Sterlco GH-M Series Extrusion Control Weigh Hoppers - Manual (Page 43)

Chapter 5: Maintenance 43 of 60
5-2 Preventative Maintenance
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.
WARNING! Always remove plug and disconnect power before servicing hopper.
WARNING! Always read operating manual before operating or servicing hopper.
5-3 Corrective Maintenance
Electrical
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
Internal Components of 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.
Note: See Installation Packet supplied with unit for complete electrical
schematics.