Stimmen - 3, Durchschnittliche Bewertung: 4.3 ( )

Hersteller: DeVillbiss Air Power Company Dateigröße: 3.03 mb Dateiname: 2008SSD_34_complete.pdf Unterrichtssprache:

Figure 9 Oil Cooling and Thermal Valve A B C Oil Cooler Return 1st-Stage Separator to Compressor 12 2008SSD-34 (5/11) Single-Compressor Module Installation 2.6.3 Compressor Module Motor Protection Variable Speed Compressor Module Protection • The VFD provides overload protection for the compressor. • Module capacity can be changed by varying the typical Compressor speed, ranging from 2400 to 4800 rpm. Figure 10 Motor Control 13 2008SSD-34 (5/11) Single-Compressor Module Installation 2.6.4 Electrical Requirements Figure 11 Typical Compressor Module Electrical Requirements 1 2 3 4 Optional if more than one compressor module used Power to Compressors 24VDC Cooling Fan 24V Discrete Inputs from Scroll Module 1 1 Table 2 Typical Compressor Module power supply requirements Compressor Power (data based on 480VAC) Variable Speed Module horsepower 10 or 15 HP VFD voltage supply range 342-528VAC Phase 3-phase* Frequency 50/60 Hz Low Voltage DC Specifications - Oil Cooler Fan Voltage and Power Fan motor voltage 24VDC Total fan motor current 4.5A Additional power may be required to support customer logic and control circuits. * Contact factory for information about single-phase applications. ** Reduced capacity at 50 Hz. Code Description 1 Control Techniques VFD,* 10 or 15 HP model specific 2 24VDC power supply ** 3 PLC or other control for inputs from Compressor Module 4 480V 3-phase input *** Notes * VFD on Variable Speed Drive models. ** All other components supplied by Packagers. *** Contact factory for information about single-phase and other voltage applications. Optional if more than one Compressor Module used 14 2008SSD-34 (5/11) Single-Compressor Module Installation 2.6.5 Wiring Figure 12 Control Circuit Terminations Control Wiring Terminations 15 2008SSD-34 (5/11) Single-Compressor Module Installation 2.6.6 Variable Frequency Drive (VFD) Terminations Refer to Product Bulletin on Variable Frequency Drive Applications for details on VFD terminations and typical VFD parameters. 3.0 Operation 3.1 Initial Startup - Compressor Module The following inspections should be made on initial startup—-typically, by the Packager—and after long periods of storage. • Verify acceptable pre-startup conditions using the checklist in 3.1.1 - Pre-Startup Checklist. • Start the Compressor Module, then perform the checks in 3.1.2 - Post-Startup Checklist. 3.1.1 Pre-Startup Checklist Perform these checks BEFORE starting the Compressor Module: MAIN POWER Check for the following conditions: ___ 1. Motor type is correct for the application, either Variable Speed C3A or C2A motor. ___ 2. Power phasing to the terminal strip and Compressors is correct. ___ 3. Supply voltage to the Variable Frequency Drive (VFD) or Fixed Speed Compressor motors is correct. ___ 4. All chassis, earth grounds are connected. ___ 5. A load reactor or other approved filter is installed for systems with power lead lengths in excess of 200 ft. (61m) between the VFD and Compressor Module terminal box. LOW VOLTAGE DEVICES Verify these conditions for low voltage devices: ___ 1. DC polarity is correct. ___ 2. Temperature control device—if other than standard thermistor control—is working properly. SAFETY AND CONTROL DEVICES Make sure that all safety and control switches and devices are configured to inhibit Compressor operation if a fault condition is detected, including: ___ 1. Low inlet pressure switch ___ 2. High discharge pressure switch ___ 3. High temperature switch ___ 4. Variable Frequency Drive (VFD) fault ___ 5. Motor overload trip ___ 6. Other safety and control switches and devices MECHANICAL SYSTEMS Inspect for these conditions: ___ 1. (Required) Compressor inlet is protected from water slugging. ___ 2. (Recommended) Gas filtration and treatment is appropriate for the application. ___ 3. Packager configuration applies back pressure to the Compressors. ___ 4. Inlet and discharge valves allow the module to be isolated. ___ 5. All guards and protective covers are installed. ___ 6. Protection from freezing is provided if needed for the application and location. ___ 7. A suitable enclosure providing protection from the elements is appropriate for the application and location. 16 2008SSD-34 (5/11) Single-Compressor Module Operation 3.1.2 Post-Startup Checklist Perform these checks AFTER starting the Compressor Module: DURING INITIAL OPERATION, PERFORM THESE CHECKS: ___ 1. Compressor Module builds pressure on initial startup; no unusual mechanical noise. ___ 2. Oil level is correct at minimum and maximum speeds. ___ 3. No gas leaks are present. ___ 4. No oil leaks are present. ___ 5. Oil cooler fan turn on and run at the appropriate temperature. ___ 6. Oil cooler fan speed varies with temperature. ___ 7. Compressor motor speed varies appropriately for the Packager configuration. ___ 8. Compressor continues to operate in bypass when the Compressor Module discharge is blocked. ___ 9. Compressor Module is leak tight (maintains approximately 30 psig or more when the C...

Herunterladen

Geben Sie zwei Ziffern: