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7-1

CHAPTER 7: THEORY OF OPERATION

7.1

THEORY OF OPERATION OVERVIEW

Refer to Appendix C for reference designators.

7.1.1 MAIN / ADC BOARD ASSEMBLY

Power to the scale is supplied by a 12 VDC, 500 mA adapter. Regulator U1 supplies
+5 VDC to the digital components. Regulator U8 su 10 VDC to the analog
components including load cell excitation. Switching regulator V5 inverts the + 10
VDC to – 10 VDC to act as the negative supply rail. Regulators V4 and V6 further
regulate to

±

8 VDC for the A/D converter IC, U9.

Op-amp U11 forms a high impedance bridge amplifier for the load cell with a fixed
gain of

100. Op-amp U10:B forms a low pass filter to prevent unwanted noise from

entering the circuit. The other half of U10 (U10:A) provides a buffered reference
voltage for op-amp U11. The A/D converter, U1, is a dual slope type converter.
Timing is controlled by the microcontroller.

Microcontroller U2 executes several functions including A/D fetch, digital signal
conditioning, key scan, serial communication, and display output. EEPROM U5
contains calibration data as well as the setup parameters. IC U7 is the EPROM,
which contains program memory. The network around U4 boosts the MCU’s UART
signal to RS-232 level for serial communication with a host device.

7.1.2 DISPLAY/KEY BOARD ASSEMBLY

This circuit contains footprints for 5 keys, display driver (U4) and the LED Display
(U1-U3).

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Содержание PC 150

Страница 1: ...North American Service Manual MODEL PC SERIES Version 2 March 25 1997 Revision B1 1 April 4 2000 Prepared by TRANSCELL TECHNOLOGY INC ...

Страница 2: ...play Key Board Assembly 7 1 Appendix A Technical Specifications A 1 Appendix B Serial Data Formats Information B 1 B 1 Serial Data Formats B 1 B 1 1 Serial Data Formats Overview B 1 B 1 2 Consolidated Controls Demand Format B 1 B 1 2 1 Recognized Host Commands B 1 B 1 3 Consolidated Controls Continuous Format B 2 B 1 4 Toledo 8213 Demand Format B 3 B 1 4 1 Recognized Host Commands B 3 B 1 5 NCI 38...

Страница 3: ...s Demand Weigh Data Record B 1 B 2 Consolidated Controls Continuous Weigh Data Status Record B 2 B 3 Toledo 8213 Demand Weigh Data Record B 3 B 4 Toledo 8213 Demand Status Record B 3 B 5 NCI 3800 Triner Demand Weigh Data Record B 4 B 6 NCI 3800 Triner Demand Status Record B 4 B 7 NCI 3800 Triner Demand Invalid Command Record B 4 B 8 Transcell Technology Demand Weigh Data Record B 5 B 9 Transcell T...

Страница 4: ...cement should be done by factory authorized personnel only The PC Series has three ranges of weight capacities The PC 30 is a 30 lb 15 kg scale the PC 70 is a 70 lb 30 kg and the PC 150 is a 150 lb 70 kg scale PC 70 MODEL ZERO kg lb GROSS NET TARE PRINT Transcell Technology inc CLASS 1500 max n III CAPACITY 70 x 0 05 lb 30 x 0 02 kg Temp Range 0 to 40 C ZERO TARE NET GROSS STABLE lb kg FIGURE 1 1 ...

Страница 5: ... as follows 1 Referring to Figure 2 1 locate the calibration switch on the back of the scale 2 Replace the calibration switch cover by securing with the two drilled head screws 3 Thread a wire security seal through the openings in both drilled head screws This prevents access to the calibration switch Refer to Figure 2 2 for more detail Calibration Switch Figure 2 1 Location of Calibration Switch ...

Страница 6: ...g In Order Of Appearance Do the Keys Work YES 1 Check Display Cable NO Try The Following In Order Of Appearance 1 Check for proper AC Adapter Voltage Is the Scale Stable YES 2 Check environment NO Try The Following In Order Of Appearance 1 Check for platform obstruction i e ovld stop Is the Scale Linear YES 2 Replace load cell if zero offset count too high CALL TRANSCELL STOP A A 1 Try re calibrat...

Страница 7: ...4 1 CHAPTER 4 ILLUSTRATED PARTS LIST 4 1 PC 30 AND PC 70 1 2 4 3 5 ...

Страница 8: ...d Cell FAD 20 PC 30 2 1 211040045 Load Cell FAD 45 PC 70 3 1 380190036 Bottom Spacer Aluminum 4 1 380190037 Top Spacer Aluminum 5 4 380190013 Adjustable Foot 1 250116237 AC Adapter 12 VDC 500 mA 1 ITEM QTY PART NO DESCRIPTION 1 1 215193811 Main Board Assy 1 215366100 Display Key Board Assy ...

Страница 9: ...4 3 4 2 PC 150 5 6 7 1 3 ...

Страница 10: ... DESCRIPTION 1 1 380190008 Stainless Steel Platform 3 1 380360001 Top Spacer Aluminum 5 1 211040100 Load Cell FAD 100 6 1 380360007 Bottom Spacer Aluminum 7 4 380190013 Adjustable Foot 1 250116237 AC Adapter 12 VDC 500 mA ...

