCZ) Z-02712-003 φ4 x 50 (Tungsten) Z-02712-004 φ4 x 50 (Molybdenum) φ3 Eccentric electrode MH-P20B-20/-21 ...

  • Page 46: Data Communication

    MH-P20B-2□/MH-D20B-2□ 10. Data Communication (1) Communication Specifications RS-232C: RS-232C, Asynchronous, Teletype procedure Method RS-485: RS-485, Asynchronous, Half-Duplex Transmission 9600 bps rate Start bit: --------- 1 Data bit: --------- 8 Data type Stop bit: --------- 1 Parity bit: -------- 1 (Even parity) ASCII Character code (CR code is indicated as “...
  • Page 47 MH-P20B-2□/MH-D20B-2□  RS-485 Signals of RS-485 use (RS+) and (RS-). The communication connector is within the external connector cover. Short-circuit between Pins 7 and 10. MH-P20B/D20B MH-P20B/D20B External connector Pin No. TRO U BLE SPEE D HOLD TIM E Host Computer WELD HEAD REA D Y CONTROL UNIT...

  • Page 48: Bidirectional Communication

    MH-P20B-2□/MH-D20B-2□ (3) Bidirectional Communication The Schedule data can be read and written by the command on the host computer side. When the electrode is at Start Point, the schedule data can be read or written. When the readout/overwrite command is sent from the host computer, MH-P20B/D20B sends back the data.
  • Page 49 MH-P20B-2□/MH-D20B-2□ ・MH-P20B/D20B→Host Controller Character Item Order Description Range train Communication start 01-01 Fixed (to host) 02-03 Communication ID Fixed 04-06 Schedule No. 001 to 031 07-07 Data start Fixed 00000 to 05000 08-13 nnnnn, Start Point (nnn.nn, unit in mm) 00000 to 05000 14-19 nnnnn,...
  • Page 50 MH-P20B-2□/MH-D20B-2□  Overwrite Command ・Host Controller→MH-P20B/D20B Character Item Order Description Range train Communication start 01-01 Fixed (from host) 02-03 Communication ID Fixed 04-04 Overwrite request Fixed 05-07 Schedule No. 001 to 031 08-08 Data start Fixed 00000 to 05000 09-14 nnnnn, Start Point (nnn.nn, unit in mm)
  • Page 51 MH-P20B-2□/MH-D20B-2□ ・MH-P20B/D20B→Host Controller Character Item Order Description Range train Communication start 01-01 Fixed (to host) 02-03 Communication ID Fixed 04-06 Schedule No. 001 to 031 07-07 Data start Fixed 00000 to 05000 08-13 nnnnn, Start Point (nnn.nn, unit in mm) 00000 to 05000 14-19 nnnnn,...

  • Page 52: Outline Drawings

    MH-P20B-2□/MH-D20B-2□ 11. Outline Drawings (1) MH-P20B-20/-21 Head The separately sold electrode and electrode holder are mounded in the figure below. Dimensions in mm Head mtg.hole: 6-φ6.5 Spot facing: φ11,10mm depth 11. Outline Drawings 11-1...

  • Page 53: Mh-D20B-20 Head

    MH-P20B-2□/MH-D20B-2□ (2) MH-D20B-20 Head Dimensions in mm 218.5 20.5 195.5 11. Outline Drawings 11-2...

  • Page 54: Head Controller

    MH-P20B-2□/MH-D20B-2□ (3) Head Controller Dimensions in mm TR OUB LE S PEE D SC H H OLD TIM E WELD HEA D RE ADY CONT ROL UNI T MI D WE LD OR G HO LD AU TO O R G/ C A N CE L FORCE CHECK PUS H...

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