Encoder System

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ENCODER LCD BOARD

MODEL# PSS/ENCD.LCD-1A

Description:

 In a depth system, a direction high/low signal along with a pulse for each foot is needed. Normally a computer with expensive software is used to calculate the outputs between selected points. The encoder board has the capability to do this up to 4 points.

Each layer of the draw-works is programmed into the encoder as feet per layer. The encoder board calculates and stores this information. The board then outputs the feet needed for each layer of the draw works as the block moves with a block direction signal.

Microprocessors make it possible for easy update as the needs of your systems change. Custom programming to interface with existing software is available.

The board is setup to output direction and a pulse for every foot of block travel. With these two signals you can measure depth, bit position, block position and rate of penetration.

Features:

	Microprocessor  Design
	Simple 4 Layer Calibration Input the feet needed for each layer.
	Calibration Stored in Flash Memory For board replacement just swap the calibration chip and zero block.
	Edit Feet per Layer Mode Used for fine tuning the depth or after slipping cable.
	Block Direction Output Used for tracking bit position.
	Pulse Output per Foot
	Led Indications: Direction, Feet and Layer Level during Calibration Same LED’s used for calibration and operation.
	Auto Zero Will auto zero block position if power is lost.
	Two additional digital inputs for options use.
	Direction Test Helps when determining the encoder’s direction signals A & B.
	Foot pulse width output adjustment. 1ms - 255ms
	Easy to read LCD 16x1.

Encoder Board Specifications:

Parameter	Value
Input Signal	Quadrature A and B
Input Voltage	9 – 30vdc
Current Draw Standby	13.5ma @ 12vdc - 9.5ma @ 24vdc
Depth Output Pulse Width	10ms TTL Low Pulse Open Collector 2n3904
Reed Relay NO	Up to 1Amp Switching
Block Direction	TTL High = Up, Low = Down
Maximum Input Frequency	400hz
Maximum Encoder PPR	20
Maximum FPL	62 Feet @ 35 Wraps
Minimum FPL	12 Feet @ 35 Wraps
D1, D2 Current Draw	4ma. @ 3.2vdc [IS]
A, B Current  Draw	13ma. @ 5vdc
PC Board Protective Coating	Konform AR2000 (Chemtronics) Clear

Encoder Specifications Electrical:

Parameter	Value
Pulses Per Revolution (PPR)	20
Sensor Pickup	Non-Inductive Prox Switches
Supply Voltage	12-24vdc
Current Requirements	18 ma
Output Format	2 Channel (A & B) Quadrature
Frequency Response	5k max

Encoder Specifications Mechanical:  

Parameter	Value
Shaft Bore	.375”
Mounting	1” 14 threads per inch Stainless Steel
Housing	Aluminum

Note: PPR  = Pulses Per Revolution               FPL = Feet Per Layer

Test and specifications were conducted using a 20PPR encoder.

THE MENU SYSTEM

NOTE: When in calibration you can enter the mode displayed on the LCD by pressing the zero button. Remember to bring the block to the floor and zero after making changes.

Press the zero button [ZEROING BLOCK…] will appear, hold till a beep is heard and [CAL SYS:] is displayed.

The > is for up button and the < is for down button. As you press the up button you will move through the main menu as follows:  

1. CAL SYS: >       Calibrate system  >up

2. EDIT FT:         Edit feet in layers

3. SET PW:          Set pulse width output

4. BLK <>           Check block direction

5. FEET UP ON       Turn up feet pulse on

6. FEET UP OFF      Turn up feet pulse off

7. EXIT CAL<        Exit calibration

The < down button will move in reverse order.  

CALSYS:

This is the full calibration of all four layers. Once calibration starts you must complete all 4 layer settings.

EDIT FT:

You can edit the total feet for each layer in this mode. The current feet will show on the LCD for that layer, but you MUST ENTER THE FEET COUNT AGAIN.

EXAMPLE: [LAYER1 20] this shows you have 20 feet for layer 1. To change press the up or down buttons. If you do not want to change the feet YOU MUST PRESS THE UP AND DWN to put the same feet count in. Press zero to move to next layer after you set the feet.

SET PW:

Use the up and down buttons to enter the pulse width and zero to exit.

BLK <>: 

This is useful when installing the encoder on the draw works. Look at the LCD and verify the block is moving in the direction indicated. If not reverse the A and B encoder signal wires and retest.

FEET UP ON/OFF:

This option lets you control if you want pulse output while the block is moving up.

EXIT CAL:

Exits calibration menu.

ENCODER CALIBRATION

The encoder board accepts feet input by up and down buttons. The input is in total feet measured.  

1. Have the driller lower the elevators to the floor.

2. Press and hold the zero button till the cal led blinks ten times and [CALSYS] is displayed.

3. The first layer led will also light and stay on and a beep will sound. Release the button.

4. Have the driller move the block up till the second layer begins.

5. Measure the feet the elevators moved with the tape. With the up/down buttons input the measured feet and press the zero button.

6. The cal LED will flash showing input and a beep. The display will move to [Layer2]. For reference the direction, feet and the spare LED’s are used to help show the current layer being calibrated. The LED’s are in binary format. Direction=1, feet=2 and n/a=4. See fig 1.

7. Repeat calibration for each layer and then have the driller lower the block to the floor and zero.

8. Have driller move block up and down slowly to check depth on lcd.

9. The depth should be correct. If not see edit depth.

NOTE: The LCD will only show the block position if the block is moving slowly.

DEPTH CORRECTION / SLIPPING CABLE

Sometimes after the driller slips the drill cable the calibration may be off. But before you edit the feet per layer you should have the driller lower the elevators to the floor and enter the main menu.

NOTE: In edit mode all four layers must be entered. Enter the same feet per layer except for the layer you need to change.

In edit mode the driller can work without you interfering. Also you do not have to bother the driller to move the block up for measurement again. You need to determine which layer is off. Look at a 30-ft joint as he drills and see if the depth is 30 feet. Edited in layer 2. Next look at a stand and check for 90ft depth. Edit in layer 3. If the travel is high enough edit layer 4. You need to look at the layers to determine the block travel and the current layer that is off.

	Enter the main menu and then EDIT FEET.
	Enter the same feet per layer, as before except the layer you need to edit.
	After you have entered all four layers have the driller bring the elevators to the floor and press zero to zero the encoder. Or wait till the next connection. Check the feet again.
	Repeat if needed.

Figure 1

  PCB LABELS

NOTE: Feet, direction and n/a are open collector outs do not connect directly to +vcc! This is a switched ground output directly to the collector of the transistor.

Relay Output: NORMALLY OPEN: Allows you to switch up to 1 amp.

Board Labels

The boards have labels to help during installation. Here are some symbols used on the board.

Symbol	Description
<?>	Block Direction
PWR	Power +Voltage input
FT	Foot pulse open collector
D1	Spare option input 1
D2	Spare option input 2
IA	IS input A from Barrier
IB	IS input B from Barrier

Also the output LED’s have a weight values of 4, 2 and 1 to show the current calibration layer.

A jumper supplies the encoder with +5 or supply power.

Draw Works Encoder   

 

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