Danfoss W894A Installation guide

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

W894A

Proportional Level Controller

BLN-95-8974-5 Issued: March 1992

• Rugged aluminum housing

• Adjustable sensitivity

• RUN/STANDBY switch permits operator to switch to
manual control

• 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

• Reverse polarity and short circuit protection

• Moisture and corrosion resistant

• Accepts a remote slope setpoint adjuster

• Withstands vibration and shock

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).

© Danfoss, 2013-09 BLN-95-8974-5 1

TECHNICAL DATA

ELECTRICAL

INPUT VOLTAGE

11 to 15 Vdc

OUTPUT VOLTAGE

5.4 to 6.2 Vdc with a 12 Vdc input into a 32 ohm load. A
null meter reading at the red/white division indicates a 3
Vdc output.

BLOCK DIAGRAM

POWER CONSUMPTION

4.5 watts maximum

PROPORTIONAL GAIN

With gain potentiometer set to maximum, gain will be 1.7
to 2.7 Vdc per 0.3% slope error input.

Schematic of Transducer and Amplifier Sections of the W894A.

CONNECTION DIAGRAM

1183

BLN-95-8974-5

Typical System Connections.

2

206C