102
Function assignment of external terminal and control
4.10.2 Drive unit output shutoff signal (MRS signal, Pr. 17)
(3) Assign a different action for each MRS signal input from communication and external terminal
(Pr. 17 = "4")
When Pr. 17 is set to "4", the MRS signal from external terminal (output stop) can be changed to the normally closed (NC
contact) input, and the MRS signal from communication can be changed to the normally open (NO contact) input.
This function is useful to perform operation by communication with MRS signal from external terminal remained ON.
The drive unit output can be shut off by the MRS signal. Also, logic for the MRS signal can be selected.
Parameter
Number
Name Initial Value Setting Range Description
17 MRS input selection
0
0 Normally open input
2
Normally closed input
(NC contact input specifications)
4
External terminal: Normally closed input
(NC contact input specifications)
Communication: Normally open input
The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 144)
(1) Output shutoff signal (MRS signal)
Turning ON the output shutoff signal (MRS) during drive unit running
shuts off the output immediately.
Set "24" in any of Pr. 178 to Pr. 182 (input terminal function selection) to
assign a function to the MRS signal.
MRS signal may be used as described below.
(a) When mechanical brake (e.g. electromagnetic brake) is used to stop
motor
The drive unit output is shut off when the mechanical brake
operates.
(b) To provide interlock to disable operation by the drive unit
With the MRS signal ON, the drive unit cannot be operated if the
start signal is entered into the drive unit.
(c) Coast the motor to a stop.
When the start signal is turned OFF, the drive unit decelerates the
motor to a stop in the preset deceleration time, but when the MRS
signal is turned ON, the motor coasts to a stop.
(2) MRS signal logic inversion (Pr. 17)
When Pr. 17 is set to "2", the MRS signal (output stop) can be changed
to the normally closed (NC contact) input specification. When the MRS
signal turns ON (opens), the drive unit shuts off the output.
External MRS Communication MRS
Pr. 17 Setting
0 2 4
OFF OFF Operation enabled Output shutoff Output shutoff
OFF ON Output shutoff Output shutoff Output shutoff
ON OFF Output shutoff Output shutoff Operation enabled
ON ON Output shutoff Operation enabled Output shutoff
REMARKS
When using an external terminal to input the MRS signal, the MRS signal shuts off the output in any of the operation modes.
NOTE
Changing the terminal assignment using Pr. 178 to Pr. 182 (input terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
MRS signal
Time
STF (STR)
signal
The motor coasts to stop
ON
ON
Setting value "0" Setting value "2"
(initial value)
Output stop
MRS
SD
Drive unit
Output stop
MRS
SD
Drive unit
