3.7 Constant current set value external variables
¡
The output current for the constant current can be adjustable by
the external voltage applied to between ITRM and COM on CN3.
Output current will be based on the calculation
2
.
Do not set the external applied voltage of the terminal to -0.3 V or
less, and 5.0 V or more.
When the output current is adjusted to around 0A, the unit might
be unstable.
Load factor of 100% or higher should be avoided since it will be
used outside the specifications.
To change it, you can connect an external resistor or apply voltage
from the outside.
Output current [A] =
X
Rated output current [A]
---2
The voltage between
ITRM and COM [V]
2.5 [V]
3.8 Remote ON/OFF
¡
These models have a remote ON/OFF function.
¡
You can operate the remote ON/OFF function by sending signals
to CN1 or CN2. Specifications are shown in Table 3.1 and connec-
tion examples are shown in Fig. 3.1.
¡
Remote ON/OFF circuit (RC2, RCG) is isolated from input, output,
FG, AUX and various function terminals.
¡
Please note the followings when using the remote ON/OFF func-
tion.
1
The output stops when the current is drawn in RC2.
2
The current flowing into RC 2 is 5mA typ (12mA max).
3
The PG signal turns to “High” when the output voltage is turned
off with remote ON/OFF.
4
AUX can be used even if the output is off with remote control.
5
Even if the output is turned off by remote control, the built-in
fans will continue to operate.
6
Since the contents of this manual are values when using one
unit, pay attention to the necessary current / voltage value when
operating in parallel or in multiple units.
7
If voltage / current other than those shown in Table 3.1 is ap-
plied between RC2 and RCG, the output voltage may not be
output correctly.
Table 3.1 Specifications of remote ON/OFF
Connection method
Fig. 3.1 (a)
Fig. 3.1 (b)
Fig. 3.1 (c)
SW Logic
Output
ON
SW open
(0.1mA max)
SW open
(0.1mA max)
SW close
(0.5V max)
Output
OFF
SW close
(3mA min)
SW close
(3mA min)
SW open
(0.1mA max)
Base pin
RCG
AUXG
RCG, AUXG
AUX
150Ω
12V
RC2
RCG
AUXG
2.2kΩ
RC1
RC1
RC2
R1
V1
2.2kΩ
AUX
AUXG
RCG
150Ω
12V
AUX
150Ω
12V
RC2
RCG
AUXG
2.2kΩ
RC1
(a)
(b)
(c)
SW
SW
SW
(Example: V1=5V, R1=620Ω)
Fig. 3.1 Examples of connecting remote ON/OFF circuit
3.9 Remote sensing
¡
These models have a built-in remote sensing function.
When remote sensing is not used, +S and -S can be left open.
¡
Please see Fig. 3.2 if you do not use the remote sensing function.
Please see Fig. 3.3 if you use the remote sensing function.
¡
When you use the remote sensing function, please wire from +S
and -S on CN1 or CN2. Harnesses are available for your pur-
chase. For details, refer to the item of option parts.
¡
When you use the remote sensing, please note the followings.
1
Wire carefully. When a connection of a load line becomes loose
(due to such factors as loose screw), the load current flows to
the sensing line and internal circuits of the power supply may be
damaged.
2
Use a sufficiently thick wire to connect between the power sup-
ply and the load and keep the line drop at 0.3V or below.
3
Use a twisted pair wire or a shielded wire as the sensing line.
4
Do not draw the output current from +S or -S.
5
When the remote sensing function is used, the output voltage
of the power supply may show an oscillating waveform or the
output voltage may dramatically fluctuate because of an imped-
ance of wiring and load conditions.
Please check and evaluate carefully before using the remote
sensing function.
If the output voltage becomes unstable, we suggest you to try
the followings.
-
Connect C1, R1 and R2.
6
If oscillation occurs because the sensing line is long, adjust with
R1.
Please contact us for details.
AC-DC Power Supplies Enclosed Type
Instruction Manual
PCA-11
