Mitsubishi FREQROL-E700, Manual

Page: 99 / 108

App.2-5
Appendix
Function name Description Corrective action Display
Major
fault
Brake
transistor
alarm
detection
A fault has occurred in the
brake circuit, such as a
brake transistor breakage.
(In this case, the inverter
must be powered off
immediately.)
Replace the inverter.
Output
side earth
(ground) fault
overcurrent at
start*
2
An earth (ground) fault has
occurred on the inverter's
output side (detected only
at a start).
Remedy the ground fault portion.
Output phase
loss*
3
One of the three phases
(U, V, W) on the inverter's
output side (load side) has
been lost during inverter
operation.
• Wire the cables properly.
• If the motor capacity is smaller than the inverter
capacity, choose the inverter and motor capacities that
match.
External
thermal relay
operation*
2
The external thermal relay
connected to the OH signal
has been activated.
• Reduce the load and operate less frequently.
• Even if the relay contacts are reset automatically, the
inverter will not restart unless it is reset.
Option fault Installation of a
communication option has
been attempted while the
operation is restricted with
the password lock (Pr. 296
Password lock level = "0 or
100").
• To apply the password lock when installing a
communication option, set Pr.296 Password lock level
≠ "0, 100".
• If the problem still persists after taking the above
measure, contact your sales representative.
Communication
option fault
A communication error
has occurred on the
communication line of the
communication option.
• Check the settings of the option functions.
• Connect the built-in option securely.
• Check the connections of the communication cables.
• Connect terminating resistors correctly.
Option fault A fault, such as a contact
fault, has occurred at the
contactor of the inverter
or the plug-in option. The
setting of the switch on the
plug-in option, which is for
manufacturer setting, has
been changed.
• Connect the plug-in option securely.
• Take measures against noises if there are devices
producing excess electrical noises around the inverter.
If the situation does not improve after taking the above
measure, please contact your sales representative.
• Set the switch on the plug-in option, which is for
manufacturer setting, back to the initial setting. (Refer
to the Instruction Manual of each option.)
Parameter
storage
device fault
Operation of the component
where parameters are
stored (control circuit board)
has become abnormal.
• Please contact your sales representative.
• When performing parameter writing frequently
for communication purposes, set "1" in Pr. 342
Communication EEPROM write selection to enable
RAM write. Note that powering OFF returns the
inverter to the status before RAM write.