Mitsubishi FR-A740-00023-EC, Instruction Manual

Page: 156 / 474

146
Adjust the output torque of the motor (current)
(4) Set multiple stall prevention operation levels (Pr. 48, Pr. 49, Pr. 114, Pr. 115 )
⋅
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.
⋅
In Pr. 48 (Pr. 114) , you can set the stall prevention operation level at the
output frequency from 0Hz to that set in Pr. 49 (Pr. 115) .
During acceleration, however, the operation level is as set in
Pr. 22
.
⋅
This function can also be used for stop-on-contact or similar operation by
decreasing the
Pr. 48 (Pr. 114) setting to weaken the deceleration torque
(stopping torque).
⋅
Pr. 114 and Pr. 115 are made valid when the X9 signal is on. For the
terminal used for X9 signal input, set "9" in any of Pr. 178 to Pr. 189 input
terminal function selection to assign the X9 signal function.
REMARKS
⋅
When Pr. 49
≠
"9999" (level changed according to frequency) and Pr. 48 = "0%", the stall prevention operation level is 0% at or
higher than the frequency set in Pr. 49 .
⋅
In the initial setting, the RT signal is assigned to the RT terminal. By setting "3" to any of Pr. 178 to Pr. 189 (input terminal function
selection)
, you can assign the RT signal to the other terminal.
CAUTION
⋅
Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Please
make setting after confirming the function of each terminal.
⋅
The RT(X9) signal acts as the second (third) function selection signal and makes the other second (third) functions valid. (Refer
to page 226)
Stall prevention
operation current
During acceleration
Running frequency
Pr.48
Pr.49
During deceleration/constant speed During deceleration/constant speed During deceleration/constant speed
Pr.114
Pr.115
Pr. 22
used
Output
frequency (Hz)
Output
frequency
Stall
prevention
level
Set
frequency
Time
Pr.49
(Pr.115)
Set frequency exceeds Pr. 49(Pr.115)
Pr. 48
(Pr.114)
used
Pr. 22
used
Output
frequency (Hz)
Output
frequency
Set
frequency
Time
Pr.49
(Pr.115)
Pr. 48
(Pr.114)
used
Set frequency is Pr. 49 (Pr.115) or less
Pr. 49
Setting
Pr. 115
Setting
Operation
0
(initial value)
The second (third) stall prevention operation is not
performed.
0.01Hz to 400Hz
The second (third) stall prevention operation is
performed according to the frequency.
*1
9999
*2
Setting
can not
be
made.
The second (third) stall prevention function is
performed according to the RT signal.
RT signal ON ... Stall level
Pr. 48
RT signal OFF ... Stall level Pr. 22
*1 The smaller setting of the stall prevention operation levels set in Pr. 22 and Pr. 48
has a higher priority.
*2 When Pr. 868 = "4" (Stall prevention operation level analog input), the stall
prevention operation level also switches from the analog input (terminal 1 input)
to the stall prevention operation level of
Pr. 48 when the RT signal turns on.
(The second stall prevention operation level cannot be input in an analog form.)