# Stall Prevention Operation - Mitsubishi Electric FR-CS84-012 Instruction Manual

Freqrol-cs80.

 Frequency jump (Pr.31 to Pr.36)
• Up to three areas may be set, with the jump frequencies set to either the top or bottom point of each area.
• The settings of frequency jumps 1A, 2A, and 3A are the jump points, and operation is performed at these frequencies in
the jump areas.
Set frequency after
frequency jump
Frequency jump
Pr.36
Pr.35
Pr.33
Pr.34
Pr.32
Pr.31
Input set frequency (Hz)
Example 1) To fix the frequency to 30 Hz in the range of 30 Hz to 35 Hz, set 35 Hz in
Pr.34:35Hz
Pr.33:30Hz
Example 2) To change the frequency to 35 Hz in the range of 30 Hz to 35 Hz, set 35 Hz in
Pr.33:35Hz
Pr.34:30Hz
Parameters referred to
Pr.1 Maximum frequency, Pr.2 Minimum frequency, Pr.18 High speed maximum frequency
5.6.9

## Stall prevention operation

This function monitors the output current and automatically changes the output frequency to prevent the inverter from shutting
off due to overcurrent, overvoltage, etc. It can also limit the stall prevention and fast-response current limit operation during
acceleration/deceleration and power/regenerative driving.
• Stall prevention: If the output current exceeds the stall prevention operation level, the output frequency of the inverter is
automatically changed to reduce the output current.
• Fast-response current limit: If the current exceeds the limit value, the output of the inverter is shut off to prevent an
overcurrent.
Pr.
Name
22
Stall prevention
H500
operation level
156
Stall prevention
H501
operation selection
Stall prevention
23
operation level
H610
compensation factor at
double speed
Stall prevention
66
operation reduction
H611
starting frequency
157
OL signal output timer
M430
Initial value
Setting range
0
150%
0.1 to 200%
0
0 to 31, 100, 101
0 to 200%
9999
9999
50 Hz
0 to 400 Hz
0 to 25 s
0 s
9999
and 30 Hz in
Pr.34
Pr.33
page 117
Description
Stall prevention operation disabled.
Set the current limit at which the stall prevention operation
starts.
Enable/disable the stall prevention operation and the fast-
response current limit operation.
The stall operation level can be reduced for operation at the
rated frequency or higher.
Stall prevention operation disabled at double speed.
Set the frequency at which the stall operation level reduction
starts.
Set the OL signal output start time when stall prevention is
activated.
No OL signal output.
5.6 (H) Protective function parameter
.
Pr.33
and 30 Hz in
.
Pr.34
5. PARAMETERS
2
2
3
4
5
6
7
8
9
10
119