SamplexPower SEC-1212 User manual

Switch Mode
DC Power
Supplies
SEC-1212
SEC-1223
Please read this
manual BEFORE
installing your
Power Supply.
Owner's
Manual

2 | SAMLEX AMERICA, INC.
SECTION 1
Safety Instructions .................................................................3
SECTION 2
Layout & Dimensions ............................................................4
SECTION 3
Product Overview ..................................................................6
SECTION 4
Troubleshooting Guide ..........................................................8
SECTION 5
Limiting Electromagnetic Interference ..................................9
SECTION 6
Specications ......................................................................12
SECTION 7
Warranty ..........................................................................14
OWNER'S MANUAL | Index

SAMLEX AMERICA, INC. | 3
SECTION 1 | Important Safety Instructions
CAUTION: RISK OF ELECTRIC SHOCK! DO NOT OPEN!
WARNING—TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE. THERE ARE NO USER SERVICEABLE PARTS INSIDE—
REFER TO QUALIFIED SERVICE PERSONNEL.
The following safety symbols will be used in this manual to highlight safety
and information:
WARNING!
Indicates possibility of physical harm to the user in case of non-compliance.
!
CAUTION!
Indicates possibility of damage to the equipment in case of non-compliance.
i
INFO
Indicates useful supplemental information.
Please read before using your power supply:
1. It Is recommended that you return your power supply to a qualied Samlex dealer for
any service or repair. Incorrect assembly may result in electric shock or re.
2. To reduce the risk of electric shock, unplug the power supply from the outlet before
attempting any maintenance or cleaning. Turning off controls will not reduce this risk.
3. An extension cord should not be used unless absolutely necessary. If an extension cord
must be used make sure that the pins on the plug are the same number, size and
shape as those of the original power supply plug.
4. Place the unit in an area that will allow air to ow freely around the unit. DO NOT
BLOCK OR OBSTRUCT vent openings on the side/bottom of the unit.
5. Keep the unit away from moisture and water.
6. NEVER operate the units in parallel.
WARNING!
Your power supply should be grounded to reduce the risk of electric shock. The power
supply is equipped with grounding conductor and grounding plug.
The cord must be plugged into an outlet that is properly installed and grounded in accord-
ance with all local codes and ordinances. Never alter the AC cord of plug provided. If the
cord will not t the outlet, have a proper outlet installed by qualied electrician. Improper
connection can result in risk of electric shock.
DO NOT USE THE POWER SUPPLY FOR DIRECT CHARGING OF BATTERY OR DIRECT
CONNECTION TO A BATTERY FOR BATTERY BACK-UP. (Please read the section on
Battery Back-up).

4 | SAMLEX AMERICA, INC.
SECTION 2 | Layout & Dimensions
Figure 2.1 Layout & Dimensions - SEC-1212
1. Lighted Power ON/OFF Rocker Switch (Lights Red when ON)
2. AC Power Cord Inlet: Type “IEC 320-C14” for detachable power cord with “IEC 320-C13”
connector on one end and NEMA5-15P plug on the other end.
3. Black Negative (-) DC Load Terminal {Tubular hole Dia 5mm/0.2” and set screw (slot head, #10, 24 TPI, 5/16” long)}
4. Red Positive (+) DC Load Terminal {Tubular hole Dia 5mm/0.2” and set screw (slot head, #10, 24 TPI, 5/16” long)}
5. Air inlet slots for cooling fan (cooling fan and air outlet slots at the bottom - not shown)
Dimensions: WxDxH 185 x 208 x 59.5 mm
7.28 x 8.19 x 2.34 in

SAMLEX AMERICA, INC. | 5
SECTION 2 | Layout & Dimensions
Figure 2.2 Layout & Dimensions - SEC-1223
1. Lighted Power ON/OFF Rocker Switch (Lights Red when ON)
2. AC Power Cord Inlet: Type “IEC 320-C14” for detachable power cord with “IEC 320-C13”
connector on one end and NEMA5-15P plug on the other end.
3. Black Negative (-) DC Load Terminal {Tubular hole Dia 5mm/0.2” and set screw (slot head, #10, 24 TPI, 5/16” long)}
4. Red Positive (+) DC Load Terminal {Tubular hole Dia 5mm/0.2” and set screw (slot head, #10, 24 TPI, 5/16” long)}
5. Air inlet slots for cooling fan (cooling fan and air outlet slots at the bottom - not shown)
Dimensions: WxDxH 185 x 208 x 61 mm
7.28 x 8.19 x 2.40 in

