External Device (Peripherals) Malfunctions - Mitsubishi FR-A700 Series Instruction Manual

3.4.6

External device (peripherals) malfunctions

Causes related to overcurrent relay
Cause
Current is large.
Leakage current is large.
The overcurrent relay (OCR) setting is
small.
Causes related to the earth leakage current breaker
Cause
Leakage current is large.
The rated sensitivity current of the earth
leakage current breaker is small
Other causes
Cause
The setting value of PWM frequency
selection (Pr. 72) is too large.
Electromagnetic interference
Misoperation caused by undesirable
currents when a programmable controller
is connected.
Measures
Excecute trouble shooting of "Motor current is large"
(1) Decrease the setting value of PWM frequency selection (Pr. 72).
[FR-A700 and FR-F700]
(2) Connect the EMC filter ON/OFF connector to OFF.
Set a value 1.1 times of 60Hz rated current.
Measures
(1) Decrease the setting value of PWM frequency selection (Pr. 72).
(2) Use a breaker designed for harmonic and surge suppression
(3) Use a low-permittivity cable.
(4) Shorten the wiring length between the motor and inverter.
[FR-A700 and FR-F700]
(5) Connect the EMC filter ON/OFF connector to OFF.
Increase the rated sensitivity current of the earth leakage current
breaker.
Measures
Decrease the setting value of PWM frequency selection (Pr. 72).
(1) Separate a signal cable from a power cable.
(2) Install a common mode filter.
(3) Use a twisted pair cable
(4) Route wires using metal conduit.
[FR-A700 and FR-F700]
(5) Connect the EMC filter ON/OFF connector to OFF.
Use terminal PC as a common terminal, and perform wiring.
Details of troubleshooting
Parameters
(1) Pr. 72
Parameters
(1) Pr. 72
Parameters
Pr. 72
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