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MACC MANUAL

PROCESS ELECTRONICS CORPORATION

100 BRICKYARD ROAD

MOUNT HOLLY, NORTH CAROLINA 28120

TELEPHONE (800) 421-9107

FAX (704) 827-9595

[email protected]

WWW.PECRECTIFIER.COM

SOLID STATE CONVERTER

Summary of Contents for MACC

Page 1: ...ACC MANUAL PROCESS ELECTRONICS CORPORATION 100 BRICKYARD ROAD MOUNT HOLLY NORTH CAROLINA 28120 TELEPHONE 800 421 9107 FAX 704 827 9595 SALES PECRECTIFIER COM WWW PECRECTIFIER COM SOLID STATE CONVERTER...

Page 2: ...ATION 11 3 1 Component Operation 11 3 1 1 Magnetic Starter 11 3 1 2 Line Current Transformers 11 3 1 3 Silicon Controlled Rectifier 12 3 1 4 Main Transformer 13 3 1 5 Diode Assembly 14 3 1 6 Control T...

Page 3: ...T PARTS 25 5 1 Parts List 25 It must be understood that these instructions cannot cover all details or variations on equipment nor provide for every possible contingency in connection with installatio...

Page 4: ...f silicon diodes as the rectifying elements See Figure 1 The primary of the main transformer is connected in a solid delta with the SCR s connected in inverse parallel sets in the line The secondary c...

Page 5: ...one by removing the front and rear The panels can be taken off by loosening and removing the retaining screws and lifting the panels swinging the lower portion over the bottom retainer All connections...

Page 6: ...its operating life Normal precautions should be taken to protect the unit from corrosive conditions and improper ventilation Sufficient clearance 12 minimum must be allowed at the front rear and sides...

Page 7: ...7 Figure 4 A Cabinet Size for 500 to 1000 Volt Output Model Figure 4 B Cabinet Size for 1500 Volt Output Model...

Page 8: ...ly If the supply voltage or frequency differ from the rated input voltage or frequency the PEC office should be contacted to advise the necessary changes before the unit can be operated The converter...

Page 9: ...ontrolled units are mounted in a Nema 12 enclosure The enclosure should be mounted close to the operator s normal position Connections from the converter are made to a terminal strip mounted on sub pa...

Page 10: ...10 CAUTION The input wiring and installation should conform to the National Electrical Code and or local codes as required Figure 8 Remote Control Converter Interconnection...

Page 11: ...magnetic coil A normally open contact on the main starter or contactor is used to apply power to the magnetic coil holding the power contacts in until the coil is de energized and the power contacts o...

Page 12: ...e end of that half cycle Holding current is the current necessary to keep the SCR latched in conduction When the SCR stops conducting it returns to the blocking state and will not turn again until the...

Page 13: ...trolling gate cathode pulses for varying the converter output and DV DT protection for the SCR from line voltage transients 3 1 4 Main Transformer The main transformer converts the high voltage low cu...

Page 14: ...line voltage to 110 Volts for use in the control circuit 3 1 7 Protective Devices These devices provide protection for the converter A Main Line Overload A thermal type relay which opens when excessi...

Page 15: ...proper operation of the converter 3 2 1 Control Operation A AC1 Control Board Continuously monitors the current transformer 1 2 3 CT output while the converter is operating In the event of an external...

Page 16: ...area is increased even though the plating voltage is held constant It is necessary to increase the voltage as work area is added in order to maintain the proper average current density The automatic a...

Page 17: ...in the voltage mode of control unless otherwise specified at time of order A The current density adjust pot must be turned completely counterclockwise for automatic voltage operation This pot is loca...

Page 18: ...the current density adjust knob clockwise until the proper current is reached 9 Repeat steps 6 7 and 8 to minimize the current difference from small to larger loads 10 Replace and tighten locknut on c...

Page 19: ...1 and No 20 on the terminal strip See Figure 17 3 Remove wire No 21 from Terminal No 21 and wire No 20 from terminal No 20 4 Connect wire No 21 to Terminal No 20 and wire No 20 to Terminal No 21 See F...

Page 20: ...onnections periodically for loose connections tighten if necessary 4 4 Control Checkpoints The control terminal strip provides a checkpoint on the proper operation of the converter and control board S...

Page 21: ...alled with a torque wrench See Table 4 for values A Method of Checking Diodes Any good quality ohmmeter can be used to check if a diode is open or short circuited The diode to be checked must be remov...

Page 22: ...tud of SCR1 and remove The light should come on and in many cases stay on If the light comes on the SCR is good 6 Reverse the leads as noted below in order to test SCR2 See Figure 22 NOTE No light sho...

Page 23: ...Parts See Section 5 E Oscilloscope CAUTION There are dangerously high voltages present within the power supply enclosure The SCR assembly has up to 480 Volts present on the heat sink Extreme caution s...

Page 24: ...put Converter shuts off intermittently 1 Loose connections in holding circuit 2 Operating unit over rated output Converter Output No output 1 Meter connections loose or broken 2 Defective meter s 3 3T...

Page 25: ...ontrol Transformer 115 25 Volt stepdown AR 48122 Control Switch Toggle 15 W AR 40244 Current Transformer 1 2 3 CT small BR 40309 Potentiometer 1 P AR 40623 Potentiometer 2 3 P AR 40336 Power Diode CR...

Page 26: ...26...

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