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2-12
Table 2.8 Symbols, Names and Functions of the Control Circuit Terminals
Classifi-
cation
Symbol Name
Functions
[13] Power
supply for
potenti-
ometer
Power supply (+10 VDC) for an external frequency command potentiometer
(Potentiometer: 1 to 5 k
Ω
)
A potentiometer of 1/2 W rating or more should be connected.
[12] Analog
setting
voltage
input
(1) The frequency is commanded according to the external analog input
voltage.
0 to +10 (VDC)/0 to 100 (%) (Normal operation)
+10 to 0 (VDC)/0 to 100 (%) (Inverse operation)
(2) Used for reference signal (PID process command) or PID feedback
signal.
(3) Used as additional auxiliary setting for various main frequency com-
mands.
* Input impedance: 22 k
Ω
* The allowable maximum input is +15 VDC; however, the voltage higher
than +10 VDC is treated as +10 VDC.
[C1] Current
input
(1) The frequency is commanded according to the external analog input
current.
+4 to +20 mA DC/0 to 100% (Normal operation)
+20 to +4 mA DC/0 to 100% (Inverse operation)
+0 to +20 mA DC/0 to 100% (Normal operation)
+20 to 0 mA DC/0 to 100% (Inverse operation)
(2) Used for reference signal (PID process command) or PID feedback
signal.
(3) Connects PTC (Positive Temperature Coefficient) thermistor for motor
protection.
(4) Used as additional auxiliary setting for various main frequency com-
mands.
* Input impedance: 250
Ω
* The allowable maximum input is +30 mA DC; however, the current
larger than +20 mA DC is treated as +20 mA DC.
Analog i
nput
[11] Analog
common
Common terminal for analog input and output signals
This terminal is electrically isolated from terminals [CM] and [Y1E].