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Hersteller: DeVillbiss Air Power Company Dateigröße: 3.49 mb Dateiname: 2006SSD_75_R3.pdf Unterrichtssprache:

• The valve is a back pressure regulator which can maintain a steady discharge pressure, however the majority of packages with our modules are controlled through suction gas recycle. Also, most packages have a back pressure regulator on the discharge of our modules to control the actual discharge pressure to a minimum of 70 PSIG. • The presence of the valve was thought to protect the end user in case the discharge of our module is isolated from the skid-level pressure relief valve and the other safeties on our module (high pressure switch, drive current limit) are disabled or modified. However, inspectors do not consider our gas bypass valve to be a high pressure safety device. It is the packager’s responsibility to provide adequate high pressure safety relief/shutdown. Packagers will need to install downstream pressure relief of our module. 2.3 Ambient Temperature Range The Compressor Module operating ambient temperature is 20°F to +122°F (-29° to +50°C). For details on ambient temperatures for VFD startup and Compressor Module operation, see Table 7 on page 27. Model Max Delivery Pressure PSIG (barg) Max Flow MCFD (MCMD) Drive HP High Press Switch Setting PSIG (barg) Low Press Switch Setting High Temp Setting °F (°C) Oil Thermal Bypass Valve Setpoint °F (°C) Gas Bypass Valve Module Weight Lbs. (kg) Dual Scroll Units SZO56C1A-EDE-110 150 (10.3) 260 (7.36) 30 215 (14.8) 0.75 PSIG (52 mbarg) 240 (116) 200 (93) NO 600 (272) SZO44C1A-EDE-140 190 (13.1) 200 (5.7) 30 215 (14.8) 0.75 PSIG (52 mbarg) 240 (116) 200 (93) NO 600 (272) SZO44C1A-EDE-244 190 (13.1) 200 (5.7) 30 215 (14.8) 0.75 PSIG (52 mbarg) 240 (116) 200 (93) YES 625 (283) SZV44C1A-EDE-140 190 (13.1) 200 (5.7) 30 215 (14.8) 0.75 PSIG (52 mbarg) 280 (138) 250 (121) NO 625 (283) SZV32C1A-EDE-150 275 (19.0) 150 (4.2) 30 290 (20.0) 0.75 PSIG (52 mbarg) 280 (138) 250 (121) NO 600 (272) 7 2006SSD-75 R4 (10/10) Dual-Compressor Module Installation TOP VIEW FRONT VIEW SIDE VIEW BOTTOM VIEW 2.4 Installation Clearance and Dimensions Allow sufficient clearance on all sides for service access, especially for gas and electrical connections at the rear of the Compressor Module. Check applicable national and local electrical codes. Cooling air flow is back to front—from the gas connection end to the oil cooler end. Do not block or restrict the cooler fans or oil cooler. Refer to Figure 4 for the dimensions of the Compressor Module. Figure 4 Compressor Module Dimensions, in. (mm) 8 2006SSD-75 R4 (10/10) Dual-Compressor Module Installation 2.5 Process and Instrumentation Diagrams (P&IDs) Figure 5 Compressor Module Gas and Oil Flow Diagram and Safety Shutdowns PI 002 TE 002 TS 002 TSHH 002 PI 003 EX - 04 BPV-01 SEP-01 TCV-03 FL-05 PS 002 PSHH 002 PS 001 PSLL 001 480V J.B. SEP-02 Module Limits Gas Suction 1-1/2" -NPT Gas Discharge 1" -NPT C-02 C-01 Code Description BPV-01 Gas bypass valve (optional) C-01 / C-02 Compressor and motor EX-04 Oil cooler, fan controlled by thermistor FL-05 Oil filter PI002 Pressure gauge on first-stage oil separator PI003 Pressure gauge on second-stage oil separator PS002 / PSHH002 High discharge gas pressure switch PS001 / PSLL001 Inlet low pressure switch SEP-01 First-stage oil separator, 6” O.D. SEP-02 Second-stage oil separator/coalescing element TCV-03 Thermal bypass valve, 3-way, set @ 200°F (93°C) TE002 Fan speed thermistor TS002 / TSHH002 High discharge gas temp switch 9 2006SSD-75 R4 (10/10) Dual-Compressor Module Installation 2.6 Electrical Controls 2.6.1 General Considerations All shutdown devices are dry contact switches rated Class I, Division II that are wired to a terminal box for connection to the packager supplied control circuit. The common wires on all switches are connected together. All switches are closed unless a fault condition is detected. All safety and protective devices must be installed and used in accordance with applicable codes and regulations. Switches All switch connections are wired to terminal strips in a junction box on the Compressor Module. Switch Status • Low Inlet Gas Pressure Normally Open, closes on pressure rise • High Discharge Gas Pressure Normally Closed, opens on pressure rise • High Temperature Normally Closed, opens on temperature rise Electrical Considerations - Variable Speed Compressor Module • The Compressor power for a variable speed Compressor Module is the Variable Frequency Drive (VFD). • Compressor speed control can be either a 4-20 mA or 0-10V signal (transducer supplied by customer) applied to the VFD. Speed can also be manually controlled with a potentiometer or the VFD can be set for a fixed speed. • Each Compressor on a module must be protected by an individual manual reset overload between the VFD and the Compressor. • The overloads should be able to be set at a maximum of 26A. • If either overload opens, the VFD must be disabled. • The overloads must be configured for manual reset. • Normal full load run current for each Compressor on the module at 4800 rpm (80 Hz) is approximat...

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