Страница 11: ... scale platter 1 and set aside 2 Using the 5 mm Allen wrench remove the 2 load cell mounting bolts 2 3 Lift off the sub platform assembly 3 and set aside 4 Remove the 4 mounting screws 5 for the splash plate 4 and set aside 5 Lift off the splash plate and set aside 1 3 4 2 5 Figure 5 1 Opening up the PC 30 and PC 70 Base Unit ...

Страница 12: ...e scale platter 1 and set aside 2 Using the 5 mm Allen wrench remove the 2 load cell mounting bolts 2 3 Lift off the sub platform assembly and aluminum spacer 3 and set aside 4 Remove the 4 mounting screws 5 for the splash plate 4 and set aside 5 Lift off the splash plate and set aside ...

Страница 13: ...5 3 1 2 3 4 5 Figure 5 2 Opening up the PC 150 Base Unit ...

Страница 14: ...D SCALE TXD RED BLK RED Setup Switch On Off Switch 1 2 LED RED GRN BLK WHT 1 2 3 4 E S E S J8 2 1 Ferrite Bead Core Ferrite Bead Core J3 1 2 3 4 J2 Female 14 PIN CENTRONICS TO REMOTE DISPLAY KEY UNIT PC 30 1 2 3 4 5 6 7 8 9 10 10 9 8 7 6 5 4 3 2 1 PC 70 ONLY Display Key Board Assy PC 150 only Figure 6 1 PC Series Chassis Wiring Diagram ...

Страница 15: ...a fixed gain of 100 Op amp U10 B forms a low pass filter to prevent unwanted noise from entering the circuit The other half of U10 U10 A provides a buffered reference voltage for op amp U11 The A D converter U1 is a dual slope type converter Timing is controlled by the microcontroller Microcontroller U2 executes several functions including A D fetch digital signal conditioning key scan serial comm...

Страница 16: ...IGITAL SPECIFICATIONS Microcontroller Intel 80C32 Program Memory 32K x 8 external to µC EEPROM 64 x 16 external to µC SERIAL COMMUNICATIONS RS 232 Full Duplex Selectable Baud Data Bits and Parity OPERATOR INTERFACE Display 6 Digit 0 56 7 segment LED Display Keyboard 5 key Tactile Keypad POWER AC Adapter 12 VDC 500mA ENVIRONMENTAL Operating Temperature 41 F 0 C to 95 F 40 C Storage Temperature 4 F ...

Страница 17: ...equired For Continuous types host control is not required but not restricted either In this type the scale automatically transmits a weigh data status record out of the serial port at the end of each display update Continuous types are used to interface to computers scoreboards and other remote devices requiring constant data updating Host commands although not required are accepted and acted upon...

Страница 18: ...ponse from the scale The host must issue a P command to determine if the command was processed by the scale N This command is sent to the scale to revert to net The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or a tare has yet to be established Even if successful the host re...

Страница 19: ...tion Always 1 Always 1 B5 B4 B3 B2 B1 B0 Out of range Motion See Table STATUS BYTE TABLE FIGURE B 4 Toledo 8213 Demand Status Record B 1 4 1 RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and are single ASCII characters W This command is sent to the scale to print the indicated display The scale will respond with the status record if the weight is less than zero or t...

Страница 20: ...le LSB Low Status Byte See Table CR 4 Carriage Return ETX End of Transmission Not Used Bit Function B3 B2 B1 B0 Over capacity Under capacity 1 True Low Status Byte Table 1 True Not Used 1 Insert SP for Triner 2 Insert SP for NCI LB KG 4 Insert LF for NCI Units 3 LB pound KG kilogram 3 Use lower case for NCI FIGURE B 5 NCI 3800 Triner Demand Weigh Data Record LF HSB Line Feed High Status Byte Same ...

Страница 21: ... s front panel If the weigh data is invalid the scale sends the status record shown in Figure B 9 See section below for more information STX XXXX XXX UNITS GR NT CR LF Polarity Positive Negative Weight digits Units lb pound kg kilogram Gross Net GR Gross NT Net Start Transmission Carriage Return Line Feed SP SP Space Space with leading zero suppression ETX End Transmission FIGURE B 8 Transcell Tec...

Страница 22: ...P command to determine if the command was processed by the scale N This command is sent to the scale to revert to net The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it is not in gross mode or a tare has yet to be established Even if successful the host receives no response from the scale The host ...

Страница 23: ...ty SP Positive Negative Weight digits Start Transmission SP SP Space Space with leading zero suppression ETX End Transmission XX X Weight digits OZ SP Status Byte M Motion C Over CHK1 CHK2 Space Checksum Byte 1 Checksum Byte 2 FIGURE B 11 Detecto Weigh Data Status Record B 1 8 1 RECOGNIZED HOST COMMANDS These commands are issued from the host to the scale and are single ASCII characters This comma...

Страница 24: ...he zero reset range Even if successful the host receives no response from the scale The host must issue a CR command to determine if the command was processed by the scale T This command is sent to the scale to tare the scale The scale will disregard this command if the scale is in motion positive overload or negative overload The scale will also disregard this command if it displaying a negative ...

Страница 25: ...command is sent to the scale to toggle among the configured units Even if successful the host receives no response from the scale The host must issue a CR command to determine if the command was processed by the scale ...

Страница 26: ...C 1 APPENDIX C CIRCUIT DIAGRAMS Please see attached schematic diagram sheets ...

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