Autoquip BASCULE BRIDGE - DOUBLE LEAF - Manual (Page 27)

Down Pushbutton
Pressing the “DOWN” pushbutton momentarily changes the signal to an “UP” signal
through the safety legs fully retracted limit switches. The signal energizes the motor
starter causing the bridge to rise slightly. At the same time, the “DOWN” pushbutton
energizes the safety legs retract solenoid “B” through the motor starter auxiliary contact,
causing the safety legs to be powered inward.
When the safety legs are retracted, the safety legs fully retracted limit switches trip,
causing the motor starter to de-energize and changes the signal to a “DOWN’ signal by
energizing the down solenoid.
When the motor starter is de-energized (above) the auxiliary contact of the motor starter
opens, de-energizing the safety legs retract solenoid “B”. The Bascule Bridge will lower
at this time.
Release the “DOWN” pushbutton when the Bascule Bridge is fully lowered.
NOTES:
1. The safety legs do not rest on the curb angle in normal bridge operation.
2. The pushbuttons are constant-pressure (Dead Man) type. At any time during any
of the sequences, releasing the pushbutton will cause all functions to cease and
Bascule Bridge and safety legs will stop until a pushbutton is once again
depressed.
WARNING!
OPERATING INSTRUCTIONS
Under circumstances should the flow control be modified or removed from
the pump or Deltatrol to obtain faster lowering speed. A loaded lift can
reach dangerous and destructive speed and/or unnecessary closing of the
velocity fuses.
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