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THE MODEL 242L DC ISOLATOR UNIT IS DESIGNED AND MANUFACTURED IN THE USA BY 

EBERLE DESIGN INC., PHOENIX, ARIZONA, AN ISO 9001:2015 REGISTERED COMPANY. 

U.S. PATENT NO. 7,855,893  

© COPYRIGHT 2015 EDI 

 

SERIAL NUMBER:  1506XXXXX and up 

PCB Issue A, 110-0244-001 

REVISION: JUNE 2015 

pn 888-2420-001 

 
 

 

 

 

STATE OF CALIFORNIA 

MODEL 242L 

  

DC ISOLATOR UNIT 

OPERATIONS MANUAL 

 

Summary of Contents for 242L

Page 1: ... BY EBERLE DESIGN INC PHOENIX ARIZONA AN ISO 9001 2015 REGISTERED COMPANY U S PATENT NO 7 855 893 COPYRIGHT 2015 EDI SERIAL NUMBER 1506XXXXX and up PCB Issue A 110 0244 001 REVISION JUNE 2015 pn 888 2420 001 STATE OF CALIFORNIA MODEL 242L DC ISOLATOR UNIT OPERATIONS MANUAL ...

Page 2: ...2 1 5 1 System Description 2 1 5 2 Input Circuit 3 1 5 3 MCU Circuit 3 1 5 4 Output Circuit 3 1 5 5 Display and Switch Circuit 3 1 5 6 Power Supply Circuit 3 1 6 Maintenance 3 1 6 1 Trouble Analysis 3 1 6 2 Trouble Shooting Sequence 4 1 7 Specifications 4 1 7 1 Construction 4 1 7 2 Mechanical 4 1 7 3 Environmental 4 1 7 4 Electrical 4 1 7 5 Timing 5 1 7 6 Connections 5 1 8 Parts List and Schematic...

Page 3: ...standard input file The isolator unit card incorporates a double sided 44 pin edge connector for the connection of power input and output signals Each channel has individual front panel controls for testing the operational mode and high intensity front panel LEDs which are used to indicate the output state Outputs are optically isolated solid state transistors The Model 242L is powered from the 24...

Page 4: ...he input polarity of Channel 2 can be set to invert by installing a jumper into the CH2 POL J4 C 1 5 THEORY OF OPERATION Reference designators shown are for Channel 1 Reference designators for Channel 2 are shown in parenthesis 1 5 1 SYSTEM DESCRIPTION The sensor circuitry can be broken down into seven major blocks Each Input Circuit block contains the electrical transient devices and the input bi...

Page 5: ...ND SWITCH CIRCUIT The LED indicator DS1 DS3 for the channel output is driven directly from the microcontroller U20 The input TEST switch SW1 SW3 can be used to force the input state to the active status 1 5 6 POWER SUPPLY CIRCUIT The main power supply is a fully isolated switching design The cabinet 24VDC input voltage is used to drive switching controller U18 The transformer T1 is used by control...

Page 6: ...ransformer T1 CR30 reference U25 or opto coupler U21 b Regulated Power Supply VDD Voltage at test point VDD should be 5 0 2 Vdc with respect to GND Possible component faults are voltage regulator U26 inductor L2 diode CR29 c Microcontroller Possible components at fault are microcontroller U20 d Output Circuit Output signals are processed by the microcontroller U20 and appear at U20 10 U20 9 and on...

Page 7: ...um Current 50 mA Collector Voltage Maximum 50 Vdc 1 7 5 TIMING Input Pulse Width Reject less than 5 ms Input Pulse Width Accept greater than 10 ms 1 7 6 CONNECTIONS Edge Connector mates with connector type Cinch 50 44A 30 PIN FUNCTION A Logic Ground B DC Supply D Input CH 1 E Input CH 1 Common F CH 1 Output Collector H CH 1 Output Emitter J Input CH 2 K Input CH 2 Common L Equipment Ground W CH 2 ...

Page 8: ...1 8W 5 90K 1 1206 surface mount R94 15 251 8061 S 1 RESISTOR 1 8W 8 06K 1 1206 surface mount R91 16 255 0000 S 6 RESISTOR 1 8W 0 OHMS 5 1206 surface mount E3 4 R42 43 R52 R55 17 255 1020 S 3 RESISTOR 1 8W 1K 5 1206 surface mount R61 62 R88 18 255 4310 S 1 RESISTOR 1 8W 430 Ohm 5 1206 surface mount R87 19 255 4720 S 9 RESISTOR 1 8W 4 7K 5 1206 surface mount R45 46 R54 R56 R72 R77 R79 R83 R86 20 255...

Page 9: ... 0150 RS 2 LED RED WC LENS 1206 FLAT SMT DS1 DS3 LITEON LTST C150KRKT 38 430 0006 S 2 TRANSISTOR MMBTA06LT1 NPN 80V 500 mA SOT 23 Q7 8 39 440 0431 S 1 REGULATOR TL431AID VOLTAGE REF 1 SO8 U25 MOTOROLA 40 440 1002 S 2 GAS DISCHARGE TUBE CR2 3 LITTLEFUSE SL1002A090SM 41 445 3463 S 2 IC AZ34063U PWR SUPPLY CNTLR U18 U26 DIODES INC AZ34063UMTR G1 42 485 1512 S 1 IC PIC16F1512 I SO RISC MPU U20 MICROCH...

Page 10: ...Model 242L Operations Manual Eberle Design Inc Page 8 ...

Page 11: ...Model 242L Operations Manual Eberle Design Inc Page 9 ...

Page 12: ...Model 242L Operations Manual Eberle Design Inc Page 10 ...

Page 13: ...Model 242L Operations Manual Eberle Design Inc Page 11 ...

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