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Chapter 5: Maintenance 

43 of 60 

 

Our GH Hoppers need periodic maintenance to provide long dependable service. Check these 
elements regularly: 

•  Check functionality of safety circuit daily. 
•  Maintain proper air pressure and drain water from trap assembly on regulator – as 

required. 

This section is designed to give the operator an overview of the electrical system that controls 
the GH Hopper system. Since the hopper’s control panel is a self-contained pluggable item, 
seldom will a maintenance person be required to enter the control panel. For purposes of 
understanding the system, it is advisable that the maintenance personnel be familiar with not 
only the internal workings of the control panel, but also with the input and output signals to 
the GH Hopper. 

This section includes the following:

 

•  Internal components of the control panel 
•  Input signal to the control panel 
•  Output signals from the control panel 

This section describes the internal components of the GH Hopper system control panel. It is 
not the intent of this section to completely familiarize the reader with the details on industrial 
control panel construction or standards, but simply to familiarize the reader with the major 
components inside the control panel. 

The customer must supply 120/1/50 or 60 (or 220/1/50 or 60) via wires L1 & L2 (N). Please 
insure that the earth ground connection is properly connected to an established earth ground.   

•  “Power on” is indicated by a lighted on/off switch. 
•  “Reload” switch controls the vertical reload gate above the hopper. 
•  “Safety Active” light displays status of safety interlock circuit.  Audible alarm horn 

alerts operator to GH Hopper fault.