ENGLISH
6.6 SETTING GRIP PROTECTION Grip protection is an L1 software feature. Grip protection is not available when using either the DFC or DFG force gage. Grip protection allows you to set a maximum load that protects you from accidently overloading your testing fixture. With the grip protection feature, you specify a maximum load. If this load is achieved during a test, the test will abort and the crosshead will stop. NOTE Use the Grip Protection feature within your L1 tablet and software to protect your test fixture for inadvertent overloading.
Using the L1 software, the L1 tablet’s load bar graph and sensor symbol (on the header) will display a color to depict the amount of load being measured by the sensor relative to the sensor’s rated capacity. When the color YELLOW is being displayed, you should use caution. When the color RED is being displayed, you should use extreme caution and be prepared to stop your test. When your sensor is measuring between 0 and 75% of its rated capacity, the bar graph will display GREEN. When your sensor is measuring between 76% and 90% of its rated capacity, the bar graph and sensor symbol will display YELLOW. When your sensor is measuring above 90% of its rated capacity, the bar graph and the sensor symbol will display RED. NOTE • Observe the load bar graph indicator and sensor symbol when performing a test. If the bar graph and sensor symbol display RED, be prepared to stop the test to protect your load cell sensor from an overload condition. • Your L1 software also contains load protection for your load cell sensor. Within the L1 software, all template setups and your Tension and Compression stages, contain CONDITIONAL SETTINGS. Included in these settings is the ability to stop the crosshead when a load limit is reached. It is recommended that you use the Load Condition.
6.7
LOAD CELL PROTECTION
Shown: L1 Software Grip Protection Setup
Load cell protection is an L1 software feature. Load cell protection is not available when using either the DFC or DFG force gage. Mechanical overload protection is standard on both the Starrett DFC and DFG force gages. The gages’ sensors have mechanical overload protection up to 200% of the sensor’s rated capacity. Your BLC load cell sensors have mechanical overload protection. The BLC sensors have mechanical overload protection up to 150% of the sensor’s rated capacity. Within the L1 software in the LOADS Setting, there is a feature called “Maximum Load Allowed”. This feature lets you scale your load cell to help prevent accidental overloading. Refer to the L1 Software Manual for more information on this feature. The DFC and DFG force gages display the active load being placed on the internal load cell. A bargraph on the gage displays in color. When the gage is operating between 1 and 75%, the bar graph is GREEN. When the load is at 76 to 90%, the bar graph is YELLOW. When the measured load exceeds 90%, the bar graph displays in RED. If you apply a load greater than the sensor’s rated full scale, the display will flash RED indicating you should immediately relieve the load being applied to the sensor.
Shown: L1 Software Maximum Load Allowed Load Cell Protection
6.8 STARTING A TEST Before starting a test we recommend the operator perform the following pre-test checks: • Verify that the system is properly installed and all preparation is complete. • You are using a calibrated BLC load cell sensor. • You have properly set the upper and lower crosshead travel limits. • You have set appropriate CONDITIONAL SETTINGS in your L1 tablet for Distance and Load Limits. • Verify that your test setup parameters are set in accordance with your testing requirements. • Your operator has reviewed the manual for the control system and L1 tablet and are familiar with all safety and operating features.
PKG08813-UMFMM 21
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