Pulsafeeder Pulsar Shadow - Manual (Page 9)

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2.2.3 Control Assembly
Figure 5
PULSAR pumps incorporate a lost motion style of stroke length adjustment to limit piston travel
during the suction portion of each stroke. The stroke length setting is denoted by a (0 - 100) scale
located on the top of the unit.
Stroke is changed by depressing and turning the hand knob. This turns a screw which locates a slider
cam to position the follower pin as to limit the rearward travel of the piston. If the control cover is
removed and replaced, the bolts should be tightened to 20-24 In-lb (225 – 270 N-cm).
PULSAR pumps may also be equipped with the Pulsafeeder DLC or DLCM electronic stroke length
controllers. These allow for local and/or remote automatic control over stroke length (DLC) or stroke
length and motor speed (DLCM). Pumps equipped with the DLC or DLCM controllers are provided
with separate instructions for the controller. Refer to the appropriate Installation, Operation and
Maintenance Manual (IOM-PS-DLC-1101 or IOM-PS-DLCM-1101).
Some PULSAR pumps may also be equipped with the MPC control which allows for pump flow
control over a wide range via a specially designed variable speed drive. The MPC Installation,
Operation and Maintenance manual IOM-MPC-0104 covers information specific to this type of
control and should be consulted prior to operating the pump or the controller.