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. Therightanglefollowerisusedforgradecontrolwithastringline;whenusedwith 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

•Zero-centermetershowsdeviationfromsetpointinRUN or STANDBY operation

•Shock and vibration resistant

•Reverse polarity and short circuit protection

•Moisture and corrosion resistant

•Adjustable sensitivity

•Dithered output

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 following pages for part pictures.

1.KG07002 Steering Follower Wand

2.KG04003 Right Angle Grade Follower

3.K09274 Grid Arm

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

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
the	lugs on the other. Mates with the ten-pin W895A Con-
	nector 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)

© Danfoss, 2013-09

BLN-95-8973-2

.	.	1

ORDERING INFORMATION (continued)

SPARE PARTS IDENTIFICATION

4		GRADE/SLOPE
		SWITCH
	1
3		5
	2	6

9

GAIN ADJUSTMENT

7

8

1181A

ITEM NUMBER PART NUMBER

DESCRIPTION

1K04463 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

5K03368 Spring Bias Assembly

6K04232 Hub Assembly With Channel

7K04224 Transducer Including MS Connector

8

†

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

9K04228 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		SHAFT TORQUE
			6.0 inch-grams within 5° of null
	INPUT VOLTAGE
	11 to 15 Vdc		NULL
	RATED OUTPUT VOLTAGE		Electrical null is located with the flat edge of the hub at
		90		±	°
	5.8 Vdc (12 Vdc input, 32 ohm, .5 henry load)				5 from the back (mounting stud) side of the case.
			ENVIRONMENTAL
	GAIN
			TEMPERATURE RANGE
	(with six-inch right angle follower at 45° trailing angle)
	1. At minimum gain (full counter-clockwise) no output		-40° to 77° C (-40° to 170° F) storage
	voltage for any error input.		0° to 77° C (32° to 170° F) operating
	2. Atmaximumgain(fullclockwise).09inchesvertical
	deviation yields full drive current to the KVFSHOCK
	Servovalve.		50gfor11milliseconds.Threeshocksinbothdirections
	MECHANICAL		ofthethreemutuallyperpendicularaxesforatotalof18
			shocks.

SHAFT ROTATION

± 20°

2	BLN-95-8973-2

TECHNICAL DATA (continued)

VIBRATION

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

1.Cyclingfrom5to2000Hzineachofthethreeaxes.

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.

DUST

After being placed in a controlled atmosphere of dust simulatingoutdoorconditionsfor24hours,theW895Awill perform within specification limits.

WEIGHT

3.2 kg (7 lbs.)

DIMENSIONS

See Dimension Drawing.

DIMENSIONS

1174

Dimensions of the W895A in Millimeters (Inches).

3	BLN-95-8973-2