Kikusui PWR401ML - Output Current Control

92 PWR-01
Output Current Control
This section explains how to control the output current using an external voltage (Vext) or an
external variable resistor of approximately 10 kΩ (Rext).
Control using an external voltage (Vext)
To use an external voltage (Vext) to control the output current, set CC control using an exter-
nal voltage or external resistance to on (CF10: ON) in CONFIG settings.
The output current (Io) varies in the range of 0 to the rated output current (Irtg) when the
external voltage (Vext) is changed in the range of 0 V to 5 V (CF12: LO) or in the range of 0 V
to 10 V (CF12:
HI).
External voltage (Vext) connection
Connect a low-noise, stable voltage
source to Vext. The noise in Vext is
multiplied by the amplification factor of
the PWR-01 and appears in the out-
put. Therefore, the output ripple noise
may not meet the specifications of the
PWR-01.
To reduce the influence of noise on the
output, connect a 2-core shielded wire
or a twisted-pair wire across Vext, and
keep the wire as short as possible. If the wiring between the PWR-01 and the external con-
tact is long, it becomes easy for noise to influence the operation of the PWR-01. Even if you
use cables that are designed to suppress noise, the PWR-01 may not operate properly.
If you use a shielded cable, connect the shield to the negative output terminal. If the shield
needs to be connected to the Vext side, see "Notes for Connecting External Voltage
(Vext)"(p.88).
Use pins 11 and 15 of the J1 connector.
W ARNING
Risk of electric shock.
• Ensure that the insulation of Vext or Rext and the connected cable is greater than or
equal to the isolation voltage of the PWR-01. For details on the isolation voltage of
each model, see Chap.7 "Specifications" (p.117).
• When using shielded cables for the connection, protect the uncovered sections of
the shielded cable by using insulation tubes whose withstand voltage is greater than
the PWR-01’s isolation voltage.
External voltage (Vext) 0 V to 5 V (CF12: LO) External voltage (Vext) 0 V to 10 V (CF12: HI)
Io = Irtg×Vext /5 [A]
Vext = 5×
Io / Irtg [A]
Io = Irtg×Vext /10 [A]
Vext = 10×
Io / Irtg [A]
CAUTION
• The signal cable may burn out. Do not connect the Vext output, that is, leave it floating.
Risk of damage.
• Pay careful attention to the polarity of Vext.
• Do not apply a voltage of 10.5 V or greater or a reverse voltage across pins 11 and 15 of
the J1 connector.
2-core shielded wire or
twisted pair wires
Vext
+
–
Output terminal
J1
11
15
PWR-01