HP Indigo W7250 Strain Gauge Second Transfer Measurement Service and Troublesh
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- HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 1
describe how to service and troubleshoot the second transfer measurement strain gauget HP Indigo WS6000 Digital Press, HP Indigo WS6000p Digital Press, HP Indigo WS6600 Digital Press, HP Indigo WS6800 Digital Press, HP Indigo W7200 Digital Press, HP Indigo W7250 Digital Press. Document number CA393 - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 2
Table of contents 1 Overview ...1 2 Introduction...2 General...2 Principles of Operation...4 Troubleshooting ...11 Appendix A Revision history and confidentiality notice ...13 Revision history...13 Confidentiality notice...13 ii - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 3
1 Overview This document describes service and troubleshooting for the second transfer measurement strain gauge. Overview 1 - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 4
2 Introduction Introduction to Strain Gauge Service and Troubleshooting. General The strain gauge system is an automated system that controls and measures the second transfer force between the impression drum and ITM drum. 2 Chapter 2 Introduction - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 5
Figure 2-1 Strain Gauge Mechanism 1 Emerson servo-motor 2 Impression drum 3 Tapered bearing based shaft 4 Pivoting arms and impression drum holder 5 SMC compact cylinders 6 Quick release latches 7 Main shaft 8 Bearings housings and motion transfer member 9 Strain gauge 10 Gap adjusting stoppers 11 - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 6
Principles of Operation The resistance change, usually measured using a Wheatstone bridge, is related to the strain by the quantity known as the gauge factor By using a Wheatstone bridge, it is possible to compensate for temperature changes The measured voltage is proportional to the strain, and - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 7
The following diagrams shows what might happen if a strip of metal were fitted with four gauges: see the values change as the forces/positions change: Figure 2-3 Wheatstone bridge force diagram at different positions Signal flow The following figure shows the signal flow between the electrical - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 8
Figure 2-4 General Electronics - Signal flow diagram Open loop second transfer pressure control Two strain gages are connected to the front and the rear of the impression. The strain gages are wired into the IP and Feed drive (U15 & U17) analog input 7 and 3. Figure 2-5 Electrical Diagram - Rear - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 9
Figure 2-6 Electrical Diagram - Front Strain Gauge Figure 2-7 Strain Gauge - Electronic Control Card Figure 2-8 Strain Gauge - Connection Diagram Principles of Operation 7 - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 10
Figure 2-9 Strain Gauge - Interconnection Diagram The communication path is shown below Figure 2-10 Communication path There are two measurement modes: ● Average force at the end of each print cycle (Only during print). ● Continuous measurement (in all states). Average on the measurement window ( - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 11
Figure 2-11 Value on arm Typical measurement output from one of the two strain gauges is shown below. Figure 2-12 Measurement output Related Systab parameters Direction MCN>PLC MCN>PLC PLC>MCN PLC>MCN MCN>PLC MCN>PLC Systab WHS_W_Host_To_PLC:SecoundTransferMesurmentEnable = 0 WHS_W_Host_To_PLC: - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 12
For example, the value 64.43 should replace the default value in the Systab to 6443 PrintCare wizard The 2nd transfer wizard is accessed through the PrC: Maintenance > Component calibration > Web Impression engage system. There are two wizards: ● Automatic: Second transfer strain gauge adjustment - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 13
Troubleshooting Troubleshoot the second transfer measurement strain gauget. Zero reading in 2nd Transfer Wizard In case of "0" reading at the 2nd transfer wizard, check of 2nd transfer can happen if the torque bushings open. The torque should be 25 nm Figure 2-15 Torque bushings Troubleshooting 11 - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 14
Figure 2-16 Torque bushing - Danger zones Changing the strain gauge Systab values Follow these steps to change the strain gauge systab values. Details for inserting the Arm calibration values in Systab: 1. Upload arms parameter (A) into the Systab. ● WHS_W_Configuration: 2ndtrsf_Newton_per_10V_Front - HP Indigo W7250 | Strain Gauge Second Transfer Measurement Service and Troublesh - Page 15
, printing instructions, and a notice of document confidentiality. Revision history Below is the history of the document revisions and a list of authors. Revision CA393-07540 Rev 00 CA393-07540 Rev 01 Description Initial document Added to scope: HP Indigo WS6800 Digital Press Responsible
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Strain Gauge (Second Transfer Measurement)
Service and Troubleshooting
Document details
Purpose
To describe how to service and troubleshoot the second transfer measurement strain gauget
Scope
HP Indigo WS6000 Digital Press, HP Indigo WS6000p Digital Press,
HP Indigo WS6600 Digital Press, HP Indigo WS6800 Digital Press,
HP Indigo W7200 Digital Press, HP Indigo W7250 Digital Press.
Document number
CA393-07540
Revision number
01
Date
17 July 2014
Security level
HP Confidential
The information contained in this document is accurate at the date of release.
Check CE Suitcase for the most recent version of this document.
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