Caswell SPC-9250 User manual

SPC-9250 SWITCH MODE POWER SUPPLY
USER’S MANUAL
INTRODUCTION
The SPC-9250 Switching Mode CC/CV DC Power Supply provides high power output with its small
size and lightweight. It's suitable for a wide range of applications such as production testing, laboratory,
telecommunication, powering of DC network and etc to provide variable voltages of 1V to 15V under
25A continuous operation.
The ten-turn potentionmeters provide precise output voltage and current control. The 3 digit LED
meters will clear indication of automatic cross over of CC and CV mode provide easy read outs.
Please read through this operation instruction carefully and follow the instructions to prevent from
abuse or misuse. This manual must be kept for reference at anytime in need.
FEATURES
1. Lightweight and Small Size: Switching mode power supply has the advantages of lightweight and
small size. Comparing with linear mode power with the same power output, it is much lighter and
smaller.
2. High Efficiency: The unit is operated with efficiency over 80% under the best condition.
3. The constant current circuit operates to protect against overload and output short circuit. The limiting current
values can be preset in the full range of the rated values.
4. Over Temperature Protection: The over temperature circuitry is functioned when the unit is over a
certain high temperature to prevent the unit from damage by the high temperature. When the circuitry
is functioned, the output voltage and current will drop down to a safety value and the overloaded
indicator will be lighted up.
5. Over Voltage Protection: The over voltage circuitry protect the unit and the loading equipment from damage
by abnormal high output voltage.
6. High RFI Stability: The high protection circuitry against RFI (Radio Frequency Interference) provides
a stable operation.
7. Variable Voltage Output: The variable range of output voltages from 1V to 15V enables good fits
with various uses.
PANEL DESCRIPTION
1. On/Off Switch
2. CC Display : Indicates the unit is in constant current mode
3. CV Display : Indicates the unit is in constant voltage mode
4. Voltmeter 5. Ammeter
6. Output Voltage Adjustment knob 7. Output Current Adjustment knob
8. Cooling Fan Air Intake Window 9. Power Input Connector
10. Fuse Holder 11. Output Terminal
Note: The fixed 13.8Vdc output selection switch is placed at the bottom of unit. It used to select the
output voltage to fixed 13.8V or adjustable output 1-15V (controlled by adjustment knob).

INSTALLATION
1. Make grounding the unit to prevent from electric shock at high voltage caused by leakage or
lightning.
2. DO NOT place the unit in high humid, dusty and/or sunshiny places.
3. Place the unit in a location where allows free air circulation.
4. DO NOT place the unit close the TV sets or CRT monitor.
5. Couple with an AC outlet directly, as source via distribution cables may heat plugs and cable.
6. Put the unit horizontally for accurate meter readings.
Note: For Indoor Use Only.
CAUTION
1. DO NOT use the unit for the equipment requiring higher current input than the designed value
otherwise damages the unit.
2. DO NOT replace the fuse before ceasing problems and the assigned value of fuse must be used in
place.
3. If the external flexible cable or cord of this transformer is damaged, it shall be replaced by a special
cord or assembly available from the manufacturer or his service agent.
SAFETY PRECAUTIONS
1. NEVER remove the metal cover of the power supply while AC power is connected.
2. NEVER touch the unit when your hands are wet.
3. NEVER operate the unit if foreign materials such as metallic objects, water, or other debris have fallen
inside. Contact your dealer for check and repair.
4. NEVER operate the unit that was being damaged, as the voltage regulation circuitry may have been
disabled. The resulting high voltage could damage your equipment.
5. NEVER allow foreign objects to touch the DC Power Output Terminals.
6. If you have the need to inspect the interior of the unit, let it to cool down completely, as some
components may be enough to burn your hand in the event of component failure.
7. NEVER block the cooling fan air intake window.
CONNECTION AND OPERATION
1. Make sure the AC power source fits the input of voltage unit labeled and plug it in the AC outlet.
2. Turn ON the unit and adjust the output voltage to match with the input voltage of the equipment. Then
turn OFF the unit.
3. Connect the equipment to the unit. Red (+) is connected to the positive polarity input of the equipment
and Black (-) is connected to the negative polarity input of the equipment.
4. First turn ON the unit and then turn the equipment ON.
5. When and operation is finished, turn off the equipment first and then turn OFF the unit.
SPECIFICATIONS
SPC-9250
OUTPUT VOLTAGE: 1-15Vdc Adjustable or Fixed 12Vdc (Selectable)
OUTPUT CURRENT: 1 - 25A
RIPPLE AND NOISE: 5mVr.m.s
LINE REGULATION: 50mV (±10% Variation)
LOAD REGULATION: 50mV (0~100% Load)
POWER SOURCE: 120Vac/60Hz~
METER TYPE: Digital LED (±1% +2counts)
DIMENSION (W×H×D): 220 ×110 ×193 (mm)
WEIGHT: Approx. 2.6Kg
Rev. 1.0 03/2007
7673-9205-1270