MCW102B
Proportional Rotary Position Controller
BLN-95-8970-4 |
Issued: January 1995 |
DESCRIPTION
The MCW102B Proportional Rotary Position Controller provides automatic grade and steering control on paving, curbing and planing machines. It uses a follower arm riding
on a stringline or a ski riding on the prepared surface as a grade reference. In steering applications, the MCW102B uses a vertical follower arm riding against a stringline reference. The MCW102B controls servovalves to position a screed, form cutting drum, or steer cylinder.
FEATURES
• Non-contacting sensing element for long life |
• Reverse polarity and short circuit protection |
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• Fully burned-in components for added reliability |
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Rugged aluminum housing |
• Bright up/down lights for easy nulling |
• Withstands high vibration and shock |
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• Adjustable sensitivity |
• Moisture and corrosion resistant |
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• Run/Standby switch for manual or automatic control |
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Easy to mount |
• Remotesetpointorsteeringfeedbackconnectionsavail- |
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Adjustable tracking force |
able |
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TECHNICAL DATA
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ELECTRICAL MECHANICAL
SUPPLY VOLTAGE 12 or 24 Vdc
0.5 amps Does not include output current to load.
MAXIMUM OUTPUT CURRENT @ 14 VDC SUPPLY 170 ± 20 mA with 23 ohm load
The MCW102B drives a number of Danfoss servovalves.
MAXIMUM REVERSED POLARITY VOLTAGE 50 Vdc for 5 minutes
SHORT CIRCUIT PROTECTION
The controllers are protected against short circuits across the valve coil as well as shorts between the outputs and ground. A short circuit is defined as 1 ohm maximum resistance for 5 minutes maximum.
LOAD DUMP
Protected against load dump per SAE J2.20.97
Physical stops limit the rotation to approximately ± 23° from null.
ENVIRONMENTAL
OPERATING TEMPERATURE -18° to 77° C (0° to 170° F)
STORAGE TEMPERATURE -30° to 65° C (-22° to 150° F)
HUMIDITY
After being placed in a controlled atmosphere of 95% humidityat38 ° Cfor10days,thecontrollerwillperform within specification limits.
RAIN
The controller will withstand exposure to a 15 minute shower with cold water after reaching the maximum storage temperature.
© Danfoss, 2013-09 |
BLN-95-8970-4 |
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TECHNICAL DATA (continued)
VIBRATION |
SHOCK |
Withstands a vibration test designed for mobile equip- |
50gfor11milliseconds.Threeshocksinbothdirections |
ment controls consisting of two parts: |
ofthethreemutuallyperpendicularaxesforatotalof18 |
1. Cyclingfrom5to2000Hzineachofthethreeaxes. |
shocks. |
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2. Resonance dwell for one million cycles for each |
DIMENSIONS |
resonant point in each of the three axes. |
See the Dimensions Drawing. |
Run from 1 g to 8 g’s. Acceleration level varies with |
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frequency. |
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DIMENSIONS |
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1304
Dimensions of the MCW102B in Millimeters (inches).
BLN-95-8970-4 |
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TECNICAL DATA (continued)
PERFORMANCE
TEST CONDITIONS
SUPPLY: 14 Vdc or 24 Vdc GAIN: Maximum (full cw) RUN/STANDBY SWITCH: Run TEMPERATURE: 25° C
Shaftrotationmeasuredatendof4.25inchlonghorizontal arm. (Equivalent to a standard 6 inch long sensing arm trailing at 45°).
MAXIMUM TORQUE
6.0in-gmsrequiredtorotatetheshaftfromeithersideof null to the stop.
NULL CENTERING
With the shaft roll pin centered between the stops, electrical null will occur within ± .37 inches.
GAIN SETTING Electricalnullwillvary.01inchmaximumfrommaximum to minimum gain.
MAXIMUM TEMPERATURE NULL SHIFT
.15 inch vertical deflection over the range from 0 ° to 50 ° C (32° to 122° F). A larger null shift may occur over a greater temperature span. It is recommended that the user re-null the MCW102B each morning before using. See the Adjustment section.
PHASING
Facing the hub with the lamps up, a clockwise shaft rotation will make pin F positive with respect to pin E. The right lamp will come on. If desirable, this phasing can be reversed. Model MCW102B1020 has reverse phasing.
PROPORTIONAL BAND
.30 ± .10 inches
INDICATOR LAMPS DEADBAND (MCW102B)
.05 inches maximum
GAIN SETTING EFFECT ON INDICATOR NULL
.01 maximum from maximum to minimum gain. Indica-
tor and valve null track within less than .01 inches equivalent at the grade sensing point.
CENTERING
Lamps will come on within .04 inches of each other.
NULL POINT STABILITY
Changes in supply voltage from 11 to 15 Vdc will not change the null point more than .02 inches.
REMOTE SETPOINT/STEERING FEEDBACK PHASING With the feedback potentiometer turned fully clockwise (toward the positive end of the potentiometer), the MCW102Bshaftmustrotateclockwisetonullfacingthe
hub.
NULL SETTING WITH REMOTE SETPOINT/STEERING FEEDBACK
With the feedback potentiometer at either end, the MCW102B will null within 15° of the null point without remote input.
RUN/STANDBY SWITCH
On Standby, output will be 0 ± 1 mA.
BLOCK DIAGRAM
OSCILLATOR
LIGHT
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POWER |
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RUN |
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DRIVE |
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STANDBY |
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KVF |
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HALL EFFECT |
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FLOW CONTROL |
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SERVOVALVE |
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SENSOR |
GAIN |
LIGHT |
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(TYPICAL) |
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MCW102
1740
3 |
BLN-95-8970-4 |
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