External Trip (Ext); Thermistor Trip Function - Omron 3G3MX2 User Manual

5-9 Functions Relating to Protections, Warnings and Various Output Signals

External Trip (EXT)

Use this function to trip the Inverter via an error signal generated from a peripheral system. In
this case, allocate "12: EXT" to any Multi-function Input Selections (C001 to C007).
When the EXT terminal is turned ON, E12 is displayed and the Inverter trips to shut off the
output.
When the Inverter has tripped, indicating E12, the trip will not be reset even if the error signal
from external equipment is reset (EXT terminal is turned OFF).
To reset the trip, perform the reset operation or turn the power off and on again.
Parameter
No.
C001 to C007
Do not turn on the EXT terminal after shutting off the power. The fault monitor data may not be
stored correctly.
RUN command FW, RV
EXT terminal input
Motor rotation speed
RS (reset) input
AL output
(alarm signal)

Thermistor Trip Function

This function enables thermal protection of the external equipment (e.g. motor) if its internal
thermistor is connected to the Inverter.
Connect a PTC thermistor. The Inverter will be tripped (E35) when the resistance of the PTC
thermistor exceeds approximately 3 kΩ.
To trip the Inverter at less than 3 kΩ, increase the value of C085. To trip the Inverter at greater
than 3 kΩ, decrease the value of C085.
Wire the external thermistor between control terminals S5/TH and SC and allocate TH to Multi-
function Input Terminal S5 (C005 = 19: TH).
Set the following functions according to the specifications of your thermistor.
When this function is used, keep the cable length between the motor and Inverter within 20 m.
Since the current flowing through the thermistor is weak, consider separating the wires, etc. to
prevent noise due to motor current.
Parameter
No.
C085
C005
Note: If "Thermistor" is allocated to C005 but no thermistor is connected, a trip occurs.
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-A@@@@)
Function name
Multi-function 12: EXT (External trip)
Input Selection
Function name
Thermistor 0.0 to 200.0.
Adjustment The gain of input voltage is fine-tuned.
Multi-function 19: TH (PTC thermistor thermal
Input Selection protection)
Default
Data
setting
Free run
Default
Data
setting
100.0
02(CF1)
Unit
− −
Unit
%
−
5-120
5