1.5 ENVIRONMENTAL SPECIFICATIONS
Ÿ
Operating Temperature: 0-50°C without derating
Ÿ
Storage Temperature: -40 to +85°C
Ÿ
Operating Humidity: 20 - 95% RH non-condensing
Ÿ
Storage Humidity: 20-95% RH non-condensing
Ÿ
Altitude: 10,000 ft.
1.5.1 ELECTRICAL INSTALLATION CATEGORIES
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Overvoltage Category II
Ÿ
Pollution Degree 2
1.5.2 OPERATING TEMPERATURE
All EMS power supplies are capable of continuous duty performance without deviation from
their specifications in ambient temperatures between 0°C and 50°C. The output voltage
temperature coefficient is 0.02%/°C of the rated output voltage. The output current
temperature coefficient is 0.03%/°C of the rated output current. For ambient temperatures
between 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 PROTECTION
Automatic protection against excessive temperatures is provided by a thermostat mounted on
the heat sink. If the heat sink temperature reaches allowable maximum temperature, the unit
will shut down to prevent damage. An automatic restart circuit will be activated once safe
operating 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 EMS
models. This circuitry will short circuit (crowbar) the power supply's output to protect the
load, and turns the control circuitry off if the output voltage reaches the preset value. This
protection is effective regardless of the cause of the overvoltage.
1.8 RSTL CONTROLLER BOARD
This is an optional board that can be installed at the customer’s request. Units which have
RSTL installed have all the features of a standard unit except Remote Sense. The
installation 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 on
the front panel of the power supply. These controls select the programming levels (Voltage
and Current), and provide metering of the supply’s output. The RSTL, when set in the
REMOTE mode, disables the front panel controls (the meters still read), and asserts control
of the power supply. RSTL is not currently available in CE models. Contact the factory for
further information.
83-473-000 Revision J
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General Information
