Fault Definition (Pr. 875) - Mitsubishi Electric FR-A700 Instruction Manual

Operation setting at alarm occurrence

4.18.6 Fault definition (Pr. 875)

When motor thermal protection is activated, an alarm can be output after the motor decelerates to a stop.
Parameter
Name
Number
875 Fault definition
When Pr.875 = "1"
Output
speed
Alarm output
(ALM, ALM2)
Minor fault
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)
272
Initial
Setting
Range
Value
0
0
1
(1) Output is immediately shutoff at occurrence of any
alarm (setting value is "0", initial value)
⋅ Output is immediately shutoff and an alarm output is provided at alarm
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)
ON
(ER) starts the motor to decelerate and an alarm is provided after
deceleration to a stop.
ON
⋅ When the ER signal turns on, decrease load, etc. to allow the inverter
to decelerate.
E.OHT
display
⋅ At occurrence of an alarm other than OHT, THM and PTC, output is
immediately shut off and an alarm is output.
⋅ Set "97 (positive logic) or 197 (negative logic)" in Pr. 190 to Pr. 196 (output
terminal function selection) and assign the ER signal to the output terminal.
⋅ This function is invalid during position control.
Refer to page 236
Description
Normal operation
The motor decelerates to stop when motor thermal protection is activated.
(PTC) is activated, turning on the minor fault output 2 signal
(OHT), motor overload shutoff
(THM) or PTC thermistor