Mitsubishi Electric FR-F800, Instruction Manual

Page: 338 / 834

(H) Protective function parameter Parameters
5 - 176
The upper limit of stall prevention operation is limited internally to the following:
120% (SLD rating), 150% (LD rating)
Setting the stall prevention operation level (Pr. 22)
●
For Pr. 22 "Stall prevention operation level", set the ratio of the output current to the inverter's
rated current at which the stall prevention operation will be activated. Normally, use this param-
eter in the initial setting.
●
Stall prevention operation stops acceleration (makes deceleration) during acceleration, makes
deceleration during constant speed, and stops deceleration during deceleration.
●
When the stall prevention operation is performed, the Overload warning (OL) signal is output.
154
H631
Voltage reduction
selection during stall
prevention operation
1
0
Output voltage
reduction enabled.
Enable/disable the
output voltage
reduction during stall
prevention operation.
1
Output voltage
reduction disabled.
10
Output voltage
reduction enabled.
Use this setting when
the overvoltage
protective function
(E.OV[ ]) activates
during stall prevention
operation in an
application with large
load inertia.
11
Output voltage
reduction disabled.
157
M430
OL signal output timer 0s
0 to 25 s
Set the OL signal output start time when stall
prevention is activated.
9999 No OL signal output.
858
T040
Terminal 4 function
assignment
0 0, 4, 9999
When set "4", the stall prevention level can be
changed with the signal to the terminal 4.
868
T010
Terminal 1 function
assignment
0 0, 4, 9999
When set "4", the stall prevention level can be
changed with the signal to the terminal 1.
874
H370
OLT level setting 120% 110% 0 to 400%
A trip can be set for when the stall prevention is
activated and the motor stalls. Set the output at
which to activate the trip.
I001120E
Fig. 5-64: Stall prevention operation example
NOTES A continuous overloaded condition may activate a protective function such as motor overload trip
(electronic thermal O/L relay function) (E.THM).
When Pr. 156 has been set to activate the fast response current limit (initial value), the Pr. 22 set-
ting should not be higher than 140%. Such setting will prevent torque generation.
Under PM motor control, the stall prevention operation level is reduced inversely proportional to
the output frequency in the constant output range of the rated motor frequency or higher.
Pr. Name
Initial value
Setting range Description
FM CA
V/F V/F V/F
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux PM PM PM
Pr. 22
Output current
Acce
le
ra
tio
n
D
ece
ler
at
ion
Constant speed
Output frequency
OL
Time