Kikusui PLZ-3WH Series, Operation Manual

Page: 93 / 172

4-53
Chapter 4: Operating Procedure
4.6.3 External Control of CP (Constant Power) Mode
An external voltage from approx. 0 to 10 V is applied to the load unit to change the power.
7
8
COM
＋
Approx.
10k
Ω
Equivalent circuit
J2
＋
−
Ein
Po ≒ ＋ P SET
value
Pm
×
Ein
10
Po
Pm
Ein
P SET value
：
Input power
：
Rated power
：
External voltage
0 ≦ Ein ≦ 10(V)
：
Set value on the panel
Fig. 4.6-8
● ● ● ● ●
Setup procedure
(1) Press the [POWER] switch to turn off the load unit.
(2) Connect the external voltage to J2 terminals 8 and 13 on the rear panel.
(3) Press the [POWER] switch to turn on the load unit.
(4) Press the [P SET] key on the front panel to set the PSET value.
(5) Using the [SHIFT] + [STOP] (KEYLOCK) keys, put the load unit into keylock condition.
CAUTION
• Up to ± 11 V can be applied between J2 terminals 8 and 13. If the voltage exceeds this
value, the load unit may be damaged. Unit 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 working power is a sum of the power proportional to the
external voltage and the PSET value set on the load unit panel. However, only the PSET value appears on the display,
meaning that the working power is not equal to the PSET value. Therefore, to prevent changing the PSET 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.