6 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 7
SECTION 3 | Description & Overview
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 efciency 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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