Stack ST500 User Manual

ST500 Tach-Timer Maintenance
© Stack Limited
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Typical wheel circumference is 1800mm (70 inches) for a car or 900mm
(35 inches) for a kart
No speed reading. Speed reading erratic, value jumps high or low.
• Faulty sensor and/or wiring
Check the sensor indicator for correct operation
Rotate the wheel by hand and check that the sensor indicator lights
up as each target passes the sensor
• Incorrect sensor gap (too far or too close)
Check that the gap is approximately 1mm +/– 0.5mm
• Sensor and targets moving apart
Fabricate a more rigid sensor bracket
Speed reading dies after a short time
• Ambient temperature is too high
Shield the sensor from radiated heat from brakes and bearings. Insulate
the sensor from conducted heat with fibre washers. Duct cooling air
around the sensor.
Maximum temperature for correct operation of the wheel speed
sensor is +80°C (175°F)

Stack ST500 Specifications

General

Brand	Stack
Model	ST500
Category	Measuring Instruments
Language	English