Description & Overview - Samlexpower SEC-1223 Owner's Manual

SECTION 3
3.1 DESCRIPTION
SEC-1212 / SEC-1223 are switched mode power supplies which convert 120 VAC, 50/60 Hz
(or 230 VAC, 50/60 Hz*) to regulated 13.8 VDC based on pulse width modulation (PWM)
control.
*NOTE: The units are factory preset to operate from input voltage of 120 VAC, 50/60 Hz.
These may be set to operate from input voltage of 230 VAC, 50/60 Hz by chang-
ing internal setting described at Section 4.5.2.
!
CAUTION!
UL listing is not valid for 230 VAC input option.
!
ATTENTION!
Inscription UL n'est pas valide pour l'option d'entrée 230 VAC.
3.2 FEATURES
- Based on switched mode technology and PWM control. Switching frequency:
• SEC-1212 : 20 KHz
• SEC-1223 : 25 KHz
- Compact and lightweight.
- High efficiency and less heat dissipation.
- Protected against short circuit, over current and over voltage
(through PWM controller).
- SEC-1212 is convection cooled. SEC-1223 has forced air cooling and over
temperature shut down.
- UL listed and approved.
- Complies with FCC part 15(B) for radiated & conducted noises for Class-B
digital devices.
3.3 SEC-1212: COOLING
SEC-1212 is cooled by convection. PLACE SEC-1212 UNIT IN A WELL VENTILATED OPEN
AND COOL AREA. DO NOT BLOCK THE VENTILATION OPENINGS ON THE SIDES.
3.4 SEC-1223: COOLING AND OVER TEMPERATURE PROTECTION
SEC-1223 is cooled by convection and by forced air. A temperature controlled fan has
been provided to improve cooling at higher loads. The fan is controlled by a sensor
mounted on the power transformer. THE FAN WILL BE OFF AT LOWER LOADS. It will
come on only when the temperature of the power transformer is ≥ 60ºC ± 5ºC / 140ºF
± 9ºF due to higher loads or higher ambient temperature or poor cool air circulation
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