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MODEL 220
HYDRAULIC
IMPACT HAMMER
VI.
ELECTRICAL CIRCUITRY
B. STROKE RANGE SELECT
With the diesel engine running and the MAIN POWER switch ON, turning the
Clamp switch (OPEN-CLOSE) to OPEN energizes the open-clamp solenoid (OPEN
SOL). This extends the variable stroke cylinder, fully extending this cylinder puts
the hammer in minimum stroke mode. Release the switch to the neutral position,
for regular operation. This is the recommended starting position.
With the diesel engine running and the MAIN POWER switch ON, turning the
Clamp switch (OPEN-CLOSE) to CLOSE energizes the close-clamp solenoid
(CLOSE SOL) on the clamp valve (V1). This retracts the variable stroke cylinder,
fully retracting this cylinder puts the hammer in full stroke mode. Returning the
switch to the neutral position. De-energizes the close clamp solenoid and holds the
stroke control cylinder at the desired position.
Adjusting the position of the variable stroke cylinder to where the stroke length most
adequately suits the job conditions. This can be done at any time as described
above.
NOTE: The pressure switch (PS1) shown in the stroke control portion of the
electrical schematic is not used in the operation of the Model 220 hydraulic
impact hammer. The adjustment of this switch should remain at the setting
required for a Vibratory Driver/Extractor.
C. HYDRAULIC HAMMER
With the diesel engine running and the MAIN POWER switch ON, turning the
hammer switch (FORWARD-REVERSE) to FORWARD energizes the hammer-start
solenoid (V2A) on the DIRECTIONAL CONTROL valve.
CONTROL valve shifts, sending hydraulic oil to the hammer and the hammer
begins to run. Turning the hammer switch to the OFF position will stop the hammer
from lifting again.
D. REMOTE - LOCAL CONTROL
Located on the control panel.
activates only the hammer and stroke control switches located on the control panel.
Turning the LOCAL-REMOTE switch to REMOTE only permits operation of the
hammer from the control pendant.
pendant, is functional at all times.
Turning the LOCAL-REMOTE switch to LOCAL
The EMERGENCY STOP button, on the
VI-2
The DIRECTIONAL
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