Mitsubishi Electric FR-A720-0.4K Instruction Manual page 189

Inverter SF-V5RU
*
PC
2W1kΩ G1
CS(OH)
G2
SD
Connection of the thermal
protector of the SF-V5RU
CAUTION
⋅ Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Make
setting after confirming the function of each terminal.
(6) PTC thermistor input (PTC signal)
Inverter
U
AU
V
W
PTC
AU(PTC)
SD
PTC thermistor input connection example
Built-in PTC thermistor of the motor can be input to the PTC signal (AU terminal).
⋅ For the terminal used for PTC signal input, assign the function by setting "63" in Pr. 184 AU terminal function selection
and also set the AU/PTC switchover switch to the PTC terminal function. (The initial setting is the AU terminal
function.)
⋅ If a motor overheat state is detected for more than 10s according to the input from the PTC thermistor, the inverter
shuts off the output and outputs the PTC thermal alarm signal (E.PTC).
⋅ The input specifications of the PTC thermistor
are shown on the right.
CAUTION
⋅ When the PTC signal was not assigned to Pr. 184 and the AU/PTC switchover switch was set to the PTC terminal function, the
function assigned to the AU terminal is always off. Reversely, when the PTC signal was assigned to Pr. 184 and the AU/PTC
switchover switch was set to the AU terminal function, a PTC thermal error (E.PTC) occurs since the function is always in a
motor overheat state.
⋅ When you want to input a current, assign the AU signal to the other signal.
⋅ When terminal assignment is changed, the other functions may be affected. Please make setting after confirming the function
of the AU terminal.
♦ Parameters referred to ♦
Pr. 71 Applied motor Refer to page 180
Pr. 72 PWM frequency selection
Pr. 178 to Pr. 189 (input terminal function selection)
Pr. 190 to Pr. 196 (output terminal function selection)
Specifications of the AU terminal
⋅ A thermal protector is provided for a vector control dedicated motor (SF-V5RU).
* Assign OH (external thermal input) signal to the
CS terminal.
(Pr. 186 = "7")
Connect a 2W1kΩ resistor between the terminal
PC and CS(OH).
Install the resistor pushing it against the bottom
part of the terminal block so as to avoid a contact
with other cables.
Refer to 222 for details of Pr. 186 CS terminal
page
function selection.
Motor
Motor Temperature
Refer to page 273
Refer to page 222
Refer to page 230
Refer to page 27
Selection and protection of a motor
AU
PTC
AU/PTC switchover switch
Factory-set to "AU".
Set to the "PTC" position to
validate the PTC signal input.
PTC Thermistor Resistance Value (Ω)
Normal
Boundary
Overheat
CS(OH)
PC
Control circuit
terminal block
Resistor (2W1kΩ)
Inverter
0 to 500
500 to 4k
4k or higher
179
4