Kikusui PWX750ML, User Manual

Page: 60 / 110

60
PWX
Controlling the Output Voltage
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 22 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 voltage (Eo) in the range of 0 to the 105 % of the rated output volt-
age (Ertg).
To use an external resistance (Rext) to control the output voltage, set the CV control using an
external voltage or an external resistance in the CONFIG settings so that external voltage
control is performed (CF06: on).
The output voltage (Eo) varies in the range of 0 to the rated output voltage (Ertg) 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 the external resistance (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 possible. If
the wiring between the PWX750ML
and the external contact is long, it becomes easy for noise to influence the operation of the
PWX750ML. Even if you use cables 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, 22, 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)
Eo = Ertg × Vext/5 (in V)
Vext = 5 × Eo/Ertg (in V) Eo = Ertg × Vext/10 (in V)
Vext = 10 × Eo/Ertg (in V)
2-core shielded wire or
twisted-pair wire
Wiper
Output terminals
J1
20
22
23
PWX
R ext
V ext