Danfoss W895A Installation guide

W895A

Proportional Grade/Steering Controller

BLN-95-8973-2 Issued: April 1996

DESCRIPTION

The W895A Proportional Rotary Position Controller is used to provide grade or steering control of paving, trenching, curbing or similar construction machines. The Controller uses a follower to sense the grade level or steering direction from a stringline or other reference surface. When a grade or steering error is sensed, an electrical signal is provided to the servovalve, such as the KVF, to reposition the machine.

The W895A consists of a microsyn transducer and an amplifier in a single housing. Modular design with plug-in electrical interconnection allows easy component troubleshooting or replacement.

The W895A may be used with either a right angle stringline follower or a straight tubular wand. The right angle follower is used for grade control with a stringline; when used with a firm surface, a skate and ski assembly is attached to a grid arm follower. The straight tubular wand is used for steering control.

FEATURES

• Easy to install

• Modular design with replacement modules

• Easy to service - single plug-in connector between modules

• May be mounted on either side of equipment

• Adjustable tracking force

• Rugged aluminum housing

• Operator can override with manual control

ORDERING INFORMATION

SPECIFY

1. Model Number W895A. See Table A.

2. Accessories

3. Spare Parts

TABLE A.

ORDER NUMBER DESCRIPTION

W895A1038 12 Vdc, Drives KVF

W895A1053 Without Amp

ACCESSORIES

Order the necessary parts from the list below. See the following pages for part pictures.

1. KG07002 Steering Follower Wand

2. KG04003 Right Angle Grade Follower

3. K09274 Grid Arm

• Zero-center meter shows deviation from setpoint in RUN or STANDBY operation

• Shock and vibration resistant

• Reverse polarity and short circuit protection

• Moisture and corrosion resistant

• Adjustable sensitivity

• Dithered output

5. KG06001 Skate Assembly (must be used with the

K09274 Grid Arm)

6. KVF Servovalve

7. ACX104C Rotary Position Sensor

8. KW01013 Cable (two-foot coiled cable that extends to

ten feet. Has right angle connector on one end and straight connector on the other. Mates with the ten-pin W895A Connector and an MS3102A18-1P plug (Part Number K03989)).

9. KW01017 Cable (two-foot coiled cable that extends to

ten feet. Has straight connector on one end and spade lugs on the other. Mates with the ten-pin W895A Connector and a terminal strip.)

10. KW01001 Cable (two-foot coiled cable that extends to

five feet. Has straight connector on one end and spade lugs on the other. Mates with the five-pin W895A Connector and a terminal strip)

4. KG02001 Ski Runner (must be used with the KG06001 Skate Assembly)

ORDERING INFORMATION

SPARE PARTS IDENTIFICATION

(continued)

GAIN ADJUSTMENT

ITEM NUMBER PART NUMBER DESCRIPTION

1 K04463 Amplifier Module

2 † Cover Screw (2) 8-32, 1/2 inch

3 † Cover Retaining Bar Mounting Screw (2) Pan Head 8-32, 1/4 inch

4 † Cap and Chain Mounting Screw (2) Round Head 6-32, 5/16 inch

5 K03368 Spring Bias Assembly

6 K04232 Hub Assembly With Channel

GRADE/SLOPE SWITCH

1181A

7 K04224 Transducer Including MS Connector

8 † Stop Screw, Fillister Head 10-32, 1/2 inch

9 K04228 Hub Assembly With Stop Pins

† Standard hardware items. Obtain locally. Only those parts listed by Part Number should be ordered from Danfoss. Return the devices for repair if replacing individual parts is insufficient.

TECHNICAL DATA

ELECTRICAL

INPUT VOLTAGE

11 to 15 Vdc

RATED OUTPUT VOLTAGE

5.8 Vdc (12 Vdc input, 32 ohm, .5 henry load)

GAIN

(with six-inch right angle follower at 45° trailing angle)

1. At minimum gain (full counter-clockwise) no output voltage for any error input.

2. At maximum gain (full clockwise) .09 inches vertical deviation yields full drive current to the KVF Servovalve.

MECHANICAL

SHAFT TORQUE

6.0 inch-grams within 5° of null

NULL

Electrical null is located with the flat edge of the hub at

90 ± 5° from the back (mounting stud) side of the case.

ENVIRONMENTAL

TEMPERATURE RANGE

-40° to 77° C (-40° to 170° F) storage 0° to 77° C (32° to 170° F) operating

SHOCK

50 g for 11 milliseconds. Three shocks in both directions of the three mutually perpendicular axes for a total of 18 shocks.

SHAFT ROTATION

± 20°

BLN-95-8973-2

TECHNICAL DATA

(continued)

VIBRATION

Withstands a vibration test designed for mobile equipment controls consisting of two parts:

1. Cycling from 5 to 2000 Hz in each of the three axes.

2. Resonance dwell for one million cycles for each resonance point in each of the three axes.

Run from 1 g to 46 g's. Acceleration level varies with frequency.

HUMIDITY

After being placed in a controlled atmosphere of 95%

humidity at 49° C (120° F) for 10 days, the sensor will

perform within specification limits.

DIMENSIONS

DUST

After being placed in a controlled atmosphere of dust simulating outdoor conditions for 24 hours, the W895A will perform within specification limits.

WEIGHT

3.2 kg (7 lbs.)

DIMENSIONS

See Dimension Drawing.

Dimensions of the W895A in Millimeters (Inches).

1174

BLN-95-8973-2

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