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Function assignment of external terminal and control
4
PARAMETERS
4.10.2 Inverter 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 inverter 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 162)
(1) Output shutoff signal (MRS signal)
Turning ON the output shutoff signal (MRS) during inverter 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 inverter output is shut off when the mechanical brake operates.
(b) To provide interlock to disable operation by the inverter
With the MRS signal ON, the inverter cannot be operated if the start
signal is entered into the inverter.
(c) Coast the motor to a stop.
When the start signal is turned OFF, the inverter 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 inverter 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
The MRS signal can shut off the output, independently of the PU, external or network operation mode.
NOTE
Changing the terminal assignment using Pr. 178 to Pr. 182 (input terminal function selection) may affect the other
functions. Make setting after confirming the function of each terminal.
Parameters referred to
Pr. 178 to Pr. 182 (input terminal function selection) Refer to page 113
ON
ON
MRS Signal
Time
STF (STR)
signal
The motor coasts to stop
Setting value "0" Setting value "2"
(initial value)
Output stop
MRS
SD
Inverter
Output stop
MRS
SD
Inverter