Instruction manual
Remarks :
This product is not good at parallel operation by which the OR
diode is not put because the synchronous rectication method is
used.
¡
Values of l
1
and l
2
become unbalanced by a slight difference of
the output voltage. Make sure that the output voltage of units is of
equal value and the output current from each power supply does
not exceed the rated current.
l
1
, l
2
[
the rated current value
¿
PBA300F, 600F, 1000F, 1500F
¡
Parallel operation is available by connecting the units as shown in
Fig.4.3.
±S, VB and CB are connected mutually in parallel, and ±S and ±M
are connected with CN1 of the master power supply.
When the power supply is shipped out of a factory, special har-
ness (H-SN-19) mounts on CN1 of each power supply.
Remove special harness (H-SN-19) mounted on CN1 of the slave
power supply. Please use optional harnes : H-PA-3 to connect ±S,
VB and CB in parallel.
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 current at parallel operation)
= (the rated current per unit)
X
(number of unit)
X
0.9
¡
When the number of units in parallel operation increases, input
current increases at the same time.
Adequate wiring design for input circuitry is required, such as cir-
cuit pattern, wiring and current capacity for equipment.
¡
In parallel operation, the maximum operative number of units is 5.
¡
Please consult us the harness for a parallel operation.
¡
The wiring impedance of the load from each power supply must
become even so that the output current balance circuit may oper-
ate normally.
4.2 Parallel operation / Master-slave operation
¿
PBA50F, 75F, 100F, 150F
¡
Parallel redundancy operation is available by connecting the units
as shown below.
¡
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 master.
Terminals +S and -S of slave power supplies must be connected
to master.
¡
It is impossible parallel operation with the other model.
¡
The output voltage changes by about 5% in a parallel operation
when one stops by the fail of input side.
¡
When the output current becomes less than 10% of the rated cur-
rent, the PG signal may become High and the fans may stop.
4.3 Parallel redundancy operation
¿
PBA300F, 600F, 1000F, 1500F
¡
N+1 redundancy is possible for reliability.
¡
The system can be operated in a normal power supply even if one
of power supplies breaks down when using in parallel by power
supply number +1 necessary for the system.
¡
Consult us about parallel redundancy.
Unit type
Instruction Manual
A-26
PBA
Unit type
Instruction Manual
A-27
PBA
Fig.4.3 Examples of connecting parallel operation
(The case of PBA1500F)
Fig.4.2 Example of connecting in parallel operation