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OilGear EPC 300 Series Скачать руководство пользователя страница 45

EPC

SERVO AMPLIFIER MODULE

Part Number L723888-3xx

ELECTRONIC

Telephone: (231) 929-1660

Oilgear

Fax:

(231) 929-7879

1424 International Dr

Issued May 31, 2018

Web Site:

www.oilgear.com

Traverse City, MI USA 4 9 6 8 6

Bulletin 836260F

45

Example 1

: Balance an LVDT for a bi-directional pump (The example can be followed from

the Example 1 sheet of the Excel template.)

Toggling with the initial values produces a low reading of -92.50% and a high reading of -
40.60%.  These readings should be offset to produce a low reading of -25.95% and a high
reading of +25.95%.  This is calculated by finding the midpoint of the current readings (-90.50
+ -40.60)/2 = -66.55 and comparing that to the desired midpoint (a bi-directional pump should
have a midpoint at 0).  Adding 65.55 to each value results in -90.50 + 65.55 = -25.92 and -
40.60 + 66.55 = 25.95.  This setting is reached when the Balance is set to 411 (low and high
readings of 25.90 and 26.20, respectively).  Notice that at this point approximate values are
good enough.

The user then attempts to adjust the gain to near saturation. At a Course gain = 30 the low
reading is -91.60% while the high reading is -9.20%. The next gain (31) actually saturates the
low reading to -100%, so 30 is used.

The user then attempts to offset the readings to low=-41.20% and high=+41.20%. The user
finds this at Offset=334.

In a similar fashion, the user continues alternately selecting offset and course gain values. At
step 6, a change in course gain saturates the low reading, so the user has successfully found the
optimal setting for course gain. The user continues as before, but this time uses the fine gain to
set the near saturation gains.

At step seven the user finds that a fine gain change from 5 to 6 saturates both readings.
LVDT configuration is complete.

Example 2

: Balance an LVDT for a unit-directional pump. The only difference between this

and the previous example would be that the midpoint would be +50% rather than 0%. The user
is invited to view the Example 2 sheet of the Excel template for this example.

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Содержание EPC 300 Series

Страница 1: ...art Number L723888 3xx ELECTRONIC Telephone 231 929 1660 Oilgear Fax 231 929 7879 1424 International Dr Issued May 31 2018 Web Site www oilgear com Traverse City MI USA 4 9 6 8 6 Bulletin 836260F 1 EP...

Страница 2: ...4 1 2 6 Static Function Selection with Watchdog Monitor 8 4 1 2 7 Static Function Selection with Watchdog Daisy Chain 9 4 1 2 8 Static Function Selection with Limit Monitor 9 4 1 3 Program Block Conf...

Страница 3: ...g LVDT Configuration Range 43 4 4 5 2 Adjustment Algorithm 44 4 5 Advanced Configuration 46 4 5 1 Horsepower Limit Factor Calculation 46 4 5 1 1 Experimental HP Limit Factor 47 4 5 1 2 Theoretical HP...

Страница 4: ...h both stroke position and pressure feedback In addition two 2 independent function programs can be dynamically selected with a digital input signal The unit provides a digital output for simple diagn...

Страница 5: ...ogrammable parameters Please refer to Section 4 1 1 for a thorough discussion of Password Protection 3 2 PC Interface Groupings The PC interface provides a programming and monitoring interface A toolb...

Страница 6: ...modify any entry in this mode 4 1 2 Operating Modes 200 Program Item Range Description 200 0 to 7 Operating Mode 0 Dynamic Function Selection with Fault Monitor 1 Dynamic Function Selection with Watc...

Страница 7: ...choosing Mode 1 Dynamic Function Selection with Watchdog Monitor from the General Configuration Form of the PC Interface In this operating mode the digital input selects which program block is active...

Страница 8: ...ondition is taking place the digital output will be low 0 VDC If no limiting situation is taking place the digital output will be high Vsupply If the Horsepower limiter is disabled and a program other...

Страница 9: ...uld be configured for Mode 2 Any module failure would break the daisy chain 4 1 2 8 Static Function Selection with Limit Monitor This operating mode is selected by setting menu item 200 to 7 by choosi...

Страница 10: ...he program block configuration parameters are used in conjunction with the module operating modes to assign pre defined programs to the two 2 program blocks Dynamic Operating Modes These modes are ref...

Страница 11: ...Control and Program Selection for Program Block 2 program item 211 is set to 0 No Program If the digital input is low 5 VDC Program Block 1 is made active and the active program is Program 1 Pressure...

Страница 12: ...h Pressure Limit Control programs Programs 5 and 6 provide Load Sense Control programs Programs 7 and 8 provide Simple Flow Control programs Programs 9 and 10 provide Pressure Control with Flow Preset...

Страница 13: ...alent to a 0VDC input signal and 100 being equivalent to a 10VDC signal Pressure Command Source The Pressure Command Source selects the source of the pressure command for the program Valid entries are...

Страница 14: ...ons to the program output Figure 4 Pressure Control Program Example Figure 4 shows the Program 1 Form for Pressure Control The Pressure Command Source is Analog Input 1 program item 401 1 and the Pres...