6 | SAMLEX AMERICA, INC.
SECTION 3 | Product Overview
DESCRIPTION
SEC-1212 / SEC-1223 are switched mode power supplies which convert 120 VAC, 50/60 HZ
to regulated 13.8 VDC based on pulse width modulation (PWM) control.
Features
- Based on switched mode technology and PWM control. Switching frequency:
• SEC-1212 : 20 KHz
• SEC-1223 : 25 KHz
- Compact and lightweight.
- High efciency 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.
CONNECTION & OPERATION
WARNING!
Before plugging the unit to the AC outlet, please check that your local supply
voltage is 120 VAC.
NOTE! The DC output connector (RED + / BLACK -) has a tubular hole of diameter
0.2” (5mm) with a set screw. For a rm connection, crimp/solder pin type copper
terminal on the cable ends of your 12V DC device (2 Pin Type of terminals have
been supplied with the unit).
Ensure that the power supply’s ON/OFF switch is off and it is unplugged from the AC
outlet. Switch off your 12 V DC device and connect it’s Positive and Negative to the RED
(Positive) and BLACK (Negative) terminals respectively. Ensure that the connections are
secure and tight. Plug the power supply into the AC outlet. Press the ON/OFF switch of the
power supply to ON and observe that the neon indicator in the switch illuminates. If
the indicator fails to light , recheck the connection, AC outlet and the fuse inside the
power supply.
Your 12V DC device may now be switched ON.

SAMLEX AMERICA, INC. | 7
SECTION 3 | Product Overview
COOLING (SEC-1212)
SEC-1212 is cooled by convection. PLACE THE SEC-1212 UNIT IN A WELL VENTILATED OPEN
AND COOL AREA. DO NOT BLOCK THE VENTILATION OPENINGS ON THE SIDES.
Cooling & Fan Control/Thermal Shut Down (SEC-1223)
SEC-1223 is cooled by convection and 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
ow is blocked, a second temperature sensor mounted on the power transformer will ac-
tivate 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 SEC-1223 UNIT 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 .
BATTERY CHARGING & BATTERY BACK-UP
WARNING!
These units are power supplies and not battery chargers. Do not connect these
units directly to a battery.
These units should NOT BE DIRECTLY CONNECTED TO A BATTERY for charging or for
battery back-up. Battery charging and battery back-up may be undertaken only when the
battery is connected through suitable external isolating diodes and charge limiting resistor.
The isolating diode will ensure that the battery does not back power the power supply.
When a battery is deeply discharged, it will initially draw a very large charging current and
thus, will force the power supply into current limit mode for prolonged periods. This is
harmful for the power supply. The charge limiting resistor will limit the charging current,
thereby, ensuring that the maximum charging current is well below the current limit value
of the power supply.
i
INFO
It is recommended that optional battery back-up module BBM-1225 may be used
to convert SEC-1212/SEC-1223 for battery back-up application.

8 | SAMLEX AMERICA, INC.
SECTION 4 | Troubleshooting Guide
OPERATION AS A SIMPLE POWER SUPPLY - ONLY LOAD IS CONNECTED.
NO EXTERNAL BATTERY AND NO BATTERY BACKUP.
Symptom Possible Cause Remedy
ON / OFF Switch is ON
• Switch is NOT lighted
• No DC output
No AC power from the
AC outlet
Internal AC side fuse
is blown
Check AC power is available at the AC
outlet. Breaker feeding the AC outlet may
have tripped.
Open the top cover and check the AC side
fuse. Replace if blown.
If the fuse blows again, the input section is
damaged. Please call Tech Support.
ON / OFF Switch is ON
• Switch is lighted
• No DC output
Unit has shut down due to over
temperature – Temperature of
output transformer windings is:
≥ 105°C ± 5°C / 221°F ± 9°F
(For SEC-1223 only)
Check that the fan is running. If not, the
fan / fan control circuit may have been dam-
aged. Call Tech Support.
Check that the fan suction vents on the
sides of the unit and the discharge vents on
the bottom of the unit are not blocked.
The unit will reset automatically when the
transformer windings cool down to
≤ 75°C ± 5°C / 167°F ± 9°F
ON / OFF Switch is ON
• Switch is lighted
• DC Output voltage
drops
If the voltage loses regulation
and drops to < 13.5V, the unit is
overloaded and is in current limit.
The load is trying to draw ≥ the
current limit value
If the voltage drop is consider-
able with voltage < 2V, the load
side is seeing a short circuit and
short circuit current limited to the
current limit value is being driven
into the short circuit
Reduce the current drawn by the load to
less than the continuous rating.
Switch OFF the load. Remove the short
circuit on the load side.
GFCI outlet / GFCI breaker
supplying AC power to
the unit trips when the
unit is switched ON
Additional RF noise currents from
the unit that are ltered to Earth
Ground increase the net Leakage
Current on the GFCI outlet / GFCI
breaker to > 5mA
Switch OFF other SMPS devices operating
from the same GFCI outlet / GFCI breaker to
reduce the net leakage current to < 5mA
Move the unit to another GFCI outlet / GFCI
breaker that has lesser number of SMPS
load(s) or no SMPS load
Power the unit from normal, non GFCI
outlet or from an outlet not protected by
GFCI breaker

