Donaldson Cartridge Dust Collector DWS 4-3

Warning: Electrical work must be performed by a qualified electrician and comply with all applicable national and local codes. Turn power off and lock out electrical power sources before performing service or maintenance work. Do not install in classified hazardous atmospheres without an enclosure rated for the application.

The Photohelic combines the functions of a differential pressure gauge and a pressure-based switch. The gauge function measures the pressure difference between the clean and ambient air and provides a visual display of filter condition. The low-pressure tap is located in the clean-air plenum on the back of the cabinet. The pressure-based switch function provides high-pressure ON and low-pressure OFF control of the filter cleaning system.

Choose a convenient, accessible location on or near the unit for mounting that provides the best visual advantage.

Mount the gauge to the remote panel or door using the mounting ring, retaining ring, and four #6-32 x 1 1/4-inch screws. Do not tighten screws. Connect one 1/8-inch NPT x 1/4-inch OD male adapter to the low-pressure port of the gauge. Align the adapter to the 2.375-inch hole in the right-hand side of the mounting bracket. Tighten screws.

Zero and maintain the gauge as directed in the manufacturer’s operating and maintenance instructions provided.

Sign off on the gauge replacement

IEC Control Panel with Programmable Logic Control

This control panel contains a safety disconnect switch, blower motor control, pulse control functions, and a Magnehelic gauge. The Programmable Logic Control, PLC, provides features such as sequential start-up, staggered aftershift cleaning, and troubleshooting capabilities.

1. This control panel includes magnetic starters with a low-voltage control circuit.

2. The blower motor ON/OFF buttons are located on the control panel cover. A red blower motor RUNNING light is also provided.

3. Sequential start-up is provided for all DWS 4- and DWS 6-2, 3, and 4 modules. This allows a delay between starting each blower motor and reduces undesirable overload current at start-up.

4. The control panel has troubleshooting capabilities. If a blower motor shuts down due to a failure, such as an overload, the panel will flash the red RUNNING light quickly. The two amber lights, CLEANING and AFTERSHIFT CLEANING, will also flash indicating which circuit tripped the alarm.

For example: The overload on motor protector #3 is tripped. The red RUNNING light will flash quickly and the two amber lights, CLEANING and AFTERSHIFT CLEANING, will flash three times, then pause and repeat. This indicates that motor protector #3 has been tripped. The lights will continue to flash until the alarm is serviced.

5. Thermal overload relays and circuit breakers are provided for the motor circuit and fuses for the low voltage circuit. Standard voltages available are 208/230/460/575/60 Hz/3 phase.

Filter Removal and Installation

Use proper safety and protective equipment when removing contaminants and filters.

Dirty filters may be heavier than they appear.

Use care when removing filters to avoid personal injury.

Note: Remove filter cartridges by opening the top and bottom doors. Start with the top filters first. Optional plastic filter bags are offered for filter and dustpan dust removal for cleanliness.

1. Turn the knob counterclockwise until it is loose. Remove the knob and access cover.

2. Remove the filter cartridge from the yoke.

Sprinkler systems place a large quantity of water in the dust collector when activated. Provide adequate drainage to remove water. Excess water weight can cause the leg structure to collapse.

Optional fire control sprinklers are available for all models operating under negative pressure. Donaldson Torit supplied sprinklers require a minimum of 15 psig water pressure to each module. The volume of water discharged per sprinkler head is 20 gallons per minute.

Consult with local authorities when installing fire control systems on dust collection equipment.

1. Open the front access doors to access the sprinkler tap located in the dirty-air plenum.

2. Apply pipe sealant to the threads of the pipe reducer located on the sprinkler assembly.

3. Thread the sprinkler assembly onto the 1-inch diameter sprinkler tap.

Warning: This procedure requires trained personnel with PPE!

Enter the location for mounting the gauge

Pressure ports on the back of the gauge plugged using the two supplied 1/8-inch NPT pipe plugs

One 1/8-inch NPT male adapter installed into the low-pressure port on the side of the gauge

Mounting bracket attached using three #6-32 x 1/4-inch screws supplied

Gauge and bracket assembly mounted to the supporting structure using three self-drilling screws

Gauge zeroed and maintained as directed in the manufacturer’s operating and maintenance instructions

Sign off on the Magnehelic Gauge Replacement