PLZ-4W Applied Operation 6-51
(2) External resistance control
Connecting an external resistance in the range of 0 to 10 k to the PLZ-4W pro-
duces a resistance that is proportional or inversely proportional to the change.
Proportional control
The external voltage of 0 and 10 k correspond to the maximum and minimum
resistances of the range, respectively.
Inverse proportional control
The external voltage of 10 k and 0 correspond to the maximum and minimum
resistances of the range, respectively.
Connected pins: J1-1 (signal), J1-3 (common)
Fig. 6-30 Equivalent circuit
Fig. 6-31 Control the resistance 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
Gm: Rated conductance
Rin: External variable resistor
0
Rin(k)
10
1
R
0
1
R
0
Rin(k)
10
3
Proportional control
Inverse proportional control
1–
1 mA
MAX12 V
A COM
EXT R/V CONT
§ Gm
§ Gm
Twist
Gm
Gm
0S
External resistor Rin
0
: Rated conductance (S)
Proportional control
Inverse proportional control
: Conductance (before adjustment)
: Conductance (after adjustment)
: Conductance (after adjustment)
10 k
Conductance
Full scale adjustment
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