SAMLEX AMERICA, INC. | 9
SECTION 5 | Limiting Electromagnetic Interference
!
CAUTION!
Conducted and radiated noises in this unit are limited as per the applicable National / Inter-
national Standards. In North America, the applicable standard is FCC Part 15(B) for Class “B”
Digital Devices for Residential Installations. The corresponding European standard is EN55022,
Class “B” & EN610000-3-2, 3.
This unit generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions, may cause harmful interference to radio communications.
However, this does not guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the measures recommended in the following paragraphs.
UN-INTENTIONAL RF NOISE GENERATED BY SWITCHED MODE POWER
SUPPLIES (SMPS)
Switched Mode Power Supplies (SMPS) employ high frequency switching (25 KHz in this
unit) and thus, are a source of radio interference, a recipient of radio interference and a
conduit of radio interference. (Older Linear Type, low frequency 50 / 60 Hz transformer
based power supplies do not employ high frequency switching voltages and will be quieter
as compared to SMPS).
The primary emission sources originate in the switching devices due to their fast switching
current transitions: harmonics of the switching frequency and broadband noise created by
under-damped oscillations in the switching circuit. The secondary source is from the bridge
rectier, both rectier noise and diode recovery. The AC input rectier / capacitor in the
front end of the SMPS (excepting those with Power Factor correction) generate power sup-
ply harmonics due to the non-linear input current waveform. The noise is both conducted
and radiated through the input power cord and the DC output wiring to the radio.
FILTRATION OF CONDUCTED NOISE
The conducted RF noise from this SMPS unit is limited to the maximum allowable
levels by internal ltration. The ltered RF noise currents (< few hundred micro Amps) are
bypassed to the chassis of the power supply. The chassis is, in turn, connected to
the Earth Ground pin of the AC input power cord (for Class 1 units). Thus, the ltered
noise currents are intentionally leaked to the Earth Ground. This is termed as the “Earth
Leakage Current”.
EXCESSIVE RF OUTPUT INTERFERENCE BY SMPS DUE TO INCOMING
RF INTERFERENCE WHEN POWERING RADIO TX / RX
SMPS are also recipients of radio interference. The normal operation of the power sup-
ply can be disturbed due to RF noise getting coupled into the power supply. Thus, the
power supply may generate excessive RF noise and lose output voltage regulation due to
excessive transmitter energy being coupled through the AC / DC lines to the power sup-
ply’s regulator feedback path. This may be due to antenna being too close or due to the
antenna or feed system not radiating properly. First check the antenna system SWR.

