PLZ-4WH
93
Controlling Constant Power Mode (CP Mode) Externally
5
Ext
e
rn
al
Cont
rol
an
d Par
a
llel
Oper
at
ion
Doing so enables the external control of CP mode.
6
Turn the power switch off and then on again.
The menu settings are applied.
Control using an external resistance
When you connect an external resistance of 0
Ω
to 10 k
Ω
to the PLZ-4WH, the power varies
proportionally or inversely to the external resistance.
Proportional control: An external resistance of 0
Ω
results in a power of 0 W. An external
resistance of 10 k
Ω
results in a power of 100 % of the specified range.
Inverse control:
An external resistance of 10 k
Ω
results in a power of 0 W. An external
resistance of 0
Ω
results in a power of 100 % of the specified range.
We recommend that the variable resistors that you connect to the PLZ-4WH be resistant to
changes due to temperature and the passage of time. Examples of such resistors include
wire wound and metal film resistors and multi-turn potentiometers. Use resistors that have a
residual resistance of 50
Ω
or less when set to the minimum resistance.
1
If you are performing proportional control, set the resistance to the
minimum value. If you are performing inverse control, set the resistance
to the maximum value.
2
Turn the POWER switch off.
3
Connect the external variable resistor across pins 1 and 3 of the EXT
CONT connector.
4
Turn the POWER switch on, and make sure that the load is off.
5
Set the operation mode and the current.
If you also want to control the current range externally, be sure to set the range to H.
6
From the menu, select “2.Configuration” > “3.External” > “Control.” If
you are performing proportional control, select “R.” If you are
performing inverse control, select “Rinv.”
Doing so enables the external control of CP mode.
7
Turn the power switch off and then on again.
The menu settings are applied.
: Input power (before adjustment)
: Input power (after adjustment)
: Input power (after adjustment)
Proportional control
Inverse control
Full scale
adjustment
Offset adjustment
Pm
Pm
Input power Po
0 W
External resistance Rin
0
Ω
10 k
Ω
: Rated power
1
Rin
3
1 mA
MAX12 V
A COM
EXT R/V CONT
Twist
Po Pm
Po: Input power
Pm: Rated power
Rin: External variable resistor
0 ≤ Rin ≤ approximately 10 k
Ω
Rin (k
Ω
)
10
Po Pm 1−
Rin(k
Ω
)
10
Proportional control
Inverse control
EXT CONT
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