Страница 15: ...t Source Table 5 Flow with Pressure Limit Programs Function Programs 3 and 4 provide for Flow with Pressure Limit Control Program 3 is configured in program items 420 through 429 in the Program 3 Form...

Страница 16: ...ommand If the Pressure Breakpoint Source is set to 6 Limit Offset the preset is configured as a percentage with 0 equivalent to a 0VDC input signal and 100 equivalent to a 10VDC offset signal The offs...

Страница 17: ...eedback Source is Analog Input 2 program item 424 2 The Pressure Breakpoint Source is Limit Offset program item 429 6 The Pressure Breakpoint Preset is set to 10 program item 428 10 The Pressure Break...

Страница 18: ...Program 6 Pressure Limit Source 456 1 to 5 Program 6 Pressure Point 1 Source 457 0 to 1 Program 6 Program Output Destination 458 0 to 100 Program 6 KP 459 0 to 100 Program 6 KI Table 6 Load Sense Pro...

Страница 19: ...nalog Input 2 3 Analog Input 3 4 LVDT 1 Analog Input 4 or 5 Ramp 1 If the Preset Value is chosen the Pressure Limit Preset is used as the pressure limit command Pressure Point 1 Source The Pressure Po...

Страница 20: ...mand Comparing this command with the Point 1 Pressure signal results in an error value The error is multiplied by the KP and KI constants to produce the Yp and Yi contributions to the program output s...

Страница 21: ...and Source The Flow Command Source selects the source of the flow command for the program Valid entries are 0 Preset Value 1 Analog Input 1 2 Analog Input 2 3 Analog Input 3 4 LVDT 1 Analog Input 4 or...

Страница 22: ...urce Table 8 Pressure Control with Flow Preset Programs Function Programs 9 and 10 provide for Pressure Control with Flow Preset Program 9 is configured in program items 480 through 489 in the Program...

Страница 23: ...d as a percentage with 0 equivalent to a 0VDC input signal and 100 equivalent to a 10VDC signal This value is used as the toggle point between Pressure and Flow control If the Q to P Control Switch So...

Страница 24: ...mand is set at a 50 level program item 481 50 The Pressure Feedback Source is Analog Input 2 program item 484 2 The Q to P Control Switch Source is Limit Offset program item 489 6 The Q to P Control S...

Страница 25: ...and Preset is not used in this example The Q to P Control Switch Source is Limit Offset program item 489 6 The Q to P Control Switch Preset is set to 10 program item 488 10 therefore the Q to P Toggle...

Страница 26: ...500 through 507 in the Program 11 Form Program 12 is configured in program items 510 through 517 in the Program 12 Form Command Preset The Command Preset allows for direct numeric input for the contro...

Страница 27: ...al gain setting to PI control loop of the program KP is configured as a percentage with 0 to no proportional gain and 100 equivalent to maximum proportional gain KI KI provides the integral gain setti...

Страница 28: ...he Command Preset is set to 10 program item 500 10 although the Command Preset is not used in this example The Feedback Source is Analog Input 2 program item 502 2 The error signal is produced by comp...

Страница 29: ...6 Bulletin 836260F 29 Figure12 AdvancedControlwithFeed ForwardPrograminOpenLoop Example Figure 12 shows Program 11 Form for Advanced Control with Feed Forward in Open Loop The Command is offset and m...

Страница 30: ...ontrol while the Pump Controller provides inner loop control The output of the pre defined programs is very nearly always passed through to the Pump Controller module refer to Section 4 2 1 for an ove...

Страница 31: ...gram item 800 and setting values for KP program item 804 and KI program item 805 for the Stroke PI Controller These values can be optimal adjusted from the Pump Controller Form Stroke Feedback Device...

Страница 32: ...controller command as the stroke feedback Pressure Feedback Source The Pressure Feedback Source determines which pressure signal is used in the HP calculation Valid entries are 0 No HP Limit 1 Analog...

Страница 33: ...he maximum 4 3 2 6 Dither The EPC provides for a dither signal that is superimposed on the final output to the current driver The dither is set from the Pump Controller Form the dither option is only...

Страница 34: ...em 800 4 The internal HP calculation based on these pressure and stroke signals results in a value of 4 56V The HP Limit Factor of 28 results in a value of 2 80V so the actual HP is greater than the a...

Страница 35: ...125 to 4 Analog Input 1 Gain 852 0 to 1 Analog Input 1 Polarity 853 0 to 1 Analog Input 1 Current Fault Enable 860 10V to 10V Analog Input 2 Offset 861 0 125 to 4 Analog Input 2 Gain 862 0 to 1 Analog...

Страница 36: ...al or 1 Inverted Inverting the input in this way would be equivalent to reversing wire leads to the module In fact a better long term solution to using the invert setting would be to reverse the wire...

Страница 37: ...ge from the original 2VDC to 10VDC voltage Next the user would set the gain to 2 5 program item 852 2 5 This creates a 10VDC to 10VDC voltage from the offset voltage of 4VDC to 4VDC Finally the user w...

