8
Switching Power Supply S82D
J PARALLEL CONNECTION
(MASTER/SLAVE OPERATION)
The S82D power supply has a built-in current balance function,
allowing two units to be connected in parallel (master/slave
operation) increasing the output current. A maximum of two units
can be connected in parallel.
Master/Slave Operation
When connecting two power supplies for master/slave operation,
use shielded wire to connect the current balance (CB) and -S
terminals as shown below.
In master/slave operation, the power supply with the lower
voltage adjustment set value (controlled by V. ADJ) is the master
unit, and the power supply with the higher voltage adjustment set
value is the slave unit.
Load
(–) (+)
–V
+V
CB –SCB –S
–V
+V
Shielded wire
Note: A maximum of two units can be connected in parallel.
Wiring
Use high capacity wiring between the power supplies and the
load in order to minimize voltage drops due to wire resistance. A
parallel connection kit, sold separately, is available. (Refer to the
Ordering Information section of this data sheet.) The kit includes
a bar to connect the outputs and shielded wire to connect the
current balance and -S terminals.
Power supply
Connection kit
S82D-300 W S82Y-D30A
S82D-600 W S82Y-D60A
Wiring Specifications
When using lead wires, the wires should meet the specifications
in the following table.
Model
Cross sectional area Length
S82D-3005 14 mm
2
min. 30 cm max.
8 mm
2
min. 20 cm max.
S82D-3012 8 mm
2
min. 30 cm max.
5.5 mm
2
min. 20 cm max.
S82D-3024 8 mm
2
min. 50 cm max.
5.5 mm
2
min. 30 cm max.
S82D-6005 20 mm
2
min. 30 cm max.
14 mm
2
min. (2 wires min.) 30 cm max.
S82D-6012 14 mm
2
min. 30 cm max.
8 mm
2
min. (2 wires min.) 30 cm max.
S82D-6024 8 mm
2
min. 30 cm max.
5.5 mm
2
min. (2 wires min.) 30 cm max.
Correct Wiring
To ensure that the voltage drop is the same between each power
supply and load, the length and cross sectional area of the wires
used should be uniform. Wire the system as shown in the figure
below.
Load
(–) (+)
–V
+V
CB–SCB –S
–V
+V
Shielded wire
Load
(–) (+)
–V
+V
CB –SCB –S
–V
+V
Shielded wire
Incorrect Wiring
Do not wire the power supplies as shown below. It would cause
output voltage imbalance: one of the units would supply
excessive current, causing the overload protection to engage.
The result would be an unstable current and a reduction in
product life expectancy.
Load
(–)
(+)
–V
+V
CB –SCB –S
–V
+V
Shielded wire
Adjusting the Output Voltage
(Master/Slave Operation)
Follow the procedure below when adjusting the output voltage of
a master/slave system.
1. Connect the two power supplies in parallel and decide which
unit will be the master.
2. Turn the voltage adjuster (V. ADJ) of the slave unit
completely clockwise.
3. Adjust the voltage adjuster (V. ADJ) of the master unit to the
desired voltage.
4. Slowly turn the voltage adjuster (V. ADJ) of the slave unit
counterclockwise and set the value just before the output
voltage drop.
Note: 1. Set equal output voltages for both power supplies for
safety reasons. If the master power supply stops oper-
ating due to input failure or breakage, the set output
value of the slave power supply will be the output.
2. Even if one power supply fails to operate, both output
LED indicators may be lit if the other power supply is in
operation.
