PLZ-4W Applied Operation 6-55
(2) External resistance control
Connecting an external resistance in the range of 0 Ω to 10 kΩ to the PLZ-4W pro-
duces a voltage that is proportional or inversely proportional to the change.
Proportional control
The voltage corresponding to the external resistance of 0 Ω is 0 V; the voltage corre-
sponding to the external resistance of 10 kΩ is 100 % of the specified range.
Inverse proportional control
The voltage corresponding to the external resistance of 10 kΩ is 0 V; the voltage
corresponding to the external resistance of 0 Ω is 100 % of the specified range.
Connected pins: J1-1 (signal), J1-3 (common)
Fig. 6-38 Equivalent circuit
Fig. 6-39 Control the wattage using external resistance
■ The setup procedure is the same as with CC mode.
See page 6-45 “Setup procedure for external voltage control”.
1
J1
Rin
Vo ≈ Vm
Vo: Input voltage
Vm: Rated voltage
Rin: External variable resistor
0 ≤ Rin ≤ approx. 10 kΩ
Rin(kΩ)
10
Vo ≈ Vm
Rin(kΩ)
10
3
Proportional control
Inverse proportional control
1 mA
MAX12 V
A COM
EXT R/V CONT
1–
Twist
Vm
Vm
0 V
External resistor Rin
0 Ω
: Rated voltage
: Input voltage (before adjustment)
: Input voltage (after adjustment)
: Input voltage (after adjustment)
Proportional control
Inverse proportional control
Input voltage Vo
10 kΩ
Offset
adjustment
Full scale adjustment
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