¡
In PBA600F, 1000F and PBA1500F series, the overvoltage protec-
tion circuit is a tracking method in which the detection point is set
depending on output voltage setting. However, even if a sensing
line makes open or external voltage is applied to output terminal
in order to activate the function at receiving inspection, the track-
ing function does not work, so the function is activated with higher
value in a catalog.
Therefore, do not perform the function test to avoid the any trou-
ble.
2.5 Thermal Protection
¿
PBA300F, PBA600F, PBA1000F and PBA1500F
¡
A thermal protection circuit is built-in.
The thermal protection circuit may be activated under following
conditions and shut down the output.
1
When a current and a temperature continue to exceed the val-
ues determined by the derating curve.
2
When a fan stops or air flow is blocked from the fan and weak-
ens.
If the thermal protection circuit is activated, shut off the input volt-
age and eliminate all the overheating conditions. To recover the
output voltage, have enough time to cool down the unit before
turning on the input voltage again.
2.6 Output Voltage Adjustment
¡
To increase an output voltage, turn a built-in potentiometer clock-
wise. To decrease the output voltage, turn it counterclockwise.
¿
PBA10F, PBA15F, PBW15F, PBA30F,
PBW30F, PBA50F, PBW50F, PBA75F,
PBA100F and PBA150F
¡
We are offering an Option -V, which doesn’t have a built-in poten-
tiometer but instead enables you to adjust the output voltage by
using an external potentiometer (please see 7 Options).
¿
PBA300F, PBA600F, PBA1000F and PBA1500F
¡
The power supplies have an external output voltage control func-
tion. The output voltage can be adjusted within a 110% range
from almost 0V by changing the voltage between the terminal
TRM and the terminal -S on CN1. You can decrease the voltage
by drawing a current from the TRM terminal.
You can calculate the output voltage in this case from formula
1
below.
Please note that the formula
1
gives you only an estimate.
Please contact us if you need accurate numbers.
Output voltage =
X
rated output voltage
---1
Please do not apply an external voltage of -0.7V or less or 3.0V
or more.
There is more than one method to adjust the output voltage, in-
cluding the methods to use external resistors and external power
supplies. Since each method has different characteristic, please
contact us for details.
¡
If the terminal TRM opens while the external output voltage control
function is in use, a unit generates the rated voltage.
If the terminal VB and the terminal -S are connected and the ter-
minal TRM opens as shown in Fig.2.1, the unit stops generating
the output voltage.
¡
You can change the control voltage of TRM from 0 - 2.75V to 0 -
5.5V by serially connecting 1.73
W
to the TRM terminal as shown
in Fig.2.2.
¡
If the output voltage decreases to almost 0V, a fan may stop, out-
put ripple may become large and PG signals may turn to ”High.”
2.7 Remote ON/OFF
¿
PBA10F, PBA15F, PBW15F, PBA30F and
PBW30F
¡
These models do not have a remote ON/OFF function.
¿
PBA50F, PBW50F, PBA75F, PBA100F and
PBA150F
¡
Option -R is available to provide a remote ON/OFF function.
Please see ”7. Options” for details.
¿
PBA300F, PBA600F, PBA1000F and PBA1500F
¡
These models have a remote ON/OFF function.
You can operate the remote ON/OFF function by sending signals
to CN1. Please see Table 2.1 for specifications and Fig.2.3 for
connecting examples.
¡
Remote ON/OFF circuits (RC2 and RCG) are isolated from input,
output, FG and AUX.
¡
Please note the followings when using the remote ON/OFF func-
tion.
1
The output stops when a current flows to RC.
2
The current flown to RC is a 5mA type (maximum 12mA).
Unit type
Instruction Manual
A-36
PB
Unit type
Instruction Manual
A-37
PB
The voltage between
TRM and -S
2.5 [V]
Fig.2.1 Wiring 1
(When TRM control voltage is 0 - 2.75V)
Fig.2.2 Wiring 2
(When TRM control voltage is 0 - 5.5V)
+OUT
CN1
-OUT
+M
+S
VB
-S
TRM
TRM
CB
-S
VB
-S
-M
CN2
+OUT
CN1
-OUT
+M
+S
VB
-S
TRM
TRM
1.73k
W
CB
-S
VB
-S
-M
CN2
(
)
You can also control
voltage externally
through TRM on CN1.
However, we
recommend using TRM
on CN2 just in case
CN1 comes off.
Example of resistor combination
1.6k
W
+ 130
W
1.5k
W
+ 220
W
0 - 110% when
0 - 2.75V
.
0 - 110% when
0 - 5.5V
.
