Output shutoff signal (MRS signal)
• When the Output stop (MRS) signal is turned ON while operating the inverter, the inverter output is instantaneously shut
• The response time of the MRS signal is within 2 ms.
• The MRS signal is used in the following cases.
To stop the motor using a mechanical brake (e.g.
To provide interlock to disable the motor operation by the
To coast the motor to a stop
MRS signal logic inversion (Pr.17 = "2")
• When "2" is set in
will shut off the output when the MRS signal is turned ON (when the contact is opened).
Assigning a different action for each MRS signal input via
communication and external terminal (Pr.17 = "4")
= "4", the MRS signal input from an external terminal is normally closed (NC contact), and the MRS signal input
from communication is normally open (NO contact). This function is useful to perform operation via communication while
keeping the ON state of the MRS signal input from the external terminal.
• The MRS signal is assigned to terminal MRS in the initial status. Set "24" in any of Pr.178 to Pr.182 (Input terminal function
selection) to assign the MRS signal to another terminal.
• When using an external terminal to input the MRS signal, the MRS signal shuts off the output in any of the operation modes.
• The MRS signal is valid regardless of whether it is input through the external terminal or via network, but when the MRS signal
is used as the Inverter run enable (X10) signal, input the signal through the external terminal.
• When the terminal assignment is changed with Pr.178 to Pr.182 (Input terminal function selection), wiring may be mistaken
due to different terminal name and signal contents, or may affect other functions. Set parameters after confirming the function
of each terminal.
Parameters referred to
Pr.178 to Pr.182 (Input terminal function selection)
5.8 (T) Multi-function input terminal parameters
Setting value "0"
, the input specification of the MRS signal is changed to normally closed (NC contact). The inverter
Setting value "2"
The inverter output is shut off when the mechanical brake operates.
With the MRS signal ON, the motor cannot be driven by the inverter even if
the start signal is input to the inverter.
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.