External Fault Input Signal; Selecting The Condition To Activate The Second Function Selection (Rt) Signal Or The Third Function Selection (X9) Signal - Mitsubishi Electric FR-A800 Series Instruction Manual

 MRS signal logic inversion (Pr.17 = "2")
• When "2" is set in Pr.17, the input specification of the MRS signal is changed to normally closed (NC contact). The inverter
will shut off the output when the MRS signal is turned OFF (when the contact is opened).
 Assigning a different action for each MRS signal input via
communication and external terminal (Pr.17 = "4")
• When Pr.17 = "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.
External MRS
OFF
OFF
ON
ON
NOTE
• The MRS signal is assigned to terminal MRS in the initial status. 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.
• 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 using Pr.178 to Pr.189 (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.189 (Input terminal function

5.12.10 External fault input signal

The inverter output can be shut off by inputting the External fault input (X32) signal when an external fault occurs. To assign
the X32 signal, set "32" in any of Pr.178 to Pr.189 (Input terminal function selection).
 Details of the operation
• When the External fault input (X32) signal turns OFF during operation, the inverter activates the protective function with
the indication "E.EF" displayed to shut off the output.
• When the X32 signal turns OFF during a stop, the protective function is not activated ("E.EF" is not displayed).
• When the inverter operation is started with the X32 signal OFF, the inverter activates the protective function immediately
to shut off the output.
NOTE
• When the X32 signal turns OFF during zero speed control or pre-excitation while the start signal is OFF, the inverter output is
shut off.
• When the inverter operation is started with the X32 signal OFF, the inverter may output the AC voltage for an extremely brief
moment.
5.12.11 Selecting the condition to activate the Second
The second function can be selected using the RT signal, and the third function can be selected using the X9 signal.
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Communication MRS
OFF
ON
OFF
ON
selection)page 521
function selection (RT) signal or the Third function
selection (X9) signal
search engine
0
Operation enabled Output shutoff
Output shutoff Output shutoff
Output shutoff Output shutoff
Output shutoff Operation enabled
Pr.17 setting
2
Output shutoff
Output shutoff
Operation enabled
Output shutoff
5. PARAMETERS
5.12 (T) Multi-function input terminal parameters
1
2
3
4
4
5
6
7
8
9
10
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