Manitowoc Published 04-06-18, Control # 231-14 6-9
MLC650 VPC-MAXâ„¢ OPERATOR MANUAL MAINTENANCE
VPC-MAX TROLLEY
The VPC-MAX trolley (1) has two speed sensors (2) and an
absolute encoder (3) that require adjustment.
VPC-MAX Trolley Speed Sensor
The speed sensor used in the VPC-MAX trolley is a sealed
Hall effect, quad output, high current direction speed sensor
with a magnetic pickup. A sensor is mounted in the case of
each hydraulic motor and senses a rotating target ring that is
mounted in the motor. This rotation generates a measurable
voltage, which is used to determine the speed and direction
of the tray.
Adjusting the VPC-MAX Trolley Speed
Sensor
See Figure 6-7 for the following procedure.
1. Disconnect the speed sensor cable (4).
2. Loosen the locknut (5).
3. Turn the speed sensor body (6) clockwise by hand until
the bottom end of the sensor gently touches the motor
target ring.
4. Turn the sensor body counterclockwise 1/4 turn.
Continue turning the sensor body out until the flats on
the sensor body are 22° on either side of the motor shaft
centerline.
NOTE: Do not turn the sensor body out more than 3/4 of a
turn from touching the motor target ring.
5. Tighten the locknut to approximately 13,5 Nm (10 lb ft).
6. Connect the speed sensor cable.
VPC-MAX Trolley Absolute Encoder
The absolute encoder determines its position using a static
reference point. Inside the encoder are two discs, both with
concentric rings with offset markers. One of the discs is fixed
to the shaft and the other moves freely. As the disc on the
shaft turns, the markers along the track of the encoder
change position on the fixed disc. Each configuration along
the disc of an absolute encoder represents a unique binary
code. When a program looks at the binary code, it can
determine the absolute position of the tray.The relationship
between the encoder value and the physical position of the
tray is set at assembly. The system does not need to return
to a calibration point to maintain position accuracy.
Adjusting the VPC-MAX Trolley Absolute
Encoder Backlash
See Figure 6-7 for the following procedure.
1. Loosen the encoder mounting bolts (7).
2. Position the encoder so that the encoder gear (8) tightly
meshes with the pinion gear (9).
NOTE: Do not apply radial load to the encoder shaft.
3. Slide the encoder mounting bracket back approximately
1,5 mm (0.06 in). This will create approximately 1,1 mm
(0.04 in) of backlash.
4. Tighten the encoder mounting bolts.
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