Cosel PBA1000F Instruction Manual Download Page 7

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Synchronous rectification method is employed for these products

and therefore you cannot use them in parallel operation without
OR diode.

Even a slight difference in output voltage can affect the balance
between the values of I

and I

Please fine-tune the output voltage so that a current from each
power supply does not exceed its rated current and a balance
among output current values is kept.

, l

[

rated current value

PBA300F, PAB600F, PBA1000F and PBA1500F

You can use the power supplies in parallel operation by connect-
ing units as shown in Fig.4.3.
Please parallelly connect ±S, VB and CB of each power supply in
parallel operation and connect ±S and ±M on CN1 of the master
power supply.
When the power supplies are shipped from a factory, they come
with a dedicated harness (H-SN-19) being mounted on CN1.
Please remove the dedicated harness (H-SN-19), which is mount-
ed on CN1 of the slave power supply, and use an optional har-
ness, H-PA-3, to connect ±S, VB and CB parallelly.
Differences in the output current values among the power supplies
in parallel connection are 10% at most. Please make sure that
the sum of the output current values does not exceed a value ob-
tained from the right side of the following equation.

(Output current in parallel operation)
= (Rated current per unit)

(Number of units)

0.9

When the number of units in parallel operation increases, the in-
put current also increases. Please design input circuitry (including
circuit pattern, wiring and current capacity for equipment) carefully.

Please make sure that the wiring impedance of a load from each
power supply becomes even. Otherwise, the output current bal-
ance circuit may become inoperative.

The maximum number of units you can use in parallel operation is
5.

4.2 Parallel Operation/Master-slave Operation

PBA10F, PBA15F, PBW15F, PBA30F,

PBW30F, PBA50F, PBW50F, PBA75F,

PBA100F and PBA150F

You can use the power supplies in parallel operation by connect-
ing units as shown below.

You can adjust the output voltage in parallel operation by adjusting
a potentiometer of just one power supply.
To do so, select one power supply as the master unit and turn the
potentiometers of the other (slave) power supplies clockwise to
the end.
Once you have done this, you can adjust the output voltage by
turning the potentiometer of the master unit.

If you use the remote sensing function in parallel operation, con-
nect paraS and -S of slave power supplies must be con-
nected to master and connect the sensing wire from the master
unit to the load.

You cannot parallelly operate power supplies with different output
voltage or electrical power.

If an output stops (through the remote ON/OFF circuit or due to
an input shutoff or failure) in parallel operation, the LED of the
stopped unit lights off.

When the load becomes 10% or less of the rated current, the PG
signals may turn ”High” and the fan may stop. In this case, the
LED also lights off.

4.3 N+1 Parallel Redundancy Operation

PBA300F, PAB600F, PBA1000F and PBA1500F

You can have N+1 redundancy operation for improved system reli-

ability.

If you add one extra power supply in parallel operation, even if

one of the power supplies in your system fails, the remaining non-
failed power supplies continue to sustain the system. If one of the
power supplies stops operating, the output voltage may change
about 5%.

If you have any questions about series, parallel and N+1 redun-
dancy operations, please contact us.

Unit type

Instruction Manual

A-38

Unit type

Instruction Manual

A-39

Fig.4.3 Example of parallel connection

(PBA1500F)

Fig.4.2 Example of connecting in parallel operation

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