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SECTION 4
CONTROLS & INSTRUMENTATION
GENERAL DESCRIPTION
The Gardner Denver rotary screw compressor is pre-wired with all controls, motor, and starter for the
voltage and horsepower at the time of ordering. It is necessary only to connect the compressor unit to the
correct power supply and to the shop airline. A standard package unit consists of the GD1 compressor,
oil separation module, air/oil cooling and filtration system, TEAO electric main motor, full-voltage magnetic
starter (variable speed drive in 1 phase models) housed in an UL Type 1 (NEMA 1) enclosure/control box,
and control components as described below.
ELECTRONIC CONTROLLER AND STARTER ASSEMBLY HARDWARE - See to the Wiring
Diagrams listed [by voltage] at the end of this section, for more details on the location of the
referred hardware.
GD Pilot Controller - The compressor package features the GD Pilot controller, which integrates all the
control functions under microprocessor control, see Figure 4-1 for general detail of the controller keypad
and display. Controller functions include safety and shutdown, compressor regulation, operator control
and advisory/maintenance indicators. The keypad and display provides a logical and easily operated
control of the compressor and indication of its condition. The controller is factory adjusted for the
compressor package, but allows tuning for specific applications.
FIGURE 4-1 GD Pilot Controller Layout and Main Screen
Emergency Stop Pushbutton - This is a maintained pushbutton, and removes power from the controller
outputs regardless of controller status. It is located on the electrical panel door, below the controller
keypad. This should be used for emergency purposes only, use the (O) key for normal controlled
stopping.
Control Transformer – A control transformer is provided to supply 230 and 24 VAC control power
supply.
Fuse Blocks – Fuse blocks provide input and output side protection for the control transformer.
13-25-629 v03
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