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Magnetic Instrumentation 942B Instruction Manual

Magnetizer
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INSTRUCTION MANUAL
MODEL 942B
MAGNETIZER
Starting with Serial Number 41807
Created -2013
8431 Castlewood Drive, Indianapolis, IN 46250 USA
(317) 842-7500 • Fax (317) 849-7600
.
E-Mail: maginst@maginst.com • www.maginst.com

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Summary of Contents for Magnetic Instrumentation 942B

  • Page 1 INSTRUCTION MANUAL MODEL 942B MAGNETIZER Starting with Serial Number 41807 Created -2013 8431 Castlewood Drive, Indianapolis, IN 46250 USA (317) 842-7500 • Fax (317) 849-7600 E-Mail: maginst@maginst.com • www.maginst.com...
  • Page 3 IMPORTANT THE FIXTURE MUST BE CONNECTED BEFORE TURNING ON THE MAGNETIZER. THE MAGNETIZER WILL NOT FUNCTION UNLESS A FIXTURE IS PROPERLY CONNECTED. BEFORE FIRST USE, INSPECT THE MACHINE AND MAGNETIZING FIXTURE CAREFULLY FOR ANY SIGNS OF SHIPPING DAMAGE. IF DAMAGE IS EVIDENT NOTIFY THE CARRIER AND MAGNETIC INSTRUMENTATION, INC.
  • Page 4 Failure to comply with these precautions, or with specific warnings elsewhere in this manual, violates safety standards of design, manufacture, and intended use of this product. Magnetic Instrumentation, Inc. assumes no liability for failure to comply with these requirements.
  • Page 5 DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present. DO NOT SUBSTITUTE PARTS OR MODIFY EQUIPMENT Because of the danger of introducing additional hazards, do not install substitute parts or perform an unauthorized modification to the equipment.

  • Page 6: Table Of Contents

    TABLE OF CONTENTS GENERAL DESCRIPTION Optional Accessories Safety Procedures ELECTRONICS CABINET Specifications Control Panel Components Magnetizing Fixture and Connections III. SET UP INSTRUCTIONS BASIC MAGNETIZER CIRCUIT DESCRIPTION Capacitor Charging Circuit Discharge Circuit Current Bias Supply Safety Drain Circuit CIRCUIT BOARD DESCRIPTIONS General Description of Charge Control Board # 10420270 Technical Description of Charge Control Board # 10420270 General Description Power Supply and Relay Board # 10401433...
  • Page 7 Technical Description of Parallel SCR Driver Board # 10412049 SERVICE AND MAINTENANCE General Instructions Test Equipment Panel Removal Adjustments Trouble Shooting VII. REPLACEMENT PARTS...

  • Page 8: General Description

    I. GENERAL DESCRIPTION The Model 942B is a high voltage, capacitive discharge-type magnetizer capable of saturating all alnico, ferrite, and rare earth magnetic materials. The Model 942B is easily adapted to a wide variety of production and laboratory magnetizing requirements.

  • Page 9: Optional Accessories

    Magnetic Instrumentation, Inc. Care should be taken that the equipment is properly grounded. No drilling, tapping, or machine work should be done on the Magnetizing Fixture housing unless drawings of the internal construction are first obtained from Magnetic Instrumentation, Inc.

  • Page 10: Electronics Cabinet

    II. ELECTRONICS CABINET A. Specifications Power Source 115 or 230 Volts, 50/60 cycles. 15 Amperes maximum. Storage Capacitors 200, 400, 600, or 800F, as ordered. Up to 800F may be installed in the cabinet on initial order, or later as required. Output Voltage 100 Volts to 3,000 Volts (set by user) Watt-Second Ratings (Joules)
  • Page 11 Voltage Control This 10 turn potentiometer is used to control the voltage to which the energy storage capacitor bank is charged. Voltage may be increased by turning the knob clockwise. Voltage may be decreased by turning off the power-on switch (circuit breaker) or by initiating the Magnetize function, thereby discharging the capacitor bank through the fixture.

  • Page 12: Magnetizing Fixture And Connections

    Magnetizing Fixtures are available from Magnetic Instrumentation, Inc. for use with the Model 942B Magnetizer. Be sure to follow the suggested operating parameters for each fixture. Failure to do so may lead to premature failure of the Magnetizer and /or the Magnetizing Fixture.

  • Page 13: Set Up Instructions

    III. SET UP INSTRUCTIONS The following procedure verifies proper operation of the machine. 1. Place the electronics cabinet and Magnetizing Fixture in their final operating location. 2. Connect water source to the Magnetizing Fixture, if required. 3. Connect the Magnetizing Fixture to the electronics cabinet. 4.

