Rev. Date: 3/14/18 Page 20
MODEL #500
Electrical Flowchart
(illustration T)
ELECTRICAL SYSTEM
General Operation: (See illustration T for sequence and illustrations G,U,V and W for components)
This unit is powered by one or two separate input sources connected at the bottom of the Main Panel Box. Turning the Main
Disconnect Switch (yellow and red switch located on front of Main Control Panel) to the ON position distributes power to the
Terminal Boards of the Main Control Panel, Voltmeter, Kill Switch, and the Upper Terminals of the agitator (C4) and the blower
(C5) relays.
When the Kill Switch (red mushroom button) is released (closed) and the green Start Button is pressed, power is supplied to
the dropout relay(s) and the transformer. The transformer supplies 24 VAC to the 4-Position Selector Switch located on the
front of the Main Panel Box.
When the 4-Position Selector Switch is turned to MANUAL mode or the 4-Position Selector Switch is set to REMOTE mode
with remote control hand pendant switch closed, 24 VAC is supplied to the Pre-Alarm relay, sounding the alarm for a preset
time. After the alarm stops, 24 VAC powers the blower (C5) and/or agitator (C4) relays.
When the agitator (C4) relay is closed, power is also supplied to the 24 VAC ON/OFF Outlet on Main Control Panel. If power
is interrupted to this system by unplugging either main input cord(s), turning Main Disconnect Switch OFF, or pressing Kill
Switch; the green Start Button needs to be pressed to reactivate the system after power distribution into the system has
been reestablished. (See illustrations U, V & W for more details.)
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