Protective Functions
FR-E 500 EC
25
Error message
Meaning
Description
Remedy
Display
FR-PU04
Display
FR-PA02-02
Br. Cct.
Fault
Brake
transistor failure
A) The integrated brake transis-
tor does not operate properly.
B) Possibly, a thermal overload
occured.
Check the relative operating
time of the brake resistor. In
case of thermal difficulties
use an external brake resistor
or an inverter of higher capa-
city.
Ground
Fault
Ground failure
An overcurrent occured due to a
ground failure upon the inverter
output (load side).
Check load connections
(motor circuit).
OH Fault
Activation of an
external motor
protection relay
( t h e r m a l c o n-
tact)
An external motor protective
switch was activated. If an exter-
nal motor protective switch for
thermal monitoring is used, this
switch can activate the protecti-
ve function of the inverter.
Check motor load and drive.
Stll
Prev STP
Stall prevention
overload
A long lasting excess of the cur-
rent limit (OL display) shuts
down the inverter.
Reduce the load. Check the
preset values for the current
limit (parameter 22) and the
stall prevention selection
(parameter 156).
Option
Fault
Error in an
optional unit
A dedicated inboard option does
not operate properly. The protec-
tive function is activated, if an in-
ternal option is improperly instal-
led or connected.
Check connections and con-
nectors of the optional unit.
Corrupt
Memry
Memory error
Error on access of the data me-
mory of the inverter.
Please contact your nearest
MITSUBISHI ELECTRIC re-
presentative if the error oc-
curs again.
PU Leave
Out
Control panel
connection error
A connection error between in-
verter and control panel occur-
red during operation.
This alarm is only returned, if
parameter 75 is set to “2”, “3”,
“16”, or “17”.
Check the connection of con-
trol panel.
Retry No
Over
Automatic
restart retry
exceeded
After activation of a protective
function the inverter failed to be
restarted automatically within
the number of retries specified
in parameter 67.
Remedy the actual cause of
the originary protective functi-
on.
CPU
Fault
CPU error
Failure on CPU printed circuit
board.
Contact the MITSUBISHI
ELECTRIC customer ser vice
Fault 3
Fault 3
(option error)
The dedicated option used in
the inverter results in setting er-
ror or connection fault.
Check the function setting of
the option board.
Check that the communicati-
on option is plugged in the
connector securely
Fault 6
CPU errorr
This functions stops the inverter
output if a communication error
occurs in the built-in CPU.
Please contact your nearest
MITSUBISHI ELECTRIC re-
presentative if the error oc-
curs repeatedly.
Fault 7
—
Open output
phase protection
One of the phases (U, V, W) is
not connected.
Check the connections.
—
Shortcut at
24V DC
A shortcut at the 24 V output has
occured (PC terminal).
Remove the shortcut!
PS
Inverter was
stopped via con-
trol panel
STOP key on the control panel
was pressed during external
operating mode.
Check parameter 75.
