Inverter Output Shutoff Signal (Mrs Signal, Pr. 17) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Function assignment of external terminal and control

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

The inverter output can be shut off from the MRS signal. The logic of the MRS signal can also be selected.
Parameter
Name
Number
17 MRS input selection
Motor coasts
to stop
ON
MRS signal
STF (STR)
ON
signal
(Initial
Setting value "0"
value)
Inverter
Output Output
stop 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. 189 (input terminal
function selection), the MRS signal can be assigned to the other terminal.
⋅ When using an external terminal to input the MRS signal, the MRS signal shuts off the output in any of the operation modes.
CAUTION
⋅ Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Set
parameters after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 178 to Pr. 189 (Input terminal function selection)
234
Initial
Value
0
(1) Output shutoff signal (MRS signal)
⋅ Turning on the output shutoff signal (MRS) during inverter running shuts
off the output immediately.
⋅ Terminal MRS 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.
Time
(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
Setting value "2"
signal is turned ON, the motor coasts to a stop
Inverter
(2) MRS signal logic inversion (Pr. 17 = "2")
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
ON
OFF
ON
Refer to page 231
Setting
Range
0 Normally open input
2 Normally closed input (NC contact input specifications)
External terminal: Normally closed input
4
Communication: Normally open input
0
Operation enabled
Output shutoff
Output shutoff
Output shutoff Operation enabled
Description
(NC contact input specifications)
Pr. 17 Setting
2
Output shutoff Output shutoff
Output shutoff Output shutoff
Output shutoff Operation enabled
Output shutoff
4