Thermistor Trip Function; Signal During Run (Run) - Omron MX2 Series User Manual

7 Other Functions
7-8-7

Thermistor Trip Function

You can provide thermal protection for external equipment such as a motor by connecting a thermistor
installed on it to the inverter and enabling this function.
Connect a PTC thermistor to the inverter. If the resistance of the PTC thermistor becomes approxi-
mately 3 kΩ or more, the inverter will trip (E35).
To have the inverter trip at lower than 3 kΩ, increase the Thermistor Adjustment (C085) value. Con-
versely, to have the inverter trip at higher than 3 kΩ, decrease the C085 value.
Connect the external thermistor between the control terminals S5 and SC and set the Multi-function
Input S5 Selection (C005) to 19 (TH: PTC thermistor thermal protection).
Then, set the adjustment parameter according to the specifications of the thermistor.
When using this function, keep the wiring distance between the motor and the inverter at 20 m or shorter.
Since the current flowing through the thermistor is weak, take measures, such as isolating the thermis-
tor cable, to prevent noise due to the motor current.
Parameter
No.
C085 Thermistor Adjustment
C005 Multi-function Input S5 Selection
Note If no thermistor is connected when C005 is set to 19, a trip will occur.
7-8-8

Signal during RUN (RUN)

The RUN signal will be output from a multi-function output terminal or the multi-function relay output ter-
minal during inverter operation.
This signal turns ON only with the inverter output. The RUN signal is not output even if the RUN com-
mand is input when the frequency is set to 0 Hz. (Note that the RUN LED is lit when the RUN command
is input.)
Allocate the Multi-function Output P1/P2 Selection (C021/C022) or the Multi-function Relay Output (MA,
MB) Function Selection (C026) to 00 (RUN: Signal during RUN).
This signal is also output when DC injection braking is active.
The timing diagram is as follows. The RUN signal remains ON until the motor stops even if the RUN
command (FW) turns OFF.
Parameter
No.
Multi-function Output P1/P2
C021, C022
Selection
Multi-function Relay Output (MA,
C026
MB) Function Selection
Output frequency
FW input (Forward)
RUN output
7 - 80
Function name
0.0 to 200.0
Fine-tune the gain relative to the
input voltage.
19:
Function name
00:
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Data
TH (PTC thermistor thermal
protection)
Data
RUN (Signal during RUN)
Default
Unit
data
100.0 %
−
02 (CF1)
Default
Unit
data
− −