UAF-7
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When not using this function, confirm that terminals are shorted
bS and +M, and between -S and -M with short pieces.
When using this function, wiring should be done without short
pieces.
Devices inside the power supply might be damaged when poor
connection on load lines occurs, e.g. because of loose connector
screws.
Thick wire should be used for wiring between power supply and
load, and line voltage drop should be less than 0.3V.
When long sensing wire is required, use C1, C2 and C3.
Twisted-pair wire or shield wire should be used for sensing wire.
Please do not draw output current from +M, -M terminal.
When remote sensing function is used, output voltage might become
unstable because of a impedance of wiring and load condition.
And the power supply should be evaluated enough. Following are
examples to improve it.
-S sensing wire is removed and terminals between -M and -S
are shorted.
C3 and R1 are connected as above figure.
For a receiving inspection, such as Hi-Pot test, gradually increase
(decrease)the voltage for the start(shut down). Avoid using Hi-Pot
tester with the timer because it may generate voltage a few times
higher than the applied voltage, at ON/OFF of a timer.
Thermal protection is built-in. If this function comes into effect, shut
down the output, eliminate all possible causes of overheating, and
drop the temperature to normal level. Output voltage recovered af-
ter applying input voltage.To prevent the unit from overheating,
avoid using the unit in a dusty, poorly ventilated environment.
2.7 Isolation
2.8 Thermal protection
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Series operation is available by connecting the outputs of two or
more power supplies, as shown below. Output current in series con-
nection should be lower than the lowest rated current in each unit.
Parallel operation is available by connecting the units as shown
below.
As variance of output current drew from each power supply is
maximum 10%, the total output current must not exceed the
value determined by the following equation.
Output voltage in parallel operation is adjustable by using the po-
tentiometer of the ”master” unit. Select one power supply to be
the master, and turn the potentiometer of the other, ”slave” power
supplies, clockwise to the end. Then use the potentiometer of the
mater to adjust output voltage.
When remote sensing is used in parallel operation, the sensing
wire must be connected ONLY to the master. Terminals between
+S&+M and -S&-M of ”slave” power supplies must be shorted.
(a)
(b)
(Output current at parallel operation)
= (the rated current per unit)
(number of unit)
0.9
When the number of units in parallel operation increases, input
current increases at the same time. Adequate wiring design for in-
put circuitry is required, such as circuit pattern, wiring and current
capacity for equipment.
In parallel operation, the maximum operative number of units is 5.
3 Series Operation and
Parallel Operation
UAF
Instruction Manual
AC-DC Power Supplies Enclosed type
June 29, 2011
