MEDIPULSE 2342se ERGONOMIC SUCTION BLAST CABINET
Page 26
© 2019
CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 24939, Rev. C, 03/19
8.17
Dust collector does not pulse when foot
pedal is pressed or released
8.17.1
Check pressure on dust-collector pulse-pressure
gauge. If low, adjust pulse pressure, per Section 5.6.
8.17.2
Refer to Figure 31 and make sure the 3-way
pulse valve has not come loose from the mounting
bracket. Tighten the retaining nut as needed to secure.
8.17.3
If the cam follower tilts to one side, one or both
roll pins are bent or missing. Remove the two screws on
the bottom of the pedal and remove the switch and cam
follower assembly. Center the cam follower and replace
roll pins as needed to hold the cam follower in place.
Refer to Figure 31.
Figure 31
8.17.4
Check alignment of pulse-valve cam follower:
With the exhauster running and with blast pressure
adjusted to 0 psi, hold the foot pedal in hand and fully
press the pedal top. The collector should pulse as the
cam follower rides over the lobe on the pedal top when
the pedal is pressed, and again when the pedal is
released, as shown in Figure 31. Note: The pedal should
be rapidly pressed and released so the cam follower
quickly rides over the lobe; prolonged engagement of
the pulse valve will lengthen the pulse, which does not
clean the cartridge and wastes compressed air.
The lobe on the pedal top should press the cam follower
IN to engage the 3-way pulse valve, and disengage the
switch when the pedal is fully pressed and again when
the pedal is released. If the switch is not aligned to
function as described, align as follows:
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.
8.17.5
Check the diaphragm pulse valve and actuator
assembly. Refer to Figure 32.
8.17.5.1
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 released.
If the cartridge does pulse, the diaphragm pulse
valve and 3-way valve are functioning; proceed to
Section 8.17.5.2.
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.
Lobe
Cam Follower
Pulse Valve Plunger
Foot Pedal Top
Cam follower rests off
the bottom of the lobe
(no pulse).
Cam follower rests off
the top of the lobe
(no pulse).
3-Way
Pulse Valve
Pedal Base
The lobe pushes cam
follower in, pushing
pulse switch plunger in,
and pulses cartridge.
Roll Pins
Keeps follower upright.
Loosen screws and slide bracket as necessary to
pulse when the follower is on the lobe, and not pulse
when follower is off the lobe (when the pedal is fully
pressed or fully released).
Foot pedal top up - nonblast position.
Pedal top partially pressed down.
Foot pedal top fully pressed down.
Mounting Bracket
Bracket Screws
