Stall Prevention Operation; Input Compensation Of Multi-Speed And Remote Setting - Mitsubishi Electric FR-F700 Manual

Pr.
22, 23, 48, 49, 66, 148, 149, 154, 156, 157

Stall prevention operation

Pr.22 Stall prevention operation level
Pr.23 Stall prevention operation level compensation factor at double speed
Pr.48 Second stall prevention operation current
Pr.66 Stall prevention operation reduction starting frequency
Pr.148 Stall prevention level at 0V input. Pr.149 Stall prevention level at 10V input.
Pr.154 Voltage reduction selection during stall prevention operation
Pr.156 Stall prevention operation selection
This function monitors the output current and automatically changes
the output frequency to prevent the inverter from coming to an alarm
stop due to overcurrent, overvoltage, etc. It can also limit stall
prevention and fast-response current limit operation during
acceleration/deceleration, driving or regeneration.
Stall prevention
If the output current exceeds the limit value, the output frequency
of the inverter is automatically varied to reduce the output current.
Also the second stall prevention function can restrict the output
frequency range in which the stall prevention function is valid.
(Pr.49)
Fast-response current limit
If the current exceeds the limit value, the output of the inverter is
shut off to prevent an overcurrent.
Set in Pr. 22 the ratio of the output current to the rated inverter
current at which stall prevention operation will be performed.
Normally set this parameter to120% (initial value).
When "9999" is set in Pr. 22, stall prevention operation level can be
changed by the signal to the auxiliary input terminal (terminal 1). For
the adjustment of bias/gain of analog signal, use Pr. 148 and Pr. 149.
During high-speed operation above the rated motor frequency,
acceleration may not be made because the motor current does
not increase. If operation is performed in a high frequency range,
the current at motor lockup becomes smaller than the rated output
current of the inverter, and the protective function (OL) is not
executed if the motor is at a stop.
To improve the operating characteristics of the motor in this case,
the stall prevention level can be reduced in the high frequency
region. This function is effective for performing operation up to the
high speed region on a centrifugal separator etc. Normally, set
60Hz in Pr. 66 and 100% in Pr. 23.
By setting "9999" (initial value) in Pr. 23 Stall prevention operation
level compensation factor at double speed, the stall prevention
operation level is constant at the Pr. 22 setting up to 400Hz.
Pr.22
When Pr.23=9999
Pr.66
Setting "9999" in Pr. 49 Second stall prevention operation frequency
and turning the RT signal on make Pr. 48 Second stall prevention
operation current valid.
The stall prevention operation level from 0Hz to the output
frequency set in Pr. 49 can be set in Pr. 48.
Set frequency exceeds Pr. 49
Output
frequency (Hz)
Output
frequency
Set
frequency
Pr.49
Stall Time
prevention
level Pr. 22
used
Pr. 48
used
indicates simple mode parameters and
Pr.
Pr.49 Second stall prevention operation frequency
Pr.157 OL signal output timer
Pr.23
400Hz
Output frequency (Hz)
Set frequency is Pr. 49 or less
Output
frequency (Hz)
Output
frequency
Pr.49
Set
frequency
Time
Pr. 22 Pr. 48
used
used
indicates extended parameters. When setting parameters, refer to the instruction manual (applied) and understand instructions.
Pr.
Pr. 49 Setting
0 (initial value) Second stall prevention function is not activated
If the output frequency is less than the frequency set in
0.01Hz to 400Hz Pr. 49, the second stall prevention operation function is
activated. (during constant speed or deceleration)
The second stall prevention function is performed according to
the RT signal.
9999
RT signal on ....... Stall level Pr. 48
RT signal off ....... Stall level Pr. 22
Stall prevention operation and fast response current restriction function
can be restricted according to the operation condition using Pr. 156.
Pr. Refer to the section about Pr.4 to Pr.6
24 to 27
Input compensation of multi-
Pr.
28
speed and remote setting
Pr.28 Multi-speed input compensation selection
By inputting the frequency setting compensation signal (terminal 1,
2), the speed (frequency) can be compensated for relative to the
multi-speed setting or the speed setting by remote setting function.
Pr. 28 Setting
0 (initial value) Without compensation
1 With compensation
Acceleration/ deceleration pattern
Pr.
29, 140 to 143
and back lash measures
Pr.29 Acceleration/deceleration pattern selection
Pr.141 Backlash acceleration stopping time
Pr.143 Backlash deceleration stopping time
You can set the acceleration/deceleration pattern suitable for
application.
You can also set the backlash measures that stop acceleration/
deceleration once at the parameter-set frequency and time
during acceleration/deceleration.
Linear acceleration/deceleration
(setting "0", initial value)
Setting value "0"
⋅ When the frequency is changed for
[Linear acceleration
/ deceleration] acceleration, deceleration, etc. in
inverter operation, the output
frequency is changed linearly (linear
acceleration/deceleration) to reach
the set frequency without straining
Time
the motor and inverter.
S-pattern acceleration/deceleration A
(setting "1")
Setting value "1"
⋅ For machine tool spindle
[S-pattern acceleration
/deceleration A]
applications, etc.
Use when acceleration/deceleration
fb
must be made in a short time to a
high-speed region of not lower than
Time
base frequency.
S-pattern acceleration/deceleration B
(setting "2")
Setting value "2"
[S-pattern acceleration
⋅ For prevention of load shifting in
/deceleration B]
conveyor and other applications
Since acceleration/deceleration is
always made in an S shape from
current frequency (f2) to target
f1
frequency (f1), this function eases
shock produced at acceleration/
f2
deceleration and is effective for load
collapse prevention, etc.
Time
Backlash measures (setting "3", Pr.140
Setting value "3"
to Pr.143 )
[Anti-backlash measure
⋅ To avoid backlash, acceleration/
function]
deceleration is temporarily stopped.
f2
Pr.142
Set the acceleration/deceleration
f1
stopping frequency and time in Pr.
Pr.140
140 to Pr. 143.
Time
t1 t2
Pr.143
Pr.141
Operation
Definition
Pr.140 Backlash acceleration stopping frequency
Pr.142 Backlash deceleration stopping frequency
30