Mitsubishi Electric FR-D720S SC EC Instruction Manual page 50

Control circuit specifications
Terminal
(Output
5V DC)
Tab. 3-9: Input signals (2)
NOTE Set Pr. 267 and a voltage/current input switch correctly, then input analog signals in accord-
ance with the settings.
Applying a voltage with voltage/current input switch in "I" position (current input is selected)
or a current with switch in"V" position (voltage input is selected) could cause component
damage of the inverter or analog circuit of output devices. Refer to section 6.15 for details.
3 - 14
Name
10
Frequency setting
voltage
power supply
Frequency setting
2
(voltage)
Frequency setting
4
(current)
Frequency setting
5
common
10
PTC thermistor
input
2
Description
Used as power supply when connecting poten-
tiometer for frequency setting (speed setting)
from outside of the inverter.
Rated output voltage: 5V DC
Recommended potentiometer: 1kΩ, 2W linear,
multi turn potentiometer
Inputting 0 to 5V DC (or 0 to 10V) provides the
maximum output frequency at 5V (10V) and
makes input and output proportional. Use
Pr. 73 to switch from among input 0 to 5V DC
(initial setting), 0 to 10V DC.
Inputting 4 to 20mA DC (or 0 to 5V, 0 to 10V)
provides the maximum output frequency at
20mA and makes input and output propor-
tional. This input signal is valid only when the
AU signal is on (terminal 2 input is invalid).
To use terminal 4 (initial setting is current
input), set "4" in any of Pr.178 to Pr.182 to
assign the function, and turn ON AU signal.
Use Pr. 267 to switch from among input 4 to
20mA (initial setting), 0 to 5V DC and 0 to
10V DC. Set the voltage/current input switch in
the "V" position to select voltage input (0 to 5V/
0 to 10V).
Current input
Voltage input
(initial status)
Terminal 5 provides the common reference
potential (0V) for all analog set point values
and for the analog output signals AM (voltage).
The terminal is isolated from the digital circuit's
reference potential (SD). This terminal should
not be grounded. If local regulations require
grounding of the reference potential note that
this can propagate any noise in the ground
potential to the control electronics, thus
increasing sensitivity to interference.
For connecting PTC thermistor output (thermal
motor protection).
When PTC thermistor protection is valid
(Pr. 561 ≠ 9999) terminal 2 is not available for
frequency setting.
Wiring
Rated Refer to
Specifications Page
5.0V DC ± 0,2V,
Permissible
load current
10mA
Input resist-
ance:
10kΩ ± 1kΩ
Maximum
permissible
voltage:
20V DC
Current input:
Input resist-
ance:
249Ω ± 5Ω
Maximum
permissible
6-147
current: 30mA
Voltage input:
Input resist-
ance:
10kΩ ± 1kΩ
Maximum
permissible
voltage:
20V DC
—
PTC thermis-
tor resistance:
6-66
500Ω–30kΩ
(Set by Pr. 561)