PULSAR
®
3D SUCTION BLAST CABINET
Page 21
© 2020 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 29374
If the switch does not disengage the pulse when the
cam follower rides off the lobe, the switch assembly
is too close to the lobe. Loosen the two screws on
the bottom of the pedal, slide the switch away from
the lobe as needed, and recheck alignment.
If the switch does not engage the pulse when the
cam follower rides onto the lobe, the switch
assembly is too far from the lobe. Loosen the two
screws on the bottom of the pedal, slide the switch
toward the lobe as needed, and recheck alignment.
When the alignment is set correctly, tighten the screws
to prevent movement.
When the pedal is operating correctly, a spurt of air
should be heard as the cam follower rides off the lobe
when the pedal is pressed and again when it is released.
If the cam follower is working correctly, and there is no
spurt of air when the pedal is pressed and released, it is
likely a problem with the 3-way valve; replace the 3-way
valve.
7.17.5
Check the diaphragm pulse valve and actuator
assembly. Refer to Figure 22.
7.17.5.1
Remove the pilot actuator from the 3-way
pulse valve. With the exhauster running and with blast
pressure adjusted to 0 psi, press in on the 3-way valve
plunger; the cartridge should pulse when the plunger is
pressed and stop when it is released.
If the cartridge does pulse, the diaphragm pulse
valve and 3-way valve are functioning; proceed to
Section 7.17.5.2.
If it does not pulse, listen for a spurt of air coming
from the 3-way exhaust port when the plunger is
pressed.
If it does spurt air, the problem is likely in the
diaphragm pulse valve. Inspect the diaphragm for
wear or damage.
If it does not spurt air, the 3-way valve is not
functioning. Replace the 3-way valve.
NOTE: The 3-way valve at the foot pedal and the 3-way
on the diaphragm pulse valve are identical. If there is
doubt as to whether either 3-way valve is functional, the
valves may be tested by swapping one with the other.
7.17.5.2
Hold the pilot actuator and press and release
the foot pedal. Observe the piston through the open end
of the actuator; the piston should snap to the disc toward
the end of the actuator each time the pedal is pressed,
and return each time the pedal is released.
If the actuator piston operates as noted, the problem
is not in the foot pedal or actuator. Inspect the 3-way
and diaphragm valve, per Section 7.17.5.1.
If the actuator does not operate as noted, remove
the urethane tubing from the actuator and press and
release the foot pedal.
If air escapes from the tubing when the pedal is
pressed and released, the problem is in the
actuator. Replace the actuator.
If no air escapes from the tubing when the pedal is
pressed and released, there is a blockage in the
tubing or the problem is in the foot pedal. Inspect
the tubing for a blockage and inspect the foot
pedal, per Sections 7.17.2, 7.17.3, and 7.17.4.
Figure 22
7.18
A steady stream of air is heard within the dust
collector when the foot pedal is not pressed
7.18.1
Cam follower does not ride off the foot-pedal lobe.
Inspect alignment, per Section 7.17.
7.18.2
Diaphragm in the diaphragm pulse valve may be
ruptured. Inspect the diaphragm.
7.18.3
The 3-way valve on the diaphragm pulse valve is
stuck in the pulse (plunger in) position; inspect 3-way
valve.
Diaphragm Pulse Valve
3-Way Air Valve
Pilot Actuator
Urethane Tubing
Plunger
Exhaust Port
(At bottom of valve)
