Kikusui PLZ-3WH Series, Руководство по эксплуатации

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4-49
Chapter 4: Operating Procedure
4.6.1 External Control of CC (Constant Current) Mode
(a) External voltage method
An external voltage from 0 to approx. 10 V is applied to the load unit to flow the input current in proportion to the
voltage.
7
8
COM
＋
Approx. 10 k Ω
Equivalent circuit
J2
＋
−
Ein
Io ≒ ＋ I SET value
Im × Ein
10
I SET value
：
Set value on the panel
Io
：
Input current
Im ： Rated current
Ein ： External voltage
0 ≦ Ein ≦ 10(V)
Fig. 4.6-2
● ●
● ●
● Setup procedure
(1) Press the [POWER] switch to turn off the load unit.
(2) Connect the external voltage to J2 terminals 7 and 8 on the rear panel.
(3) On the rear panel, set the external control setup switch [SW2] to the “REM” position and [SW3] to the “V”
position.
(4) Press the [POWER] switch to turn on the load unit.
(5) Press the [I SET] key on the front panel to enable the CC mode.
(6) Using the semifixed resistors [OFS] and [FS] on the rear panel, adjust the current offset and maximum current,
respectively.
(7) Using the [SHIFT] + [STOP] (KEYLOCK) keys, put the load unit into keylock condition.
CAUTION
• Up to
±
11 V can be applied between J2 terminals 7 and 8. If the voltage exceeds this value,
the load unit may be damaged. The accuracy cannot be guaranteed when the voltage is at
0 V or below or at 10 V or over.
• The J2 terminal 8 is connected to the negative side of the load terminal inside the load unit.
Take care so that this terminal 8 will not contact any of the other terminals.
When the external voltage is used for external control, the input current is a sum of the current proportional to the
external voltage and the ISET value set on the load unit panel. However, only the ISET value appears on the display,
meaning that the input current is not equal to the ISET value. Therefore, to prevent changing the ISET value
mistakenly, put the load unit into keylock condition.
To prevent noise interference, use twisted pair or shielded signal cable. Also, use a stable external voltage to generate
less noise.
When the external voltage is used for external control, even the CC mode needs the same terminals as the CR mode.
Therefore, always recheck the operating mode.