Kikusui PWX750ML, User Manual

Page: 62 / 110

62
PWX
Controlling the Output Current
p.58
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 “Cautions when using the external voltage
(Vext).”
Use pins 21 and 23 of the J1 connector.
Control using an external resistance (Rext)
p.40
By using an external resistance (Rext) to change the reference voltage’s voltage-divider ratio,
you can change the output current (Io) in the range of 0 to the 105 % of the rated output cur-
rent (Irtg).
To use an external resistance (Rext) to control the output current, set the CC control using an
external voltage or an external resistance in the CONFIG settings so that external voltage
control is enabled (CF05: on).
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 (CF07: Lo) or in the range of 0 V
to 10 V (CF07: Hi).
External resistance (Rext) connection
For Rext, use a resistor that is rated at
approximately 10 k
Ω
, 1/2 W or greater,
that has a low temperature coefficient,
and that will change little over time.
Examples of such resistors are metal
film or wire wound resistors.
To reduce the influence of noise on
the output, connect a 2-core shielded
wire or a twisted-pair wire across Rext,
and keep the wire as short as possi-
ble. If the wiring is long, it becomes
easy for noise to influence the opera-
tion of the PWX750ML. Even if you use wires that are designed to suppress noise, the
PWX750ML may not operate properly.
If you use a shielded cable, connect the shield to the negative output terminal.
Use pins 20, 21, and 23 of the J1 connector.
See
See
External voltage (Vext) 0 V to 5 V (CF07: Lo) External voltage (Vext) 0 V to 10 V (CF07: Hi)
Io = Irtg × Vext/5 (in A)
Vext = 5 × Io/Irtg (in A) Io = Irtg × Vext/10 (in A)
Vext = 10 × Io/Irtg (in A)
2-core shielded wire or
twisted-pair wire
Output terminals
J1
20
21
23
PWX
R ext
V ext
Wiper