Inverter Output Shutoff Signal (Mrs Signal, Pr. 17) - Mitsubishi Electric FR-A700 Instruction Manual

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" Setting value "2"
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.
MRS operation from PLC function is changed to NO contact as same as the communication.
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.
⋅ The MRS signal can shut off the output, independently of the PU, external or network operation mode.
CAUTION
⋅ Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Please
make setting after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 178 to Pr. 189 (Input terminal function selection)
Initial Setting
Value Range
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 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
Operation enabled
ON Output shutoff
OFF
Output shutoff
ON
Output shutoff
Refer to page 228
Function assignment of external terminal and control
0 Normally open input
2 Normally closed input (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
Operation enabled
Output shutoff
4
231