Gardner Denver VS-11, Руководство по эксплуатации и обслуживанию, Страница: 27 / 68

13-18-606 Page 26
SECTION 4
CONTROLS & INSTRUMENTATION
GENERAL DESCRIPTION - The Gardner Denver rotary screw compressor package is pre-wired with all electrical
components suitable for the voltage and horsepower at time of order. It is only necessary to connect the
compressor unit to the correct power supply, to the shop air supply network and to the appropriate water supply, if
using the water-cooled variant. A standard single stage compressor package consists of an unitized module that
houses a single rotary screw compressor, oil sump, separation, filtering, and internal injection delivery system, a
main drive motor, a VFD, an oil/air cooling system, IP54 electrical enclosure to house VFD on common controller
and a sound-attenuating enclosure. The various control devices employed are described as follows:
Controller - The compressor package features the AirSmart controller, which integrates all the control functions
under microprocessor control. 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.
NOTICE
Read the Operator’s Manual before operating the compressor. It is critical that
the detailed instructions for the controller, found in the controller manual 13-17-
600, are read and understood. Once the appropriate parameters have been
selected for the controller, compressor operation may commence. For your
convenience, a “Quick Start” excerpt from the controller manual is shown in
Section 3.
Press the red “STOP/RESET” button to clear any conditions (e.g., “Loss of Power” when electrical system was
energized) and start the unit by pushing the green “START” button. Since the unit is equipped with a minimum
pressure (60 psig, 4.1 bar) valve, no special procedure to maintain minimum reservoir pressure is required.
Main VFD and Motor – The compressor is driven by an inverter-duty electric motor, which in turn is energized by
a pulse-width modulated, variable frequency drive (commonly referred to as VFD). This combination of
components enables the compressor package to match the supply of compressed air (e.g., flow capacity) to meet
the customer’s demand in real time and in a step-less fashion. The operational logic which governs the drive and
motor-combination is supplied by the AirSmart controller and it is based on the following basic rules:
•
The speed of the compressor is modulated (e.g., increased or decreased) until the desired system discharge
pressure is achieved.
The drive shares a common IP54 protected enclosure with the AirSmart controller and assorted electrical
hardware. Ventilation for the electronics is supplied forced air delivered by the heat exchanger cooling fan and
filtered by inlet and outlet filters. The motor is built with a TEFC protected frame and mounted directly to the
package base – the compressor is pivoted on one axis to provide adjustability for the power transmitting V-belts.
The drive includes adequate current overload protection for its companion motor.
The drive and motor are designed to operate with 3ph, 60Hz, 460 vac electrical power, which must be installed in
accordance with local (site) Electrical Code requirements.