Desktop Switching Owner's
Manual
Power Supplies
Model:
SEC-1212
SEC-1223
Please read this
manual before
operating your
unit
TABLE OF CONTENTS
Topic
Page
Important safety instructions
2
Description and features
3
Connection and operation
4
Cooling and fan control
4
Battery charging and back up
5
Trouble shooting
5,6
Limiting Electromagnetic Interference
7
Switching Power Supplies & RF Noise
8,9,10
Specifications
11
Warranty
12
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.
IMPORTANT SAFETY INSTRUCTIONS
Please read before using your power supply.
1.) It Is recommended that you return your power supply to a qualified dealer for any
service or repair. Incorrect assembly may result in electric shock or fire.
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 flow 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
accordance with all local codes and ordinances. Never alter the AC cord of plug
provided. If the cord will not fit the outlet, have a proper outlet installed by qualified
electrician. Improper connection can result in risk of electric shock.
DO NOT USE THE POWER SUPLY FOR DIRECT CHARGING OF BATTERY OR
DIRECT CONNECTION TO A BATTERY FOR BATTERY BACK-UP. ( Please read
the section on Battery Back-up ).
2.
DESCRIPTION
SEC-1212/SEC-1223 are switched mode power supplies which convert 120
VAC, 60 HZ to regulated 13.8 VDC based on pulse width modulation
( PWM ) control.
FEATURES
+
BASED ON SWITCHED MODE TECHNOLOGY AND PWM CONTROL
+
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. SEC1223 HAS FORCED AIR
COOLING AND OVER TEMPERATURE SHUT DOWN
+
UL LISTED & APPROVED
+
COMPLIES WITH FCC PART 15(B) FOR RADIATED & CONDUCTED
NOISES FOR CLASS-B DIGITAL DEVICES
3.
CONNECTION AND 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
dia. 0.2”(5mm) with a set screw. For a firm connection, crimp/solder a pin
type copper terminal on the cable ends of your 12V DC device.
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 12 V DC device may now be switched on.
COOLING (SEC-1212)
SEC-1212 is cooled by convection. Operate the unit in a cool, well ventilated space.
COOLING AND 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 above 70ºC due to higher loads. 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 100ºC.
The output voltage will be automatically resumed once the unit cools down.
OPERATE THE 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 .
4.
BATTERY CHARGING AND 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. 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.
TROUBLESHOOTING - GENERAL
PROBLEM : Power ON/OFF switch does not illuminate when turned on.
PROBABLE CAUSE
SUGGESTED REMEDY
No power in the AC outlet
Check there is power in the outlet.
AC side fuse inside the power
supply is blown
Replace the fuse inside the unit.
See fuse ratings at page 11
PROBLEM : AC side fuse blows as soon as power is turned on.
PROBABLE CAUSE
SUGGESTED REMEDY
Unit is defective
Call technical support.
5.
PROBLEM : The output voltage is 0 V or very low
PROBABLE CAUSE
SUGGESTED REMEDY
Input voltage is very low
Check that the input voltage is 120VAC
The unit is in current limit condition
due to overload caused by large reactive
loading or by the output being
short circuited
Check the output terminals are not
shorted. Remove the load. If the output
voltage gets restored, the load is shorted
or is offering large reactive impedance.
Unit is shut down due to over
temp. (SEC-1223)
Check that the fan has not failed or
the vent openings are not blocked
PROBLEM : Output voltage drops as soon as the load is switched on
PROBABLE CAUSE
SUGGESTED REMEDY
The unit is going into current
limit protection mode
Reduce the load current to less than the
current limit value. Motors, pumps,
compressors, relays, incandescent and
halogen lamps and large capacitors in
the input section of the DC devices draw
very high inrush or starting currents of
up to 10 times their normal operating
currents. Ensure that these inrush/
starting currents are below the current
limit value of the power supply.
6.
LIMITING ELECTROMAGNETIC INTERFERENCE (EMI)
This equipment has been tested and found to comply with the
limits for a class B digital device, pursuant to Part 15(B) of the FCC Rules.
These limits are designed to provide reasonable protection against a
harmful interference in a residential installation. This equipment 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 following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to
•
which the receiver is connected.
Consult the dealer or an experienced radio / TV technician for help.
7.
SWITCHING POWER SUPPLIES AND RF NOISE
1.
Switched mode power supplies ( SMPS ) employ high frequency
switching and thus, are a source of radio interference, a recipient of radio
interference and a conduit of radio interference. ( Older linear type transformer based power supplies do not employ high frequency switching
voltages and will be quieter as compared to switching type of supplies ).
2.
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 rectifier, both
rectifier noise and diode recovery. The AC input rectifier / capacitor in the front
end of the switching power supplies ( excepting those with power factor
correction ) are notorious for generating power supply 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.
3.
Switching power supplies are also recipients of radio interference.
The normal operation of the power supply 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
supply’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. Then, if necessary, relocate either the
antenna or the power supply farther apart.
8.
4.
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 these noises 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.
5.
The conducted and radiated noises are limited as per the applicable national / international standards. In North America, the applicable
standard is as per FCC Part 15(B) for Class “B” digital devices. The
European standard is as per EN55022, Class “B” & EN610000-3-2, 3.
Thus, the RF interference is limited but not entirely eliminated.
