Instruction manual

2-19
Table 2.7 lists the symbols, names and functions of the control circuit terminals. The wiring to the control circuit
terminals differs depending upon the setting of the function codes, which reflects the use of the inverter. Route wires
properly to reduce the influence of noise.
Table 2.7 Symbols, Names and Functions of the Control Circuit Terminals
Classifi-
cation
Symbol
Name
Functions
Analog input
[13]
Power supply
for the
potentiometer
Power supply (+10 VDC) for an external frequency command potentiometer
(Variable resistor: 1 to 5k)
The 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 voltage input.
• 0 to 10 VDC/0 to 100% (Normal operation)
• +10 to 0 VDC/0 to 100% (Inverse operation)
(2) In addition to frequency setting, PID command, PID feedback signal, auxiliary frequency
command setting, ratio setting, torque limiter level setting, or analog input monitor can be
assigned to this terminal.
(3) Hardware specifications
• Input impedance: 22k
• The maximum input is 15 VDC, however, the voltage higher than 10 VDC is handled
as 10 VDC.
• Inputting a bipolar analog voltage (0 to 10 VDC) to terminal [12] requires setting function
code C35 to "0."
[C1]
Analog
setting
current input
(1) The frequency is commanded according to the external current input.
• 4 to 20 mA DC/0 to 100% (Normal operation)
• 20 to 4 mA DC/0 to 100 % (Inverse operation)
(2) In addition to frequency setting, PID command, PID feedback signal, auxiliary frequency
command setting, ratio setting, torque limiter level setting, or analog input monitor can be
assigned to this terminal.
(3) Hardware specifications
• Input impedance: 250
• The maximum input is +30 mA DC, however, the current larger than +20 mA DC is
handled as +20 mA DC.
PTC/NTC
thermistor
input
(1) Connects PTC (Positive Temperature
Coefficient)/NTC (Negative Temperature
Coefficient) thermistor for motor
protection. Ensure that the slide switch
SW5 on the control PCB is turned to the
PTC/NTC position (see section 2.3.6
"Setting up the slide switches").
The figure shown at the right illustrates the
internal circuit diagram where SW5
(switching the input of terminal [C1]
between C1 and PTC/NTC) is turned to
the PTC/NTC position. For details on
SW5, refer to Instruction manual section
2.3.6 "Setting up the slide switches." In
this case, you must change data of the
function code H26.
Figure 2.10 Internal Circuit Diagram
(SW5 Selecting PTC/NTC)
[V2]
Analog
setting
voltage input
(1) The frequency is commanded according to the external voltage input.
• 0 to 10 VDC/0 to 100 % (Normal operation)
• +10 to 0 VDC/0 to 100% (Inverse operation)
(2) In addition to frequency setting, PID command, PID feedback signal, auxiliary frequency
command setting, ratio setting, torque limiter level setting, or analog input monitor can be
assigned to this terminal.
(3) Hardware specifications
• Input impedance: 22k
• The maximum input is 15 VDC, however, the voltage higher than 10 VDC is handled
as 10 VDC.
• Inputting a bipolar analog voltage (0 to 10 VDC) to terminal [V2] requires setting
function code C45 to "0."
[11]
Analog
common
Common for analog input/output signals ([13], [12], [C1], [V2], [FM1] and [FM2]).
Isolated from terminals [CM] and [CMY].