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Downflo Workstation, DWST 4-1 to 6-4
A20
IEC Control Panel with Programmable Logic Control
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.
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.
Blower Control Functions
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.