Bendix Commercial Vehicle Systems WS-20 WHEEL SPEED SENSOR 1/05 User Manual
Page 2
2
ANTILOCK CONTROLLER
& RELAY
WS-20
™
SPEED SENSORS
EXCITERS
FRONT WHEEL
REAR WHEELS
feature allows the WS-20
™
sensor to "self adjust" after it
has been installed in the mounting block and the wheel is
installed.
When the WS-20
™
sensor is inserted all the way into the
mounting block and the wheel is installed on the axle, the
hub exciter contacts the sensor, which pushes the sensor
back. Also, normal bearing play will "bump" the sensor away
from the exciter. The combination of these two actions will
establish a running clearance or air gap between the sensor
and exciter.
FIGURE 2 - SPEED SENSOR VOLTAGE CYCLE OUTPUT
PEAK TO PEAK
PEAK TO PEAK
HIGH SPEED
LOW SPEED
TECHNICAL INFORMATION
Electrical Connector-
2 Pin.
Output Voltage-
With a 3,000 Ohm resistor across
the two sensor leads, output voltage
measured on a VOM = .800 VAC
Minimum at 42 Hz, or
approximately 5 mph.
Sensor Gap-
0 to .015 inch.
Sensor Body-
Formulated Epoxy; .628" Diameter.
Normal Resistance
Range at Room Temp- 2000-2500 ohms
PREVENTIVE MAINTENANCE
1. Every 3 months; 25,000 miles; 900 operating hours; or
during the vehicle chassis lubrication interval, make the
visual inspections noted in "SERVICE CHECKS"
below.
2. Every 12 months; 100,000 miles; or 3600 operating hours,
perform the OPERATIONAL TEST in this manual.
SERVICE CHECKS
Check all wiring and connectors. Make sure connections
are free from visible damage.
Examine the sensor. Make sure the sensor, mounting
bracket, and foundation brake components are not damaged.
Repair/replace as necessary.
WARNING! PLEASE READ AND FOLLOW
THESE INSTRUCTIONS TO
AVOID
PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following
general precautions should be observed at all times.
1.
Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2.
Stop the engine and remove ignition key when
working under or around the vehicle. When
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3.
Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4.
If the work is being performed on the vehicle’s air
brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure from
FIGURE 3 - TYPICAL ANTILOCK SYSTEM