Variable Frequency System
Vibratory Schematic Variable Frequency).
(1) Vibratory motor. (2) Cooling relief valve. (3) Oil line from propel cooling valve. (4) Closed circuit loop line. (5) Check valve. (6) Servo piston
assembly. (7) Charge relief valve. (8) Oil line from hydraulic oil filter. (9) Vibratory pump. (10) Vibratory flushing valve. (11) Closed circuit loop line.
(12) Check valve. (13) Hydraulic oil tank. (14) Electrical Displacement Control valve (EDC).
The variable frequency vibratory circuit is an option. The
vibratory circuit, flushing circuit and motor are the same as
used in the fixed frequency. The control of the pump is
In the fixed displacement system, the pump output remains the
same. The direction of flow changes in closed loop circuit
passages (4) and (11), to increase or decrease the vibratory
weight amplitude. Vibrations Per Minute (VPM) is fixed.
In the variable frequency system, the output (flow) of the pump
is variable. The high/low amplitude control switch is the same.
The frequency (VPM) of the weight is variable between 1400-
1800 vpm. The variable output of pump (9) is controlled by
electrical displacement control valve (EDC)(14).