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Reed Switch
A read switch mounted on the display board shall be used to detect the presence of a
magnet attached to a safety lanyard. In the event the magnet is removed. The four-digit
display shall read "SAFE" and power to be removed from all relays.
Mechanical Buttons.
(6) Mechanical buttons identical to the one on the sample display board shall be used to
input
ON/OFF
INCREASE SPEED
DECREASE SPEED
ELEVATION UP
ELEVATION DOWN
SCAN DISPLAY
On Board Displays
(2) 7 segment speed display (same as on existing board)
(4) 7 segment multiplex display (Time, Distance, Elevation, Calories)
(4) Green LEDs to indicate which mode the multiplexed display is in.
Display Board Inputs:
+9VDC unregulated
Ground
Elevation Grade Pot Sense - Analog input
Speed Sense - Digital Input
Display Board Outputs
+6VDC Relay Power - Powers (3) JA1A-DC6V relays (maximum 2 on at time)
+5VDC Grade Pot Power, Speed Sensor Power - Protected from intermittent
shorts.
BELT-RELAY
UP-RELAY
DOWN-RELAY
Speed Control
(600mA total power for entire system including relays)
Connected to coil of JA1A-DC6V relay
Connected to coil of JA1A--DC6V relay
Connected to coil of JA1A-DC6V relay
(digital pulse train - current loop)
68
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