6.
The conducted RF noise from these power supplies is limited to
the maximum allowable levels by internal filtration. The filtered RF noise
currents ( normally < 5mA ) 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 filtered noise currents are
intentionally leaked to the earth ground. This is termed as the “Earth
Leakage Current”. For safety against electric shock, this earth leakage
current is also required to be limited. It will be seen that these two requirements are conflicting.
NOTE:
In some cases, to prevent electric shock hazard due to
abnormal leakage current (like in marinas, spas, hot
tubs, wet spaces etc.), the AC outlet circuits / receptacles
in these areas are served through a GFCI ( Ground Fault
Circuit Interrupter ). This GFCI is normally set to trip when it
senses an earth leakage current > 5 mA. A single GFCI may
be serving multiple AC outlet circuits / receptacles and
therefore, will be sensing the sum of all the leakage currents
of the devices connected to these. As the switching power
supplies have intentional leakage current as explained above,
it may trip a GFCI feeding multiple AC outlet circuits / receptacles. In such cases, disconnect devices connected to the
other AC outlet circuits / receptacles served by this GFCI.
9.
7.
Following additional guidelines may be followed to reduce
the effects of RF noise:
a.
Use additional appropriate AC radio frequency interference
(RFI) power line filter immediately before the ac input of the
power supply. Recommended: Corcom Inc. ( www.cor.com )
“Q” series. Filtered, ferrite coated cord set
(www.emceupen.com ) is another choice. These cord sets,
with integral line interference filters, 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 filter networks,
the cable conductors are coated with an RF absorbing ferrite
compound. This provides additional attenuation at high frequencies that is lacking in most regular LC filters. The RF absorption of the ferrite-coated cable avoids resonance’s at high
frequencies, reducing the conducted and radiated RF noises
even further
b.
Use additional appropriate DC radio frequency interference
(RFI) power line filter immediately after the DC output of the
power supply. Recommended: Corcom Inc.(www.cor.com )
“DA” / “DC” series
c.
Twist the positive and negative wires from the output of the
power supply to the radio
d.
The DC side positive and negative outputs of these power
supplies are isolated from the chassis. As explained at paragraph 6 above, the noise currents are filtered to the chassis
ground and the chassis ground 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.
e.
Connect a 1/4” wave length of wire on the negative terminal of
the power supply. Connect one end of the wire to the negatvie
terminal and leave the other end free. The wave length corresponds to the wave length of the interfering frequency. (May not
be practical for long wave lengths)
[ Formula: Wave length (Meters) = 300 / frequency in MHz ]
10.
SPECIFICATIONS
INPUT VOLTAGE(nominal)
120 VAC, 60 HZ
OUTPUT VOLTAGE
13.8 VDC
OUTPUT RIPPLE & NOISE (On Full Load)
150 mV PEAK TO PEAK
OUPUT CURRENT,
SEC-1212
SEC-1223
10 A
23A
CURRENT LIMIT
SEC-1212
SEC-1223
14A
25A
COOLING
SEC-1212 - CONVECTION COOLED
SEC-1223 - TEMPERATURE CONTROLLED FAN
PROTECTIONS
OVER CURRENT, SHORT CIRCUIT AND
OVER VOLTAGE (Through PWM Controller)
OVER TEMPERATURE SHUT DOWN (SEC-1223)
ENVIRONMENTAL TEMP. RANGE
SEC-1223
SEC-1212
CONTINUOUS
CONNECTIONS
AC INPUT:
DC INPUT:
0 - 40oC
0 - 30oC
DETACHABLE POWER CORD C/W NEMA 5-15P PLUG
TERMINALS WITH TUBULAR HOLE DIA. 0.2” (5mm)
WITH SET SCREW
FUSE RATING
5 MM X 20 MM GLASS FUSE, 125V or 250 V
(Time Delay / Slow Blow)
Bussmann
Littelfuse
SEC-1212 - 3A
GDC-3
239003
SEC-1223 - 6.3 A
GDC-6.3
21806.3
DIMENSIONS ( W X D X H ), INCHES
7.0 X 8.25 X 2.2
WEIGHT
SEC-1212
SEC-1223
SAFETY CERTIFICATION
3 LBS. NET
3.5 LBS. NET
UL60950-1, E179076
EMC CONFORMITY
FCC Part 15(B), Class B Digital Device
NOTE: SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
11.
3 YEAR Limited Warranty
SEC-1212/SEC-1223 manufactured by Samlex America, Inc. ( the “ Warrantor “ ) are warranted
to be free from defects in workmanship and materials under normal use and service. This
warranty is in effect for 3 years from the date of purchase by the user ( the “ Purchaser “ )
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 material 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.
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, fitness for the ordinary purposes
for which such goods are used, or fitness 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 profit, or any other consequential or resulting damage
which may be claimed to have been incurred through the use or sale of the equipment, 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”)
110-17 Fawcett Road
Coquitlam BC V3K6V2 Canada
(604) 525-3836
12.
Notes:
Attach copy of receipt here:
110-17 Fawcett Rd
T: 604 525 3836
Coquitlam, B.C.
F: 604 525 5221
Canada V3K 6V2
Vesion SEC1212_SEC1223(July2005)
e-mail: samlex@samlexamerica.com
website: www.samlexamerica.com