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LED Speed Indicator
 Microprocessor-controlled, with a display panel that features
light-emitting diodes (LED), this Bach-Simpson speed indicator
has achieved wide acceptance with railroad crews; while it's
dependable accuracy and rugged reliability, make it popular
with railroad purchasing and maintenance personnel.
It is fully interchangeable with the electrical connections
and mounting brackets of older analog models, making this unit
a convenient replacement.
Double diodes in green, mark every five increment, offsetting
them from the yellow, single-mile diodes. Other features include
separate digital display of speed, acceleration indicator and
overspeed warning. Options include multiple speed controlled
relay outputs.
Our speed indicators are available as base mount, console
mount or center cab mounted units for maximum versatility.
Other models include a two-piece system, allowing the control
circuitry to be remotely mounted from the display, for limited
space applications.
Electrical Specifications
Power Input:
- +74 VDC nominal at 0.35 amp
- 50 to 90 volts sustained performance range
- Reverse polarity and transient protected
- Case Electrically Isolated from supply
Speed Signal Input:
- 20 or 60 pulses per wheel revolution
- 100 volts maximum
- Input impedance: 47K ohms
- Power input isolated from signal input
Temperature Range:
- Operating: -30°C to 50°C
- Storage: -55°C to 60°C
External Connectors:
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Functional Specifications
Speed Range (Auto Ranging):
- Nominal range: 0-80 mph
- Low range: 0-8 mph
- Acceleration: 0-99 mph/min
OverSpeed (2 Standard):
- Relay contacts open at selected speed
- Relay contacts protected against shorts and transients
- Relay contacts isolated from supply
Resolution:
- Nominal range: 1 mph
- Low range: 0.1 mph
Speed Maximum Error:
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Specifications subject to change without notice. Contact Bach-Simpson
for the latest information.
Ordering Information
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