10 | SAMLEX AMERICA, INC.
SECTION 5 | Limiting Electromagnetic Interference
Then, if necessary, relocate either the antenna or the power supply farther apart. The
receiver may “hear” the power supply. A slowly moving, slightly buzzing carrier heard in
the receiver may be caused by the antenna being too close. As with the transmitter related
noise pick up, a loose coaxial connector or a broken or a missing ground may aggravate
this problem. Normally, this noise will be below the background or “band” noise. Increase
the separation between the power supply and the receiving antenna. Use an outdoor
antenna. This will reduce the amount of signal picked up from the power supply and also
increase the amount of the desired signal.
ADDITIONAL GUIDELINES FOR REDUCING RF NOISE
• Use additional appropriate AC Radio Frequency Interference (RFI) Power Line Filter
rated for minimum 10A immediately before the AC input of the power supply. For
example, consider suitability of Model # 10VN1 from TE Connectivity www.te.com
or similar. Filtered, Ferrite Coated Cord Set is another choice. These cord sets, with
integral line interference lters, reduce Common and Differential Mode Interferences
over a wide frequency range. Because they are shielded, they are also effective against
radiated interferences. In addition to the built-in lter networks, the cable conductors
are coated with an RF absorbing ferrite compound. This provides additional attenua-
tion at high frequencies that is lacking in most regular LC lters. The RF absorption of
the ferrite-coated cable avoids resonances at high frequencies, reducing the conducted
and radiated RF noises even further. For example, consider suitability of EMC Cord
“IMU-14” from EMC Eupen www.emceupen.com or similar.
• Use additional appropriate DC radio frequency interference (RFI) power line lter
rated for minimum 30 A immediately after the DC output of the power supply. For
example, consider suitability of 30A lter Model # “FD10EE030” from Curtis Industries
www.curtisind.com or similar.
• Twist the Positive and Negative wires from the output of the power supply to the radio.
• The DC side Positive and Negative outputs of these power supplies are isolated from
the chassis. As explained earlier, the noise currents are ltered to the chassis of the unit
and the chassis is connected to the Earth Ground through the Earth Ground Pin of the
AC power outlet receptacle. Avoid connecting (referencing) the DC Negative output
terminal of the power supply to the Earth Ground.
• Connect a ¼” wavelength of wire on the Negative terminal of the power supply. Con-
nect one end of the wire to the Negative terminal and leave the other end free. The
wavelength corresponds to the wavelength of the interfering frequency. (May not be
practical for long wave lengths).
[Formula: Wave length (Meters) = 300 / frequency in MHz]
COMBINED FILTERED NOISE CURRENTS FROM MULTIPLE SMPS ON A
BRANCH CIRCUIT MAY TRIP GROUND FAULT CIRUIT INTERRUPTER (GFCI)
During malfunction or an accident, the metal chassis of a device may get energized to
unsafe voltage due to internal high voltage section coming in contact with the chassis.
If a person standing on Earth touches this energized chassis, a leakage current

SAMLEX AMERICA, INC. | 11
SECTION 5 | Limiting Electromagnetic Interference
proportional to the person’s skin resistance will ow through the person’s body to Earth
Ground. The leakage current through the body is higher when the skin contact resist-
ance is lower i.e. if the skin is wet or wounded. This leakage current does not return to
the power source but is dissipated in Earth Ground. A leakage current of > 5mA could
produce lethal electrical shock. Ground Fault Circuit Interrupter (GFCI) is used for safety
against electrical shock due to leakage. GFCI measures the difference between the
current sent to the load and returned from the load and will trip and disconnect the
power circuit if the difference is > 5 mA. GFCIs are normally installed in AC Branch
Circuits feeding power outlets in wet areas like marine craft, RVs, spas, hot-tubs,
kitchens, washrooms, etc.
As explained earlier, RF noise ltration circuits in SMPS generate intentional Earth Leakage
Current. SMPS are used extensively as DC power sources in modern day electrical / elec-
tronic devices e.g. Audio / Video / Computing devices, power supplies, battery chargers etc.
A single GFCI outlet / GFCI breaker may be serving multiple SMPS loads and therefore, will
be sensing the sum of all the Earth Leakage Currents and, if the sum is > 5mA after con-
necting this unit, the GFCI will trip. In such a case, disconnect other SMPS based device(s)
being served by this GFCI one by one till the net leakage current is reduced to < 5mA
and the GFCI does not trip. Other solution is to power this unit from a GFCI outlet / GFCI
breaker that does not have any SMPS load or power from an outlet that is not protected
by GFCI.

12 | SAMLEX AMERICA, INC.
SECTION 6 | Specications
NOTE: Specications are subject to change without notice.
SEC-1212 SEC-1223
AC INPUT
Nominal AC Input Voltage 120 VAC, 60 Hz
Input Current 2.5 A 5.5A
Input Current at No Load 120 mA ± 10% @120VAC
Inrush current at Startup 20A +/- 5A for < 5 ms 30A +/- 5A for < 5 ms
DC OUTPUT
Output Voltage 13.8VDC ± 0.1V
Output Current • Continuous: 10A
• Current Limit: 14A, Auto recovery
• Continuous: 23A;
• Current Limit: 25A, Auto recovery
Output Noise and Ripple < 150 mV Peak to Peak
Peak Efciency 85% +/-5%
DESIGN
Type Switch Mode Power Supply (SMPS) with Fixed Frequency Pulse Width Modu-
lation (PWM)
Output Side Switching
Frequency 20 KHz 25 KHz
PROTECTIONS
Short Circuit, Overload Constant Current Limiting at 14A;
Auto Reset
Constant Current Limiting at 25A;
Auto Reset
Over Voltage Regulated by PWM Controller
Over Temperature Cooled by convection. No protection
is necessary
Output shuts down when Power
Transformer winding temperature ≥
105°C ± 5°C / 221°F ± 9°F; Auto reset
on cooling down to ≤ 75°C ± 5°C /
167°F ± 9°F
COOLING
Type of cooling Convection – No fan
Temperature controlled fan. ON
when Power Transformer winding
temperature is ≥ 60°C ± 5°C / 140°F
± 9°F; OFF when cools down to ≤
40°C ± 5°C / 104°F ± 9°F
FUSE
Internal AC Side Fuse,
120VAC Input
• 5 mm x 20 mm Glass Fuse
• 250V, 3A, Time Delay Type
• LittelFuse - “239003”
• 5 mm x 20 mm Glass Fuse
• 250V, 6.3A, Time Delay Type
• LittelFuse - “21806.3”

