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FEATURES  Wide range of ac and dc input voltages  Extremely high efficiency  Power factor correction  Dual stage current limiting  Overvoltage shut down circuitry  Transformer isolated 24 V dc output  Class 1, DIV 2, Zone 2 applications  UL®, UL-C and CENELEC Certifications  G3 rating for harsh environments  Power for external field devices  Convection cooling (no fans)  Gasketed and sealed housing  Horizontal or vertical DIN rail mounting  Holes for bracket or wall mounting  Relay (form C) status alarm output. WIDE-RANGE INPUT VOLTAGES A high-efficiency input circuit automatically accepts either ac or dc input voltages. The 120/240 V ac or 125 V dc input circuit (P0922YU) provides a range of 85 to 265 V ac at 47 to 63 Hz operation (or 108 to 145 V dc) to meet world-wide power requirements. The 24 V dc power supply input circuit (P0922YC) accepts a range of 18 V dc to 35 V dc. HIGH EFFICIENCY The sealed power supply has exceptional efficiency (up to 95% for P0922YU and up to 81% for P0922YC) resulting in high reliability and low failure rates. They have a return-on-investment (ROI) of less than two years based upon average electrical rates and load. POWER FACTOR CORRECTION CIRCUITRY The advanced design for ac inputs (P0922YU) provides an active sinusoidal current profile for nearunity controlled power factor. CURRENT LIMITING The power supply operates as a constant voltage source with maximum load ratings as listed in the specifications. If load current attempts to exceed greater than 110% of maximum current at the rated 25°C load, the output voltage begins to decrease toward zero, thereby limiting the current delivered to the load. Upon removal of overload, normal operation resumes. OVERVOLTAGE SHUTDOWN Automatic shutdown occurs if operating conditions cause excessive output voltage. After the occurrence of an overvoltage shutdown, input power must be interrupted to re-establish the output. After the cause of the shutdown has been removed, the shutdown circuit resets in less than 30 seconds after the removal of input power. DIVISION 2, ZONE 2 APPLICATION The power supplies are UL and UL-C listed (to UL 1950) as having a Safety Extra Low Voltage (SELV) and can be used in Division 2 and Zone 2 applications. POWER FOR EXTERNAL FIELD DEVICES The actual amount of power required in a standard 200 Series subsystem depends on the number of Fieldbus Modules (FBMs)/Fieldbus Communication Modules (FCMs)/Field Control Processors (FCPs) being powered, the types of termination assemblies used, and whether internal or external powering is used for the individual field device(s)