GW Instek SPS-1230 User manual

INSTRUCTTIONS OF USING DC POWER
SUPPLY SPS-1230
I. PANEL CONTROL AND INDICATORS

Fig. 1 Front panel
Fig. 2 Rear panel
Output value
indicator
CC indicator
Fuse holder
Power socket
Ground
terminal
“-” output
terminal
“+” output
terminal
MAX.3A output
terminals
CV indicator
Voltage knob
Power Switch
Current knob
AC select switch

II. PRECAUTIONS BEFORE OPERATION
Before connecting the power plug to an AC line outlet, make sure the
voltage selector of the rear panel is set to the correct position and the
proper fuse installed corresponding to the line voltage.
AC input should be within the range of line voltage ±
±±
±15%, 50/60Hz
If the fuse blown, the CV or CC indicators will not light and the power
supply will not operate. The fuse SHOULD NOT normally blow unless a
problem has developed in the unit. Try to determine and correct cause of
the blown fuse, the replace only with a fuse of the correct rating and type.
The normal ambient temperature range of this instrument is from 0oto
40oC.
Do not use the instrument in a place where strong magnetic or electric
field exists as it may disturb the measurement.
To avoid electrical shock, the power cord protective grounding conductor
must be connect to the ground.
The machine itself is a heat source, please don’t pile up the machine
while operation. Keep the machine from other heating source at least for
10cm. In addition, the heat sink located at rear of the power supply must
have sufficient space for radiation.
III. OPERATIONAL STEPS
Step 1: Set Power switch to “OFF” position.
Step 2: Make sure that line voltage is correct for the input power voltage.
Step 3: Plug power cord into the AC power outlet.
Step 4: Set Power switch to “ON” position.
Step 5: Adjust “Voltage” and “Current” control to the desired output voltage
and current (see section IV).
Step 6: Connect the external load to the output binding posts. Make sure both
“+” and “-” terminals are connected correctly.

IV. STEPS FOR SETTING CURRENT LIMIT
(1) Determine the maximum safe current for the device to be powered.
(2) Temporarily short the (+) and (-) terminals of the power supply together
with the test lead (For safety assurance, please select the adequate output
test lead according to Table 1).
(3) Rotate the COARSE VOLTAGE control away from zero sufficiently to
have the CC indicator lightened.
(4) Adjust the CURRENT control for the desired current limit. Read the
current value on the Ammeter.
(5) The current limit (overload protection) has now been preset. Do not
change the CURRENT control setting after this step.
(6) Remove the short between the (+) and (-) terminals. The power supply
returns to the constant voltage mode and is ready to use.
Table 1. Output Test Lead selection
Conductor Maximum
Conductive
Resistor (Ω/km)
Permissible
Current A(amp)
Wire No.
AWG
Cross section Area
(mm2)
Outer Diameter
(mm)
24 0.22 0.64 88.6 7.64
22 0.34 0.78 62.5 10.0
20 0.53 0.95 39.5 13.1
18 087 1.21 24.4 17.2
16 1.32 1.53 15.6 22.6
14 2.08 2.03 9.90 30.4
12 3.29 2.35 6.24 40.6
10 5.23 3.00 3.90 55.3