Campbell Scientific CS410 Encoder Instruction Manual PDF

CS410 Shaft Encoder Revision: 2/09

C o p y r i g h t 1 9 9 9 - 2 0 0 9 C a m p b e l l S c i e n t i f i c , I n c .

Warranty and Assistance The CS410 SHAFT ENCODER is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer shall assume all costs of removing, reinstalling, and shipping defective products to CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage. This warranty is in lieu of all other warranties, expressed or implied, including warranties of merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC, INC. is not liable for special, indirect, incidental, or consequential damages.

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To obtain a Returned Materials Authorization (RMA), contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an applications engineer determines the nature of the problem, an RMA number will be issued. Please write this number clearly on the outside of the shipping container. CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC. RMA#_____ 815 West 1800 North Logan, Utah 84321-1784

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CS410 Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat bookmarks tab for links to specific sections.

1. General .........................................................................1

2. Specifications ..............................................................1

3. Wiring............................................................................1

4. Installation....................................................................1

5. Programming ...............................................................2 5.1 CR1000 CRBasic Program Example ........................................................2 5.2 CR10X Edlog Program Example..............................................................4 5.3 Entering the Reference Offset for Edlog Program....................................5

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CS410 Shaft Encoder

1. General Shaft encoders monitor fluctuations in water level and the position of water control gates by converting shaft rotation to electronic signals which are then measured by the datalogger.

The CS410 generates two pulse stringsone indicating clockwise and the other counter-clockwise rotation.

2. Specifications Compatible Dataloggers: CR200-series, CR800, CR850, CR1000, CR3000, CR10(X), CR500, CR510, 21X, CR23X, CR7

Power supply: 4 to 5.6 volts

Operating temperature: -25 to +50C

Resolution: 100 counts per revolution

Shaft diameter: 5/16 inch

Maximum cable length: 100 ft (30 m)

Current drain: 0.5 mA

Starting torque: less than 0.125 in oz.

Minimum time between input transitions: 0.75 ms

Output pulse width: 0.25 ms at 25 degrees C

Signal magnitude, Volts: 0 (low), supply voltage (high)

Dimensions (L x W x D, inches): 7 x 4.875 x 4

Weight: 1.8 lbs.

3. Wiring Black -------- GND Red----------- 5V Green -------- P2 White -------- P1 Shield-------- GND

4. Installation Shaft encoders are typically mounted in a stilling well for protection and to dampen waves. Attach the pulley to the CS410. If you have our pulley, part # 10799, it is secured with a 9/64 hex wrench. Mount the encoder in the stilling well allowing for the pulley and tape to be unobstructed. Attach the end hooks to the tape, followed by the float and counter weight. Then drape the tape over the pulley.

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CS410 Shaft Encoder

5. Programming The shaft encoder is measured with the PulseCount instruction in CRBasic and Instruction 3 in Edlog.

Dataloggers that use CRBasic are the CR200-series, CR800, CR850, CR1000, and CR3000. Our older dataloggers use Edlog.

Multiplier for the PulseCount instruction or Instruction 3:

The multiplier is based on the wheel circumference and the shaft encoder counts per revolution:

MULTIPLIER = WHEEL CIRCUM. (in desired units)/ (COUNTS/REV.)

The CS410 has 100 counts/revolution, thus with a 1-foot circumference wheel:

MULTIPLIER = 1/100 = .01 (measures in feet)

5.1 CR1000 CRBasic Program Example This program collects and processes data. Output is set to report the stage level and offset at 15-minute intervals, but is easily changed if desired. Offsets to the Stage level are automatically calculated when an observed gage height is entered into the variable named "enter_obs_gage_ht". The offset and other variables are preserved in the datalogger even if power is lost to the unit. However, any changes to the stage are NOT recorded during power outages.

'CR1000 Series Datalogger 'CS410-L Shaft Encoder 'Declare Public Variables PreserveVariables 'values will be retained even if power is lost Public enter_obs_gage_ht 'variable where you enter observed gage height Public old_gage_ht 'also holding previous value for comparison Public batt_volt Public Stage_lvl, offset,Count(2) Alias Count(1) = Up Alias Count(2) = Down Units Stage_lvl = feet 'modify only if changing Pulley_Circ value, below 'Declare Other Variables Dim FtPerCount 'Declare Constants Const Pulley_circ = 1 'foot (edit if units other than feet are desired for 'the Stage_lvl record, or if using a pulley with different circumference) Const PulsesPerRev = 100 'CS410 encoder resolves 100 counts per revolution

