A:
Answer
1.Q: Special operation and the analog calibration method of GM8804C-3:
A: Press the below combination key to enter into a hidden interface when the indicator display “8804c3” after power up and flash “8” three times.
(Note: The below combination keys must be finished as sequence during the indicator display “8804c3”.)
Initialization:
Combination key: set+setup1+cal2
The interface shows “Pr_g_n”, press "G/N", shows “Pr-Ent”, re-press "G/N", enter password “880432”, and resume the follow content:
ALL-- Resume all parameters
CAL—Resume calibration parameters
IO—Resume defining I/O
UART—Resume serial port
FACTOR—Resume operation parameters
USER—Resume user parameters
AI—Resume Analog Input calibration
AO—Resume Analog Output calibration
Press enter and it would display “Finish” when enter into the interface need to resume, then quit the resume interface automatically.
Analog input mode selection and calibration:
Combination key: set+setup1+date5
(Warning: this function must be turn off if no need analog input)
Press "TARE" to choose the mode you need when the display shows “OFF” after enter into the interface, which offers modes to choose from—including “OFF”、”A 4-20(mA)”、”A 0-20(mA)”、”U 0-10(V)” & “U 1-5(V)”, then press "ENTER" to enter into the Input Calibration Interface.
When the sub-display displays “Lo”, which represents “4mA”, the main display is the current DA code, connecting 4mA to the input port and pressing "ENTER" after the readings being stable;
When the sub-display displays “HA”, which represents “12mA”, the main display is the current DA code, connecting 12mA to the input port and pressing "ENTER" after the readings being stable;
When the sub-display displays “HA”, which represents “12mA”, the main display is the current DA code, connecting 12mA to the input port and pressing "ENTER" after the readings being stable;
When the sub-display displays “Hi”, which represents “20mA”, the main display is the current DA code, connecting 20mA to the input port and pressing "ENTER" after the readings being stable;
When the sub-display displays “TET”, which represents testing interface, connecting any seize current to the testing analog input port, if the current value of the actual input was as same as the value of the main display, which means the input calibration was correct; if not, need re-calibration.
Press "ESC" to quit after the calibration ends.
Main Analog output mode selection and calibration:
Combination key: set+setup1+sum6
Press "TARE" to choose the mode you need when the display shows “OFF” after enter into the interface, which offers modes to choose from—including “OFF”、”A 4-20(mA)”、”A 0-20(mA)”、”U 0-5(V)””U 0-10(V)” & “U 1-5(V)”, then press "ENTER" to enter into the Input Calibration Interface.
When the sub-display displays “Lo”, which represents “4mA”, the main display is the current DA code, adjust the DA code ("TARE":fine adjustment; "ENTER": value input),when the testing value between AO1+ and AO1- was 4mA, press "ENTER" to enter into the 12mA calibration interface;
When the sub-display displays “HA”, which represents “12mA”, the main display is the current DA code, adjust the DA code ("TARE": fine adjustment; "ENTER":value input),when the testing value between AO1+ and AO1- was 12mA, press "ENTER" to enter into the 20mA calibration interface;
When the sub-display displays “Hi”, which represents “20mA”, the main display is the current DA code, adjust the DA code ("TARE": fine adjustment; "ENTER": value input),when the testing value between AO1+ and AO1- was 20mA, press "ENTER" to confirm.
Press "ESC" to quit after the calibration ends.
Deputy Analog output mode selection and calibration:
Combination key: set+setup1+print7
The calibration method was as same as above.
High-speed serial port (GM Mode) mode selection:
Combination key: set+setup1+test8
This mode was OFF by default.
OFF: Modbus Communication. Set up the communication method within the operating parameter.
ON: Sending data in GM format; Baud rate: 57600; Communication method: 8N1 (8 data bits, 1 stop bit, no checking); No need parameter adjustment.
Press "ENTER" to confirm after choosing the right mode and then quit to the Startup interface automatically.
2.Q: The GM8804C-3 indicator cannot start.
A: Below are the possible problems:
1.Check the value setting of U1.1 & F5.5 was correct or not. If no value was setting for U1.1 & F5.5, the indicator cannot start, the follows was the setting details;
2.Check the value setting of U1.7 was 0 or not. (U 1.7 was 0, means output flow was 0.)
3.Check whether the ready signal was defined. When the ready signal was defined, the indicator could start only when the ready signal was valid. Then check if the I/O connecting wires were correct.
4.Check the Quantitative working mode U2 was ON or OFF, when the U2 was ON, as the indicator would determine whether the value could meet the setting value of U2.3, zero the accumulation in the stop state. If the setting of U2.3 was unreasonable or the accumulation was too large, the indicator would stop immediately as start it. Zero accumulation method: Press "TARE" to check the accumulation value when the “TARE” light up, then press "ZERO".
5.Check the status indicator of front panel and judge if the current mode belongs to the state could not start, as the status indicator can reflect the indicator work status.
6.Reboot the indicator.
7.Reset the indicator.(Press "SET" + "SETUP" + "CAL" when the digital “8” was flash and choose “ALL” to confirm)
Setting method of U1.1 & F5.5:
1.Adjust the output test percentage of F1.9 to 100, and then start the indicator, in this status the analog output was in a full range.
2.Record the flow data after it become stable, set the record as the value of F5.5, at the same time adjust the F1.9 to 0.
3.Input the target flow of U1.1.(U1.1 is the target flow value of user need)
3.Q: The flow rate of GM8804C-3 was not stable.
A: The possible reasons:
1.Let the scale blank run and check whether the weighing measurement was changing or not.
The blank run of scale:
1. Seperate the materials and the mix cage with some tools.
2. Run the machine.
3. Press "TARE" till the “GROSS” indicators light up, the display reading was the weight. As the materials and the mix cage were separated, no materials would flow out and the weight would not change in theory, but if the weight would change, which means the mechanical structures need to be improved.
2.Check if there was mechanical vibration when the flow rate was fluctuating (such as the filling moment), for this situation, only change the mechanical structure of scale。
3.Check whether the materials were easy to stick powder, these materials would stick together and fall as some blocks during filling, which cause the flow rate fluctuates a lot. Solution: make the massive spread out with some tools.
4.Increases the levels of filtering of F1.4 & F1.5.
5.Increase the sampling time of F2.5.
4.Q: Notice for Analog output calibration of GM8804C-3 indicator.
A: As to the analog output calibration, need do some test to make sure the analog output be correct after calibration according to the general calibration methods. (The follows was an example of 4—20 mA analog output):
1.Test the output of main analog: set the F1.4 as 50, 100, respectively. Then test the corresponding current value of analog output port, if the test value was around 12mv, 20mv, which means calibration analog output was correct.
2.Test the output of sub-analog if the indicator was equipped with a sub-analog output.
1)Switch the sub-analog output to the main analog output. Procedures: When the indicator power up to flash “8” and press "SET" for 3 times till the display displays “FLUFIL”, Press "ENTER", the main display shows “10” and the sub-display shows”FF1”, then press "G/N" till the sub-display shows “CdA ” and choose “ON” of the main display through pressing "TARE". Finally press "ENTER" to save it and then quit.
2)Process as the test output of main analog.
3.Switch the sub-analog output to the main analog output to do the sub-analog output test. Choose “OFF” as the step”1)” after finishing the test.
Notice: if the output of analog were 0~20mA/0~5v/1~5v/0~10v, the corresponding value of analog output were 10 mA/20 mA、2.5v/5v、3v/ 5v、5v/10 when the F1.4 was setting as 50 & 100, respectively.