Inverter Output Shutoff Signal (Mrs Signal, Pr. 17) - Mitsubishi Electric FR-E720-600 Instruction Manual

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
Name
Number
17 MRS input selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 180)
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 Communication MRS
OFF
OFF
ON
ON
REMARKS
The MRS signal is assigned to the terminal MRS in the initial setting. By setting "24" in any of Pr.178 to Pr.184 (input terminal
function selection), you can assign the RT signal to the other terminal.
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. 184 (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. 184 (input terminal function selection)
Function assignment of external terminal and control
Initial Value
0
(1) Output shutoff signal (MRS signal)
Turning on the output shutoff signal (MRS) during inverter running shuts
off the output immediately.
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
Time
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
Setting value "2"
turned on, the motor coasts to a stop.
Inverter
(2) MRS signal logic inversion (Pr. 17)
MRS
When Pr. 17 is set to "2", the MRS signal (output stop) can be changed
SD
to the normally closed (NC contact) input specification. When the MRS
signal turns on (opens), the inverter shuts off the output.
OFF Operation enabled
ON Output shutoff
OFF Output shutoff
ON Output shutoff
Refer to page 131
Setting Range
0 Normally open input
Normally closed input
2
(NC contact input specifications)
External terminal: Normally closed input
4 (NC contact input specifications)
Communication: Normally open input
Pr. 17 Setting
0 2
Output shutoff
Output shutoff
Output shutoff
Operation enabled
Description
4
Output shutoff
Output shutoff
4
Operation enabled
Output shutoff
133