V/F Pattern Matching Applications; Logic Selection Of Output Stop Signal (Mrs); Jog Operation; Stall Prevention Operation - Mitsubishi Electric FR-A700 Manual

Pr.
Pr.
14

V/F pattern matching applications

Pr.14 Load pattern selection
You can select the optimum
characteristic) for the application and load characteristics.
This function is valid for V/F control only.
Setting "0" (initial value)
setting "4, 5", RT signal is on
For rated torque load
100%
Pr.3 Base frequency
Output frequency (Hz)
Setting "2"
setting "4", RT signal is off
For elevator loads
At forward rotation boost...Pr.0 setting
At reverse rotation boost...0%
100%
Forward
rotation
Reverse
Pr.0
rotation
Base frequency
Output frequency (Hz)
Pr.
Pr.
15, 16

Jog operation

Pr.15 Jog frequency
You can set the frequency and acceleration/deceleration time for
jog operation. Jog operation can be performed from either the
outside or PU.
Can be used for conveyor positioning, test operation, etc.
Output
frequency(Hz)
Pr.20
Pr.15
Forward
Jog frequency
rotation
setting range
Pr.16
JOG signal
Forward
rotation STF
ON
Reverse
rotation STR
When setting parameters, refer to the instruction manual (applied) and understand instructions.
V/F V/F V/F
output characteristic (V/F
Setting "1"
For variable-torque load
100%
Pr.3 Base frequency
Output frequency (Hz)
Setting "3"
setting "5", RT signal is off
For elevator loads
At forward rotation boost...0%
At reverse rotation boost...Pr.0 setting
100%
Reverse
rotation
Forward
Pr.0
rotation
Base frequency
Output frequency (Hz)
Pr.16 Jog acceleration/deceleration time
Time
Reverse
rotation
ON
ON
Pr.
Pr.
17

Logic selection of output stop signal (MRS)

Pr.17 MRS input selection
The inverter output can be shut off by the MRS signal. Also, logic
for the MRS signal can be selected.
Motor coasts
to stop
Time
ON
MRS signal
STF (STR)
ON
signal
Pr. Pr.
18
Refer to the section about Pr. 1.
Pr.
Pr.
19
Refer to the section about Pr. 3.
Pr.
Pr.
20, 21
Refer to the section about Pr. 7.
Pr.
Pr.
22, 23, 48, 49, 66, 114, 115, 148, 149, 154, 156, 157, 858, 868

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.114 Third stall prevention operation current
Pr.148 Stall prevention level at 0V input
Pr.154 Voltage reduction selection during stall prevention operation
Pr.156 Stall prevention operation selection
Pr.858 Terminal 4 function assignment
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.
Invalid for vector control.
Stall prevention
If the output current exceeds the stall prevention operation level, the
output frequency of the inverter is automatically varied to reduce the
output current. Also the second and third stall prevention function
can restrict the output frequency range in which the stall prevention
function is valid.
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 percentage of the output current to the rated inverter
current at which stall prevention operation will be performed.
Normally set this parameter to 150% (initial value).
For the 3.7kW or less, the Pr.22 setting changes from 150% (initial
value) to 200% when operation is changed from V/F control or
advanced magnetic flux vector control to real sensorless vector
control or vector control.
To set stall prevention operation level using an analog signal from
terminal 1 (terminal 4) , set "4" in Pr.868 (Pr. 858). 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 executed
even 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
range. This function is effective for performing operation up to the
high-speed range on a centrifugal separator etc. Normally, set 60Hz
in Pr.66 and 100% in Pr.23.
(Initial
Setting value "0" Setting value "2"
value)
Inverter Inverter
Output Output
stop stop
MRS MRS
SD (PC) SD (PC)
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Pr.49 Second stall prevention operation frequency
Pr.115 Thrid stall prevention operation frequency
Pr.149 Stall prevention level at 10V input
Pr.157 OL signal output timer
Pr.868 Terminal 1 function assignment
44