SAMLEX AMERICA, INC. | 13
SECTION 6 | Specications
NOTE: Specications are subject to change without notice.
SEC-1212 SEC-1223
COMPLIANCE
Safety
UL safety listed as “Information Technology Equipment Power Supply” for
USA (UL Standard ANSI/UL-60950-1) and for Canada (CSA Standard CAN/
CSA-C22.2 No. 60950-1)
Electro Magnetic Interfer-
ence EMI – Radiated &
Conducted
FCC Part 15(B), Class B
INPUT / OUTPUT CONNECTIONS
AC Input Connection
• “IEC 320-C14” Inlet Connector on the unit
• Detachable Power Cord with:
• “IEC 320-C13” Connector on one end
• NEMA5-15P Plug on the other end
DC Output Connectors Terminal with Tubular Hole - Diameter 5mm / 0.2” and set screw (#10, 24
TPI, 5/16” long)
ENVIRONMENTAL
Operating Temperature
Range 0°C / 32°F to 30°C / 86°F 0°C / 32°F to 40°C / 104°F
DIMENSIONS AND WEIGHT
Dimensions (W x D x H) 185 x 208 x 59.5 mm 185 x 208 x 61 mm
7.28 x 8.19 x 2.34 in 7.28 x 8.19 x 2.40 in
Weight 1.36 kg 1.6 kg
3.0 lb 3.5 lb

14 | SAMLEX AMERICA, INC.
SECTION 7 | Warranty
3 YEAR LIMITED WARRANTY
SEC-1212/SEC-1223 manufactured by Samlex America, Inc. (the “Warrantor“) is warranted
to be free from defects in workmanship and materials under normal use and service. The
warranty period is 3 years for the United States and Canada, and is in effect from the date
of purchase by the user (the “Purchaser“).
Warranty outside of the United States and Canada is limited to 6 months. For a warranty
claim, the Purchaser should contact the place of purchase to obtain a Return Authorization
Number.
The defective part or unit should be returned at the Purchaser’s expense to the authorized
location. A written statement describing the nature of the defect, the date of purchase,
the place of purchase, and the Purchaser’s name, address and telephone number should
also be included.
If upon the Warrantor’s examination, the defect proves to be the result of defective mate-
rial or workmanship, the equipment will be repaired or replaced at the Warrantor’s option
without charge, and returned to the Purchaser at the Warrantor’s expense. (Contiguous US
and Canada only).
No refund of the purchase price will be granted to the Purchaser, unless the Warrantor is
unable to remedy the defect after having a reasonable number of opportunities to do so.
Warranty service shall be performed only by the Warrantor. Any attempt to remedy the
defect by anyone other than the Warrantor shall render this warranty void. There shall
be no warranty for defects or damages caused by faulty installation or hook-up, abuse or
misuse of the equipment including exposure to excessive heat, salt or fresh water spray, or
water immersion.
No other express warranty is hereby given and there are no warranties which extend
beyond those described herein. This warranty is expressly in lieu of any other expressed
or implied warranties, including any implied warranty of merchantability, tness for the
ordinary purposes for which such goods are used, or tness for a particular purpose, or any
other obligations on the part of the Warrantor or its employees and representatives.
There shall be no responsibility or liability whatsoever on the part of the Warrantor or its
employees and representatives for injury to any persons, or damage to person or persons,
or damage to property, or loss of income or prot, or any other consequential or resulting
damage which may be claimed to have been incurred through the use or sale of the equip-
ment, including any possible failure of malfunction of the equipment, or part thereof. The
Warrantor assumes no liability for incidental or consequential damages of any kind.
Samlex America Inc. (the “Warrantor”)
www.samlexamerica.com

NOTES

Contact
Information
Toll Free Numbers
Ph: 800 561 5885
Fax: [phone]
Local Numbers
Ph: 604 525 3836
Fax: [phone]
Website
www.samlexamerica.com
USA Shipping Warehouse
Kent WA
Canadian Shipping Warehouse
Delta BC
Email purchase orders to
[email protected]
11001-SEC-1212-1223-1114