Страница 38: ...refer to Section 4 4 5 for a thorough discussion of this adjustment mode Course and Fine Gains Since greater resolution is needed to scale and offset the input of the sinusoidal LVDT input signals the...

Страница 39: ...2 program item 933 is located on terminals 7 and 8 typically connected to an analog input of a PLC Figure 16 Analog Outputs The test point can easily be monitored externally The signals for the progr...

Страница 40: ...ngs are applied AFTER the Polarity setting and BEFORE the Current Limit Setting The Servo Driver Attenuation parameter menu item 965 attenuates the servo driver signal Valid entries are from 0 4 to 10...

Страница 41: ...ecial operation mode in which an Adjust Mode Toggle Command controls the servo driver rather than the Pump Controller or Active Function block The Adjust Mode works optimally with Main Pumps off and P...

Страница 42: ...positive and full negative current to the driver If in Adjustment mode the following graphics are shown The graphic will appear as in Figure 18 when the toggle sets the servo valve driver at neutral...

Страница 43: ...l remove command to the valve the valve might stay in its current state or it may move in either direction For a uni directional pump only one port is available and the stroke can supply 0 to 100 of t...

Страница 44: ...a one digit course gain change is unable to produce LVDT signals within the configuration range For a uni directional pump a positive toggle command should produce an LVDT signal slightly less than 1...

Страница 45: ...26 20 respectively Notice that at this point approximate values are good enough The user then attempts to adjust the gain to near saturation At a Course gain 30 the low reading is 91 60 while the hig...

Страница 46: ...ns 4 5 1 Horsepower Limit Factor Calculation The horsepower limit factor can be used to limit the power consumed by the hydraulic pump To limit horsepower the user first enters a value for the HP fact...

Страница 47: ...re the EPC for stroke feedback Section 4 4 2 and connect a pressure transducer to an available analog input An additional analog input can be used for stroke command The user then sets the HP factor t...

Страница 48: ...ed by the equation 6 0 107 Where Power is the motor rating in kW DMAX is the maximum displacement of the Pump in ml rev PXDCR is the maximum measured pressure in Bars i e the pressure corresponding to...

Страница 49: ...cy of 80 at maximum pressure These values are used in the formula 4 0 107 4 0 107 25 4 60 5000 1500 0 80 23 Example 2 What HP factor would be used for a PVG100 powered by a 50 kW motor rotating at 150...

Страница 50: ...be disabled and the ramp function will be equal to 2048 DAC counts Rate and Step The Ramp module provides different ramping rates for acceleration and deceleration Acceleration is defined as increasi...

Страница 51: ...value while not producing an undesirable step Generally the lower the values for rate and step the smaller the step Example 3 Which of the following are the optimal settings for a 0 5 Volt second ram...

Страница 52: ...Closed Loop Response 0 004884 Step Rate Rate Closed Loop Response 0 004884 Step Ramp Rate 1600 0 004884 10 2 39 A step of 10 and rate of 39 make a 2 0037 Volt second ramp 48 mV step every 24 milliseco...

Страница 53: ...Converter counts 5 1 1 DAC Counts Most Diagnostic numbers are stored as a 12 Bit number from 0 to 4095 For an input or output variable 0 DAC counts is equivalent to 10VDC while 4095 DAC counts is equ...

Страница 54: ...color of Valve Current LED indicates the direction of the current to the valve The intensity of the Valve Current LED indicates the amount of current to the valve Color Direction Intensity Current Gre...

Страница 55: ...6260F 55 5 3 Basic Diagnostics with PC Interface The Basic Diagnostics are easily identifiable through the Analog IO Configuration Form Items include Digital Input Digital Output Analog Input 1 Analog...

Страница 56: ...ble 21 Selection Diagnostic 0 Output Disabled 1 Analog Input 1 2 Analog Input 2 3 Analog Input 3 4 Analog Input 4 LVDT 5 Current Feedback Signal 6 LVDT sine wave excitation signal 7 12VDC Supply 8 12V...

Страница 57: ...0 to 7 A fault condition will be represented by the system message box turning red In addition a triangle with an exclamation sign inside it indicates the specific fault Fault Bit Fault Condition 0 Li...

Страница 58: ...TRONIC Telephone 231 929 1660 Oilgear Fax 231 929 7879 1424 International Dr Issued May 31 2018 Web Site www oilgear com Traverse City MI USA 4 9 6 8 6 Bulletin 836260F 6 Technical Data 6 1 Module Pin...

Страница 59: ...VDC Current mode 0 to 20mA or 4 to 20mA see Note 3 LVDT Inputs 1 approximately0 to 20VDC Test Point Output 1 10VDC see Note 1 Programmable Outputs 2 10VDC see Notes 1 2 Notes 1 Output signal programma...

Страница 60: ...rt contact The Oilgear Company The Oilgear Company 1424 International Dr Traverse City MI USA 4 9686 Voice Support 231 929 1660 Fax Support 231 929 7879 E Mail Support USSales oilgear com Website www...

Страница 61: ...ase see the Accessories Section for more information Standard Configured Modules are intended for standard single unit applications or replacement parts for Small Engineered Systems The modules are pr...

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