MCW100C, MCW100E |
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Time Proportional Rotary Position Controller |
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BLN-95-9013-1 |
Issued: March 1995 |
DESCRIPTION |
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The MCW100C,E Time Proportional Rotary Position Controller provides automatic grade or steering control of paving, trenching and curbing machines. The Controller uses a wand follower to sense the grade level or steering command from a stringline or flat surface.
Two modules are housed in the case of the Controller. The grade sensing module electromagnetically measures the machine's deviation from a grade reference. The amplifier module receives the signal from the sensor module and produces a voltage output to drive solenoid valves which, on a typical paving machine, operate lift cylinders. Within the amplifier's proportional band, the percent of time the output is on is proportional to the grade error. The MCW100C,E may be used together with the MCW101 Time Proportional Level Controller to control both parameters simultaneously.
FEATURES
•May be mounted on either side of machine
•Adjustable tracking force
•Dual UP/DOWN lamps show deviation from setpoint in RUN and STANDBY modes
•Adjustable deadband varies sensitivity
•Run/Standby switch permits operator to switch to manual control
•Flexible joint on follower prevents breakage
•Rugged aluminum housing
•12 Vdc or 24 Vdc supply voltage
•Reverse polarity and short circuit protected
•Moisture and corrosion resistant
•Withstands vibration and shock
ORDERING INFORMATION
ACCESSORIES
1.STEERING FOLLOWER
Straight tubular follower, 16 inches long overall with breakaway joint. For steering only. Part number KG07002.
2.RIGHT ANGLE GRADE FOLLOWER
With breakaway joint. For grade applications only. Follows a stringline. Also used with skate assembly, or skate and ski assembly for following hard reference surface. Part number KG04003.
3.RIGHT ANGLE GRADE FOLLOWER LESS SENSING ARM
For grade applications utilizing the skate and/or skate
and ski assemblies. Same as Part number KG04003, above, but without the sensing arm and breakaway joint. Part number K09274.
4.SKATE ASSEMBLY
For grade applications. Use with right angle grade follower (Part number K09274) on hard reference surface Part number KG06001.
5.SKI ASSEMBLY
For grade applications. Used with right angle grade
follower (Part number K09274), and skate assembly (Part number KG06001) on hard reference surface. Part number KG02001.
6.CABLE ASSEMBLY
KW01015 two-foot coiled cable that extends to ten feet (3 meters). Has right angle connector on one end and straight connector on the other end to make connections between the MCW100C,E and Bendix Type No. MS3102A18-1P plug. (Part number K03989).
SERVICE PARTS
1.AMPLIFIER MODULE
Removable modular amplifier can be exchanged with other voltage compatible grade controllers:
Part Number K02910 (12 volt, MCW100C) K02911 (24 volt, MCW100C) K10654 (12 volt, MCW100E) K10655 (24 volt, MCW100E)
2.K00702 Lens
3.K00706 Lamp (12 volt models)
K00707 Lamp (24 volt models)
4.K00665 RUN/STANDBY Switch
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© Copyright 2001, Danfoss (US) Company. |
All rights reserved. Contents subject to change. |
ORDERING INFORMATION (continued)
C O N T R O L L E R |
SUPPLY VOLTAGE |
TYPE OF OUTPUT |
MCW100C1007 |
12 Vdc |
Ground side switching |
MCW100C1015 |
24 Vdc |
Ground side switching |
MCW100E1005 |
12 Vdc |
High side switching |
MCW100E1013 |
24 Vdc |
High side switching |
TECHNICAL DATA
OPERATING VOLTAGE |
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REVERSE POLARITY PROTECTION |
12 Volt Model: 11 to 15 |
Vdc |
200 Vdc, maximum |
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24 Volt Model: 22 to |
30 |
Vdc |
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SHORT CIRCUIT PROTECTION SUPPLY CURRENT Full, with 0.5 Ω maximum resistance
0.6 A, maximum, not including output current to the valve
TIME PROPORTIONAL OUTPUT FREQUENCY MAXIMUM VOLTAGE DROP (3 A load current) f = 3 Hz ± 1 Hz
3.5 Vdc
MINIMUM PULSE WIDTH CURRENT OUTPUT t = 37 ms ± 12 ms
3 A, maximum
BLOCK DIAGRAM MCW100C - Ground Side Switching
Microsyn
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Voltage regulator |
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Battery |
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440 Hz |
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3 Hz |
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Sensitivity potentiometer
V
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t |
1812
BLOCK DIAGRAM MCW100E - High Side Switching
V |
3 Hz |
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Microsyn |
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Sensitivity |
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potentiometer |
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440 Hz |
f |
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Voltage regulator |
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V |
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Battery |
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1842 |
BLN-95-9013
2
THEORY OF OPERATION
The MCW100C,E Time Proportional Grade Controller consists of a grade-sensing transducer and an amplifier. The sensor and amplifier are housed in a single aluminum channel and can be removed easily for repair or replacement. They are connected with a MS-connector.
Steering and grade information is sent to the Controller through either a right angle or straight tube follower. Right angle followers are used to sense grade and are either tubular (for stringlines) or skate and ski (for firm reference surfaces). Straight followers are used to sense a steering path and are tubular. As the reference is raised or lowered - left or right for steering - the transducer shaft is rotated so that the follower maintains contact.
The transducer transforms this shaft rotation into an electrical signal through the rotor/stator interaction. (See Figure 1.)
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Figure 1.
A 440 Hz square wave from the amplifier is applied to the primaries of coils A and B. The stator position with respect to the rotor determines the voltages from the coil secondaries.
The secondary voltages are demodulated in the amplifier to power a bridge network. A 3 Hz triangular wave is summed with the error signal, defined by the difference between the voltages, to effect the time proportioning. (See Figure 2.)
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min. sensitivity |
upper trigger level |
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max. sensitivity |
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sensitivity |
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max. sensitivity
min. sensitivity lower trigger level no output signal to the solenoid valve
upper trigger level |
0 |
error |
output signal to the solenoid valve
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1815
Figure 2.
The sum is compared to a reference voltage by two Schmitt triggers, which drive the solenoids. As the slope sensor rotates, the triangular wave moves up or down with respect to zero error signal. When the triangle crosses the upper or lower trigger level the output signal is turned on. When a Remote Setpoint is used, the difference between the voltages is kept proportional to the commanded slope. The separation between the reference voltages (the deadband) is adjustable through a trim potentiometer in the front panel. At minimum sensitivity (maximum deadband), a 0.4% slope error signal will fire the triggers. At maximum sensitivity (minimum deadband), both triggers will fire alternately at the peaks of the triangular waves, even when the system is level. The sensitivity adjustment controls the difference between the upper and lower trigger from overlap to 0.5% slope.
BLN-95-9013
3
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