Fault Definition (Pr. 875) - Mitsubishi Electric FR-A760 Series Instruction Manual

4.18.6 Fault definition (Pr. 875)

When motor thermal protection is activated, a fault can be output after the motor decelerates to a stop.
Parameter
Name
Number
875 Fault definition
When Pr.875 = "1"
Output
speed
Fault output
(ALM, ALM2)
Alarm
output 2
(ER)
OHT
occurrence
CAUTION
⋅ The value "0" is recommended for the system in which the motor continues running without deceleration due to a large torque
on the load side.
⋅ Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection) may affect the other functions. Make
setting after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 190 to Pr. 196 (output terminal function selection)
Initial
Setting
Range
Value
0
0
1
(1) Inverter trips immediately shutoff at occurrence of any
alarm (setting value is "0", initial value)
⋅ Inverter trips immediately and a fault signal output is provided at fault
occurrence.
(2) The motor decelerates to stop when motor thermal
protection is activated (setting value is "1")
⋅ When external thermal relay
(electronic thermal relay function)
starts the motor to decelerate and a fault is provided after deceleration
ON
to a stop.
⋅ When the ER signal turns on, decrease load, etc. to allow the inverter
to decelerate.
ON
⋅ At occurrence of a fault other than OHT, THM and PTC, inverter trips
immediately and a fault signal is output.
E.OHT
⋅ Set "97 (positive logic) or 197 (negative logic)" in Pr. 190 to Pr. 196 (output
display
terminal function selection) and assign the ER signal to the output terminal.
⋅ This function is invalid during position control.
Refer to page 225
Operation setting at alarm occurrence
Description
Normal operation
The motor decelerates to stop when motor thermal protection is activated.
(PTC) is activated, turning on the alarm output 2 signal (ER)
(OHT), motor overload trip
(THM) or PTC thermistor
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