Downflo Workstation, DWS 4-1 to 6-4
30
Pulse Control Functions
1. Each power module has four or six 115-Volt AC
solenoid valve enclosure that control four or six
diaphragm valves, which clean the filter cartridges.
The control panel PLC controls the solenoids.
2. The two-position switch on the front panel controls
the HAND pulsing mode. When in the HAND mode,
pulsing is continuous until the switch is turned to
the OFF position or until the blowers are turned off.
If hand pulsing is enabled more than once while
the blowers are on, the last solenoid valve fired is
remembered and the panel fires the next valve in
sequence. Pulsing will be continuous while the DWS
is running. This setting is suggested for high dust
loading situations.
3. The aftershift cleaning function is designed to pulse
for a designated period of time at the end of the work
shift. In this mode, the noise associated with the
pulsing of the filter cartridges can be avoided during
work hours.
4. In conjunction with the aftershift pulsing function,
a toggle switch located inside the control box turns
the blower motors ON or OFF. When the aftershift
push button is activated with the toggle switch in
the STAG position, the even-numbered blowers shut
off and the odd-numbered blowers remain on. All
valves, starting with number one, are pulsed three
times. The even-numbered blowers turn on and the
odd-numbered blowers turn off. All valves are pulsed
three times once more. The even-numbered blowers
remain on for three minutes, when all blowers are
shut down, and the system is deactivated.
Note: Route wiring through the conduit holes located
in the rear of the power module. A conduit hole
is also located in the blower panel above the
solenoid valves. All conduit holes are sized for
3/4-in fittings. Secure all conduit in the blower
plenum and in the solenoid plenum. Seal
conduit to prevent air from passing through to
the control panels.
Blower
Motor 1
M1
M2
M3
Blower
Motor 2
Blower
Motor 3
MMP1
MMP2
MMP3
Supply
Power
Disconnect
to transformer
Optional IEC Control Panel Motor Wiring Diagram
