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MCW104A
BLN-95-8960-7 Issued: February 1998
Rotary Sensor/Controller
DESCRIPTION
The MCW104A Rotary Sensor/Controller is used to control
asphalt height on paving machines. The device is mounted
on one end of the asphalt auger such that the material level
in front of the auger rotates the Sensor’s paddle as it rises.
Height information is then sent to a proportional hydrostatic
transmission actuator to modulate the speed of the auger,
thus controlling material height.
FEATURES
• Sealed gain selection switch
• Heavy duty coil cord of eighteen gauge wire with neo-
prene insulation
• Coated printed circuit board resists effects of diesel fuel
• Flexibility with three-position gain switch
• Easy to install
• Vibration, shock, humidity and rain resistant
• May be mounted on either side of vehicle
TECHNICAL DATA
ELECTRICAL
SUPPLY VOLTAGE
11 to 15 Vdc
OUTPUT VOLTAGE
11.4 Vdc minimum at 14 Vdc supply into a 25 ohm load
CONNECTION DIAGRAM
ORDERING INFORMATION
SPECIFY
1. Model Number MCW104A1001 or MCW104A1027
Typical Hookup for the MCW104A.
1066A
PUMP
STROKER
B
A
12 Vdc
5 PIN
CONNECTOR
E
D
C
B
A
CONNECTING CABLE
MCW104A
PUMP
STROKER
B
A
12 Vdc
5 PIN
CONNECTOR
E
D
C
B
A
CONNECTING CABLE
MCW104A
THIS HOOKUP TURNS THE MCV104A ON WITH
COUNTERCLOCKWISE ROTATION OF THE INPUT SHAFT
THIS HOOKUP TURNS THE MCV104A ON WITH
CLOCKWISE ROTATION OF THE INPUT SHAFT
© Danfoss, 2013-09 BLN-95-8960-7 1
2
DIMENSIONS
1064
Dimensions of the MCW104A in Millimeters (Inches).
THEORY OF OPERATION
The MCW104A is composed of a shaft connected to a
potentiometer and a signal amplifier. Rotary Sensors are
positioned at the far ends of the asphalt auger. The cus-
tomer-supplied paddle arms rotate the input shaft in
proportion to asphalt height at the two ends. As the asphalt
rises and the arms rotate, the potentiometer wiper acts as the
input signal to a modified differential amplifier, where it
undergoes a gain determined by a network of resistors. A
gain selection switch modifies this resistor network. The
output of the differential amplifier is again amplified and fed
to the hydrostatic transmission actuator. The actuator modu-
lates the pump which varies the speed of the motor driving the
feed augers, thus controlling the height of the asphalt on the
auger and depth of the asphalt ahead of the screed. Propor-
tional control of auger speed thus allows the machine
operator to vary his forward speed while maintaining a
constant asphalt height.
Set your individual gain as desired. The High position
provides the greatest sensitivity in that a 15° rotation of the
input shaft will give full output. In the Medium position a 30°
rotation will give full output. The Low position requires 45° of
rotation for full output. The Medium position provides
smooth operation and will be satisfactory under most oper-
ating conditions.
PERFORMANCE
SHAFT ROTATION
220° between stops
PROPORTIONAL BAND
With 14 Vdc supply voltage and a 25 ohm load, the
clockwise shaft rotation beyond the switch-on point of
110° required to increase the output voltage from .1 to
11.4 Vdc shall be as follows:
GAIN SWITCH SETTING SHAFT ROTATION
Medium
Low
15°
30°
45°
High
BLN-95-8960-7
3
CUSTOMER SERVICE
NORTH AMERICA
ORDER FROM
Danfoss (US) Company
Customer Service Department
3500 Annapolis Lane North
Minneapolis, Minnesota 55447
Phone: (763) 509-2084
Fax: (763) 559-0108
DEVICE REPAIR
For devices in need of repair or evaluation, include a
description of the problem and what work you believe
needs to be done, along with your name, address and
telephone number.
RETURN TO
Danfoss (US) Company
Return Goods Department
3500 Annapolis Lane North
Minneapolis, Minnesota 55447
EUROPE
ORDER FROM
Danfoss (Neumünster) GmbH & Co.
Order Entry Department
Krokamp 35
Postfach 2460
D-24531 Neumünster
Germany
Phone: 49-4321-8710
Fax: 49-4321-871-184
BLN-95-8960-7
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