Description & Overview - Samlexpower SEC-1235 Owner's Manual

SECTION 3
3.1 DESCRIPTION
SEC-1235 / SEC-1235M 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: 30.5 KHz
- SEC-1225M comes with Voltmeter and Ammeter
- Compact and lightweight.
- High efficiency and less heat dissipation.
- Protected against short circuit, over current and over voltage
(through PWM controller).
- 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 COOLING AND OVER TEMPERATURE PROTECTION
The units are 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
around the unit. The fan will switch off automatically at ≤ 40ºC ± 5ºC / 104ºF ± 9ºF. In
case the fan fails or the air flow is blocked, a second temperature sensor mounted on
the power transformer will activate over temperature shut down at ≥ 105ºC ± 5ºC /
221ºF ± 9ºF. The output voltage will be automatically resumed once the unit cools down
to ≤ 75ºC ± 5ºC / 167ºF ± 9ºF. PLACE THE UNITS IN A WELL VENTILATED OPEN AND COOL
AREA. DO NOT BLOCK THE OPENINGS AT THE FAN DISCHARGE ON THE BOTTOM AND
THE SUCTION OPENINGS ON THE SIDES.
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