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'Define Data Tables DataTable (Stage,1,-1) DataInterval (0,15,Min,10) Sample (1,Stage_lvl,FP2) Sample (1,offset,FP2) Minimum (1,batt_volt,FP2,0,False) EndTable 'Main Program BeginProg FtPerCount = Pulley_circ/PulsesPerRev Scan (5,Sec,0,0) Battery (Batt_volt) PulseCount (Count(),2,1,0,0,1.0,0) Stage_lvl = Stage_lvl + (Up * FtPerCount) - (Down * FtPerCount) 'If Stage_lvl does not equal the observed gage height, simply enter 'the actual value in the numeric display for "Enter_obs_gage_ht" 'calculate offset when gage height is observed and entered 'into numeric display If enter_obs_gage_ht <> old_gage_ht then offset = enter_obs_gage_ht - stage_lvl Stage_lvl = Stage_lvl + offset old_gage_ht = enter_obs_gage_ht endif 'Call Output Tables CallTable Stage NextScan EndProg

After downloading the program to the datalogger, test the direction of the float movement by raising the float above the water level and note the stage value. If it decreases, the direction is incorrect. This can be corrected in two ways: 1) reverse the float and counterweight on the pulley, or 2) reverse the green and white wires going into the > pulse ports of the datalogger.

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CS410 Shaft Encoder

5.2 CR10X Edlog Program Example This program collects and processes data; additional instructions are required to send the data to final storage. The data must be in final storage to transfer the data to a storage module or to retrieve the data via a telecommunications link.

CR10(X) Program for the CS410:

*Table 1 Program 1: 5 Execution Interval (seconds) 1: Pulse (P3) 1: 1 Reps 2: 1 Pulse Channel 1 3: 0 High Frequency, All Counts 4: 1 Loc [ count_up ] 5: 1 Mult 6: 0 Offset 2: Pulse (P3) 1: 1 Reps 2: 2 Pulse Channel 2 3: 0 High Frequency, All Counts 4: 2 Loc [ count_dwn ] 5: 1 Mult 6: 0 Offset ;PROCESSING INSTRUCTIONS 3: Z=F (P30) 1: 100 F ;pulses per revolution 2: 0 Exponent of 10 3: 3 Z Loc. [ _100 ] 4: Z=F (P30) 1: 1 F ;pulley circumference (1 foot) 2: 0 Exponent of 10 3: 4 Z Loc. [ circ ] 5: Z=X/Y (P38) 1: 4 X Loc. [ circ ] 2: 3 Y Loc. [ _100 ] 3: 5 Z Loc. [ ft_count ] ;feet per count 6: Z=X*Y (P36) 1: 1 X Loc [ count_up ] 2: 5 Y Loc [ ft_count ] 3: 1 Z Loc [ count_up ] 7: Z=X*Y (P36) 1: 2 X Loc [ count_dwn ] 2: 5 Y Loc [ ft_count ] 3: 2 Z Loc [ count_dwn ]

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CS410 Shaft Encoder

8: Z=X+Y (P33) 1: 1 X Loc [ count_up ] 2: 6 Y Loc [ stage_ft ] 3: 6 Z Loc [ stage_ft ] 9: Z=X-Y (P35) 1: 6 X Loc [ stage_ft ] 2: 2 Y Loc [ count_dwn ] 3: 6 Z Loc [ stage_ft ] ;Set offset once when program compiles 10: If Flag/Port (P91) 1: 21 Do if Flag 1 is Low 2: 30 Then Do 11: Z=X+F (P34) 1: 6 X Loc [ stage_ft ] 2: 0 F ;Enter offset here 3: 6 Z Loc [ stage_ft ] 12: Do (P86) 1: 11 Set Flag 1 High 13: End (P95) *Table 2 Program 02: 0.0000 Execution Interval (seconds) *Table 3 Subroutines End Program

After downloading the program, test the direction of the float movement by raising the float up above the water level and note the stage value. If it decreases, the direction is incorrect. This can be corrected in two ways: 1) reverse the float and counter weight on the pulley, or 2) reverse the green and white wires going into the pulse ports of the datalogger.

5.3 Entering the Reference Offset for Edlog Program The offset, which sets the stage value equal to some reference point, should be entered after the system has been installed and the float is resting on the water surface. For a stream stage application the offset is the difference between the staff gage reading and the datalogger reading from the encoder. For example; if the staff gage reads 12.25 feet, and the datalogger reads 0.75 feet, the offset would be 11.50 feet (12.25 - 0.75 = 11.50).

For the example program above the offset would then be added to the program and re-downloaded, or the offset could be added using the keyboard display by entering the value in the 11th step of the program. Another option would be to use the *4 link in your program for the offset to avoid having to enter the program tables (see your datalogger manual or Edlog for details).

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