120
5. Speed Control
5.4 Setting the torque limit level
• When a high load is applied and the torque limit is activated under speed control, the motor stalls. At this time, if the rotation
speed is lower than the value set in
Pr.865 Low speed detection
and the output torque exceeds the level set in
Pr.874
OLT level setting
, and this state continues for 3 seconds, Stall prevention stop (E.OLT) is activated and the inverter output
is shut off.
NOTE
• Under V/F control or Advanced magnetic flux vector control, if the output frequency drops to 0.5 Hz due to the stall prevention
operation and this state continues for 3 seconds, a fault indication (E.OLT) appears, and the inverter output is shut off. This
operation is activated regardless of the
Pr.874
setting.
• This fault does not occur under torque control.
Adjusting the signal output under torque limit operation and output
timing (OL signal, Pr.157)
• If the output torque exceeds the torque limit level and the torque limit is activated, the overload warning (OL signal) is turned
ON for 100 ms or longer. When the output torque drops to the torque limit level or lower, the output signal also turns OFF.
•
Pr.157 OL signal output timer
can be used to set whether to output the OL signal immediately, or whether to output it
after a certain time period has elapsed.
• For the OL signal, set "3" (positive logic) or "103" (negative logic) in one of
Pr.190 to Pr.196 (Output terminal function
selection)
to assign the function to the output terminal.
• The OL signal is also output during the regeneration avoidance operation ("OLV" display (overvoltage stall)).
NOTE
• Changing the terminal assignment using
Pr.190 to Pr.196 (Output terminal function selection)
may affect the other
functions. Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.22 Stall prevention operation level
Pr.178 to Pr.189 (Input terminal function selection)
Pr.190 to Pr.196 (Output terminal function selection)
Pr.865 Low speed detection
Pr.157 setting value
Description
0 (initial value)
Output immediately.
0.1 to 25
Output after the set time (s).
9999
Not output.
Output torque
Output
frequency
Start signal
(STF)
Fault signal
(ALM)
Pr.874
Torque limit
Pr.865
3s
Torque
Time
Time
E.OLT occurrence
Overload state
(OL operation)
OL output signal
Pr.157
Set time(s)
Summary of Contents for FR-E800
Page 17: ...16 1 Introduction 1 3 Related manuals MEMO ...
Page 51: ...50 2 Basic Operation 2 8 I O terminal function assignment MEMO ...
Page 89: ...88 3 Parameters 3 4 Parameter list by function group number MEMO ...
Page 135: ...134 5 Speed Control 5 9 Troubleshooting in the speed control MEMO ...
Page 153: ...152 6 Torque Control 6 7 Troubleshooting in torque control MEMO ...
Page 195: ...194 8 E Environment Setting Parameters 8 18 Current average value monitor signal MEMO ...
Page 237: ...236 10 D Operation Command and Frequency Command 10 6 Operation by multi speed setting MEMO ...
Page 339: ...338 13 T Multi Function Input Terminal Parameters 13 9 Start signal operation selection MEMO ...
Page 455: ...454 16 G Control Parameters 16 13 Speed smoothing control MEMO ...
