Inverter Output Shutoff Signal (Mrs Signal, Pr. 17) - Mitsubishi Electric FR-F700PJ Instruction Manual

Function assignment of external terminal and control

4.11.2 Inverter output shutoff signal (MRS signal, Pr. 17)

The inverter output can be shut off by the MRS signal. Also, logic for the MRS signal can be selected.
Parameter
Number
17 MRS input selection
The above parameter can be set when Pr. 160 Extended function display selection = "0". (Refer to page 197)
The motor coasts to stop
ON
MRS signal
STF (STR)
ON
signal
Setting value "0"
(initial value)
Inverter
Output stop Output stop
MRS
SD
(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.
External MRS
OFF
OFF
ON
ON
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.
An IPM motor is a motor with interior permanent magnets. High voltage is generated at motor terminals while
the motor is running. Do not touch motor terminals and other parts until the motor stops to prevent an electric
shock.
Parameters referred to
Pr. 178 to Pr. 182 (input terminal function selection)
136
Name Initial Value
(1)
Turning ON the output shutoff signal (MRS) during inverter running
MRS signal may be used as described below.
(a) When mechanical brake (e.g. electromagnetic brake) is used to stop
Time
(b) To provide interlock to disable operation by the inverter
(c) Coast the motor to a stop.
Setting value "2"
Inverter
(2)
MRS
 When Pr. 17 is set to "2", the MRS signal (output stop) can be changed
SD
Communication MRS
OFF
ON
OFF
ON
Setting Range
0
2
0
4
Output shutoff signal (MRS signal)
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.
motor
The inverter output is shut off when the mechanical brake operates.
With the MRS signal ON, the inverter cannot be operated if the start
signal is entered into 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.
MRS signal logic inversion (Pr. 17)
to the normally closed (NC contact) input specification. When the MRS
signal turns ON (opens), the inverter shuts off the output.
0
Operation enabled
Output shutoff
Output shutoff
Output shutoff Operation enabled
CAUTION
Refer to page 134
Description
Normally open input
Normally closed input
(NC contact input specifications)
External terminal: Normally closed input
(NC contact input specifications)
Communication: Normally open input
Pr. 17 Setting
2
Output shutoff Output shutoff
Output shutoff Output shutoff
Output shutoff Operation enabled
Output shutoff
4