Mitsubishi Electric FR-E500 Instruction Manual page 185

(3) Warnings
Operation Panel Indication
Name
Description
Check point
Corrective action
Note: 4 The stall prevention operation current can be set as desired. It is factory-set to
150%.
Operation Panel Indication
Name
Description
Check point
Corrective action
OL
Stall prevention (overcurrent)
During If a current of more than 150% (Note 4) of
acceleration the rated inverter current flows in the
motor, this function stops the increase in
frequency
reduces to prevent the inverter from
resulting in overcurrent shut-off. When the
overload current has reduced below 150%,
this function increases the frequency
again.
During If a current of more than 150% (Note 4) of
constant-speed the rated inverter current flows in the
operation motor, this function lowers the frequency
until the overload current reduces to
prevent overcurrent shut-off. When the
overload current has reduced below 150%,
this function increases the frequency up to
the set value.
During If a current of more than 150% (Note 4) of
deceleration the rated inverter current flows in the
motor, this function stops the decrease in
frequency
reduces to prevent the inverter from
resulting in overcurrent shut-off. When the
overload current has reduced below 150%,
this function decreases the frequency
again.
Check the motor for use under overload.
The acceleration/deceleration time may change.
Increase the stall prevention operation level with Pr. 22 "stall
prevention operation level", or disable stall prevention with
Pr. 156 "stall prevention operation selection".
oL
Stall prevention (overvoltage)
During If the regenerative energy of the motor
deceleration increases too much to exceed the brake
capability, this function stops the decrease
in frequency to prevent overvoltage shut-
off. As soon as the regenerative energy
has reduced, deceleration resumes.
Check for sudden speed reduction.
The deceleration time may change. Increase the deceleration
time using Pr. 8 "deceleration time"
169
PROTECTIVE FUNCTIONS
FR-PU04 OL (Stll Prev STP)
until the overload
until the overload
FR-PU04 oL
current
current