  • Page 14: Basic Magnetizer Circuit Description

    Block diagram of the Model 942B Magnetizer Note: All of the major components’ circuit designations in the following section of this manual are in bold and correspond to the Electrical Schematics sheet 4 and 5 of the drawing set.

  • Page 15: Discharge Circuit

    B. Discharge Circuit The discharge circuit, which provides the magnetizing current, consists of an electrically matched Parallel SCR Assembly (1SCR), Parallel SCR Driver Board (4PCB), Reverse Current Blocking Diode Assembly (1DDP), and the Magnetizing Fixture. Provided the Capacitor Bank is charged to the preset voltage level and the Magnetize function has been initiated, the Control Circuitry sends a logic signal to the Parallel SCR Driver Board.

  • Page 16: Circuit Board Descriptions

    V. Circuit Board Descriptions The following technical descriptions are for the circuit boards located within the Magnetizer. See the schematics for complete details. A. General Description of Charge Control Board # 10427655 This board controls the charging, discharging, and timing of the machine. The charging circuit uses a comparator IC, and Transistor Logic to control an externally mounted Solid State Relay.
  • Page 17 The collector of Q308 feeds two circuits: 1. Q307 inverts the logic level on the collector of Q308. The collector of Q307 is used to drive Q303 that makes up half of the two transistor “AND” circuit that enables a magnetize condition.

  • Page 18: General Description Power Supply And Relay Board # 10401433

    Timing sequence: Provided the timers are enabled, (Pin 10 of header connector at +15V), a low (Ov) applied to Pin 19 of header connector turns off Q301 allowing C303 to discharge. This starts timers IC301 and IC 302. IC301 turns on Q304 disabling the charge circuit through Q310, and maintains the low at Pin 12 of header connector.

  • Page 19: Technical Description Of ± 15Vdc/ ± 24Vdc Power Supply # 10401415

    E. Technical Description of ± 15VDC/ ± 24VDC Power Supply # 10401415 The power supplied to this board must be provided by an externally mounted transformer connected to Pins 5 and 6, center tap to Pin 7 or 8, of header connector. This transformer should provide 18 VAC between Pins 5 and 7 or 8, and 18 VAC between Pins 6 and 7 or 8, 36 VAC should be seen between Pins 5 and 6.
  • Page 20 The contacts of CR202 are as follows: Header Connector Contact Pin Number Configuration Normally Open (N.O.) Common (C.) (shared by Pins 7 & 8) Normally Closed (N.C.) N.O. C. (shared by Pins 6 & 9) N.C. N.O. C. (shared by Pins 13 & 10) N.C.

  • Page 21: Description Of 3000 / 300 Divider Board # 10407715

    LEDs that indicate the gate drive signal has been supplied to the gates of the SCRs. This board also has an isolated voltage divider that is not used in the 942B. Technical Description of Parallel SCR Driver Board # 10412049 This board contains two identical driver circuits and two identical negative bias circuits.
  • Page 22 Start Input Circuit The start circuit input on this board requires an external 10 VDC to 15 VDC power supply. The positive of this supply is connected to 2CN terminal 1 and the negative of the supply is connected to 2CN terminal 3. This supply powers two open-collector NAND gates and two opto-couplers.

  • Page 23: Service And Maintenance

    ONLY if absolutely required for repair. A. General Instructions The Model 942B Magnetizer is a combination of electrical and electronic components. Procedures consistent with safety and standard practices for each area should be used. Regular service should be performed to insure proper connection of all terminals.

  • Page 24: Panel Removal

    C. Panel Removal Panels should be removed only by trained personnel. Care must be used when removing panels. Panels should be removed only with equipment disconnected from the AC line. Always check the Capacitor Bank voltage prior to beginning any repair. If the voltage is not zero, discharge the capacitors in a safe and proper manner before proceeding.
  • Page 25 NOTES:...

  • Page 26: Replacement Parts

    VII. REPLACEMENT PARTS DESCRIPTION AND CIRCUIT DESIGNATION STOCK CONTROL PANEL PARTS NUMBER POWER ON CIRCUIT BREAKER 15A/240V CIRCUIT BREAKER 2 POLE 57900646 CONTROL POWER FUSE .500 AMP 250V SB 3AG 57602609 POWER ON LIGHT 120V 25mA 3W 58700656 ANALOG PANEL METER 0-3000 VDC (1MA FS) 59106037 VOLTAGE CONTROL POTENTIOMETER...
  • Page 27 250V 10A 2 WIRE RECP. CABLE MOUNT 62906245 NOTE: All parts for the Model 942B are available from Magnetic Instrumentation Inc. If a part that is not listed or trouble-shooting assistance is required contact the service department at 317-842-7500 or email maginst@maginst.com.

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