Danfoss W894A Installation guide

W894A

Proportional Level Controller

BLN-95-8974-5

Issued: March 1992

DESCRIPTION

The W894A Proportional Level Controller provides automatic slope control of paving, curbing, grading and similar mobile equipment. The Controller measures deviation from a gravity reference and supplies a two-wire output for driving a servovalve such as the MCV113. The W894A operates in 12 Volt electrical systems.

Two modules are housed in the case of the Controller with plug-in electrical interconnections. The transducer sensing module electromagnetically measures the deviation of the equipment it is mounted on from a gravity reference. The amplifier module accepts the signals from the slope sensing module and uses the deviation to provide a corrective output to keep the equipment at the prescribed slope.

FEATURES

•	Rugged aluminum housing	• Reverse polarity and short circuit protection
•	Adjustable sensitivity	•	Moisture and corrosion resistant
•	RUN/STANDBY switch permits operator to switch to	•	Accepts a remote slope setpoint adjuster

manual control

• Withstands vibration and shock

• Deviation meter with zero center shows deviation from setpoint in RUN or STANDBY positions

ORDERING INFORMATION

SPECIFY

1.Model Number W894A. See Table A.

2.Accessories

	TABLE A.

ORDER NUMBER		DESCRIPTION

W894A1053		12Vdc, Drives MCV113
		Hot Side Switching

ACCESSORIES

Order the necessary parts from the list below:

1.MCV113 Servovalve

2.Q625A Remote Setpoint (hand-held setpoint with integral coiled cord and MS connector).

3.Q625A Remote Setpoint (panel-mount setpoint with terminal strip).

4.KW01001 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 five-pin W894A connector and the panel-mount Q625A Remote Setpoint)

5.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 W894A connector and an MS3102A18-1P plug).

6.KW01012 Cable (four-foot coiled cable that extends to twenty feet. Has right angle connector on one end and straight connector on the other. Mates with the ten-pin W894A connector and an MS3102A18-1P plug).

BLN-95-8974-5

TECHNICAL DATA

ELECTRICAL

INPUT VOLTAGE	POWER CONSUMPTION
11 to 15 Vdc	4.5 watts maximum
OUTPUT VOLTAGE	PROPORTIONAL GAIN
5.4 to 6.2 Vdc with a 12 Vdc input into a 32 ohm load. A	With gain potentiometer set to maximum, gain will be 1.7
null meter reading at the red/white division indicates a 3	to 2.7 Vdc per 0.3% slope error input.

Vdc output.

BLOCK DIAGRAM

1183

Schematic of Transducer and Amplifier Sections of the W894A.

CONNECTION DIAGRAM

Typical System Connections.	206C

BLN-95-8974-5

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