Mitsubishi Electric FR-E520 Instruction Manual page 108

Note: 1. When "Operation not continued for OL signal output" is selected using
Pr.156, the "E.OLT" alarm code (stopped by stall prevention) is displayed
and operation stopped.
(Alarm stop display "E.OLT")
2. If the load is heavy, the lift is predetermined, or the acceleration/deceleration
time is short, the stall prevention may be activated and the motor not
stopped in the preset acceleration/deceleration time. Therefore, set
optimum values to the Pr. 156 and Pr. 22 (Pr. 23).
3. When the high-response current limit has been set in Pr. 156 (factory setting
has the current limit activated), do not set the Pr. 22 value to 170% or more.
Torque will not be developed by doing so.
4. In vertical lift applications, make setting so that the high-response current
limit is not activated. Torque may not be produced, causing a gravity drop.
Do not set a small value as the stall prevention operation current.
Otherwise, torque generated will reduce.
Test operation must be performed.
Stall prevention operation during acceleration may increase the
acceleration time.
Stall prevention operation during constant speed may change the speed
suddenly.
Stall prevention operation during deceleration may increase the
deceleration time, increasing the deceleration distance.
# # # # Refer to Pr. 4 to Pr. 6.
Pr. 24 to Pr. 27
CAUTION
98
PARAMETERS