SamplexPower SEC-1212 - User Manual

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DC Power

Supplies

SEC-1212

SEC-1223

Please read this

manual BEFORE

installing your

Power Supply.

Owner's

Manual

Table of Contents

Questions and Answers

G
Grant WuJul 27, 2025
What to do if the DC output voltage drops on my SamplexPower SEC-1212?
- D
  davidcarterJul 27, 2025
  If the voltage on your SamplexPower Switch drops below 13.5V, it means the unit is overloaded and in current limit. The load is drawing more current than the unit can continuously provide. If the voltage drops significantly, below 2V, there's likely a short circuit on the load side. To resolve this, reduce the current drawn by the load to less than the continuous rating, switch off the load, and remove any short circuits.
C
Christopher RandolphAug 2, 2025
Why is my SamplexPower Switch lighted but has no DC output?
- G
  Gregory DorseyAug 3, 2025
  The SamplexPower Switch might have shut down due to overheating. Specifically, the output transformer windings' temperature might be too high (≥ 105°C ± 5°C / 221°F ± 9°F for SEC-1223 only). Check if the fan is running; if not, the fan or its control circuit may be damaged, and you should call Tech Support. Also, ensure that the fan suction vents on the sides and the discharge vents on the bottom of the unit are not blocked. The unit should automatically reset once the transformer windings cool down to ≤ 75°C ± 5°C / 167°F ± 9°F.
C
Christopher Dyer IIIAug 11, 2025
How to fix a SamplexPower Switch that is on but not lighted and has no DC output?
- D
  David BlackburnAug 11, 2025
  First, ensure that the AC outlet has power, as the breaker might have tripped. Then, open the top cover and inspect the AC side fuse; replace it if it's blown. If the fuse blows again immediately, the input section is likely damaged, and you should contact Tech Support.
W
Wayne GonzalezAug 18, 2025
Why does my SamplexPower SEC-1212 trip the GFCI outlet?
- J
  Jason WatsonAug 18, 2025
  The GFCI outlet or breaker might be tripping because of increased RF noise currents from the SamplexPower Switch, which raises the net leakage current above 5mA. Try switching off other SMPS devices connected to the same GFCI outlet or breaker to reduce the total leakage current below 5mA. Alternatively, move the unit to a different GFCI outlet or breaker with fewer or no SMPS loads. As another option, power the unit from a normal, non-GFCI outlet or one not protected by a GFCI breaker.

Summary

Important Safety Instructions

Layout & Dimensions

Lighted Power ON;OFF Rocker Switch

Describes the power switch with an integrated red light.

AC Power Cord Inlet

Details the IEC 320-C14 connector for the detachable power cord.

Black Negative DC Load Terminal

Identifies the negative DC output terminal with a set screw.

Red Positive DC Load Terminal

Identifies the positive DC output terminal with a set screw.

Air inlet slots for cooling fan

Shows locations for air intake essential for cooling the unit.

Product Overview

Connection and Operation

Details how to connect the power supply and operate it safely.

Cooling (SEC-1212)

Explains the convection cooling method for the SEC-1212 model.

Cooling & Fan Control;Thermal Shut Down (SEC-1223)

Describes cooling and thermal shutdown features for the SEC-1223 model.

Battery Charging & Battery Back-up

Warns against direct battery connection and advises on back-up usage.

Troubleshooting Guide

Limiting Electromagnetic Interference

Unintentional RF Noise Generated by Switched Mode Power Supplies

Explains the source of RF noise from SMPS technology.

Filtration of Conducted Noise

Details how conducted RF noise is filtered and bypassed to Earth Ground.

Excessive RF Output Interference by SMPS

Discusses RF interference impacting SMPS operation and output.

Additional Guidelines for Reducing RF Noise

Provides recommendations for mitigating RF noise issues.

Combined Filtered Noise Currents from Multiple SMPS

Explains how SMPS noise can trip GFCI breakers.

Specifications

AC Input

Details input voltage, current, and inrush current specifications.

DC Output

Specifies output voltage, current, and noise/ripple levels.

DESIGN

Describes the power supply type and switching frequency.

PROTECTIONS

Outlines built-in protections like short circuit and over voltage.

COOLING

Specifies the cooling method for each model.

FUSE

Lists the type and rating of the internal AC side fuse.

COMPLIANCE

Details safety listings and EMI compliance standards.

INPUT; OUTPUT CONNECTIONS

Describes the AC input and DC output connector types.

ENVIRONMENTAL

Specifies the operating temperature range for the units.

DIMENSIONS AND WEIGHT

Provides physical dimensions and weight for both models.

Warranty

SamplexPower SEC-1212 Specifications

General

Brand	SamplexPower
Model	SEC-1212
Category	Switch
Language	English