Lambda EMS 7.5-75 Operator's Manual

Contents

Lambda EMS 7.5-75 Operator's Manual Manual pdf 11 page image

1.5 ENVIRONMENTAL SPECIFICATIONSü Operating Temperature: 0-50°C without deratingü Storage Temperature: -40 to +85°Cü Operating Humidity: 20 - 95% RH non-condensingü Storage Humidity: 20-95% RH non-condensingü Altitude: 10,000 ft.1.5.1 ELECTRICAL INSTALLATION CATEGORIESü Overvoltage Category IIü Pollution Degree 21.5.2 OPERATING TEMPERATUREAll EMS power supplies are capable of continuous duty performance without deviation fromtheir specifications in ambient temperatures between 0°C and 50°C. The output voltagetemperature coefficient is 0.02%/°C of the rated output voltage. The output currenttemperature coefficient is 0.03%/°C of the rated output current. For ambient temperaturesbetween 50°C and 70°C the supply's output power is de-rated by a factor of 5% per 1°C.Units may be safely stored at temperatures of -55°C to +85°C.1.6 OVER TEMPERATURE PROTECTIONAutomatic protection against excessive temperatures is provided by a thermostat mounted onthe heat sink. If the heat sink temperature reaches allowable maximum temperature, the unitwill shut down to prevent damage. An automatic restart circuit will be activated once safeoperating temperature levels are restored.1.7 OVERVOLTAGE PROTECTION (FOR OUTPUTS ≤ 300 VDC)The Overvoltage protection circuitry, adjustable from the front panel, is standard on all EMSmodels. This circuitry will short circuit (crowbar) the power supply's output to protect theload, and turns the control circuitry off if the output voltage reaches the preset value. Thisprotection is effective regardless of the cause of the overvoltage.1.8 RSTL CONTROLLER BOARDThis is an optional board that can be installed at the customer’s request. Units which haveRSTL installed have all the features of a standard unit except Remote Sense. Theinstallation of the RSTL would require an additional 1.75” to the height of the power supply.The board is designed for remote computer control, functionally duplicating the controls onthe front panel of the power supply. These controls select the programming levels (Voltageand Current), and provide metering of the supply’s output. The RSTL, when set in theREMOTE mode, disables the front panel controls (the meters still read), and asserts controlof the power supply. RSTL is not currently available in CE models. Contact the factory forfurther information.83-473-000 Revision J1 - 6 General Information