Danfoss MCW102B Installation guide

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

MCW102B

Proportional Rotary Position Controller

BLN-95-8970-4 Issued: January 1995

• Non-contacting sensing element for long life

• Fully burned-in components for added reliability

• Bright up/down lights for easy nulling

• Adjustable sensitivity

• Run/Standby switch for manual or automatic control

• Remote setpoint or steering feedback connections avail­able

TECHNICAL DATA

ELECTRICAL

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

• Reverse polarity and short circuit protection

• Rugged aluminum housing

• Withstands high vibration and shock

• Moisture and corrosion resistant

• Easy to mount

• Adjustable tracking force

.

MECHANICAL

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%

humidity at 38° C for 10 days, the controller will perform

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 1

TECHNICAL DATA

(continued)

VIBRATION

Withstands a vibration test designed for mobile equip­ment controls consisting of two parts:

1. Cycling from 5 to 2000 Hz in each of the three axes.

2. Resonance dwell for one million cycles for each
resonant point in each of the three axes.

Run from 1 g to 8 g’s. Acceleration level varies with
frequency.

DIMENSIONS

SHOCK

50 g for 11 milliseconds. Three shocks in both directions
of the three mutually perpendicular axes for a total of 18
shocks.

DIMENSIONS

See the Dimensions Drawing.

BLN-95-8970-4

1304

Dimensions of the MCW102B in Millimeters (inches).

2

TECNICAL DATA

(continued)

PERFORMANCE

TEST CONDITIONS

SUPPLY: 14 Vdc or 24 Vdc
GAIN: Maximum (full cw)
RUN/STANDBY SWITCH: Run

TEMPERATURE: 25° C

Shaft rotation measured at end of 4.25 inch long horizon­tal arm. (Equivalent to a standard 6 inch long sensing

arm trailing at 45°).

MAXIMUM TORQUE

6.0 in-gms required to rotate the shaft from either side of
null to the stop.

NULL CENTERING

With the shaft roll pin centered between the stops,

electrical null will occur within ± .37 inches.

GAIN SETTING

Electrical null will vary .01 inch maximum from maximum
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.

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. Indica­tor 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
MCW102B shaft must rotate clockwise to null facing the
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.

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.

BLOCK DIAGRAM

OSCILLATOR

HALL EFFECT

SENSOR

GAIN LIGHT

RUN/STANDBY SWITCH

On Standby, output will be 0 ± 1 mA.

LIGHT

POWER

DRIVE

RUN

STANDBY

MCW102

KVF

FLOW CONTROL

SERVOVALVE

(TYPICAL)

1740

3

BLN-95-8970-4