Selecting The Condition To Activate The Second Function Selection (Rt) Signal - Mitsubishi Electric FR-F820-00046 Instruction Manual

• The response time of the MRS signal is within 2 ms.
• The MRS signal is used in the following cases.
To stop the motor using a mechanical brake (e.g.
electromagnetic brake)
To provide interlock to disable the motor operation by the
inverter
To coast the motor to a stop
 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 ON (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
5.9.10 Selecting the condition to activate the Second
function selection (RT) signal
The second function can be selected using the RT signal. The condition to activate the second function can be also set.
Pr. Name
RT signal function
155
validity condition
T730
selection
• Turning ON the Second function selection (RT) signal enables the second functions.
• The following are the examples of the applications of the second functions.
Switching between regular use and emergency use
Switching between heavy load and light load
Changing the acceleration/deceleration time by break point acceleration/deceleration
Switching characteristics of main motor and sub motor
358
5. PARAMETERS
5.9 (T) Multi-function input terminal parameters
Application
Communication MRS
OFF
ON
OFF
ON
selection)page 355
Initial value
0
The inverter output is shut off when the mechanical brake operates.
With the MRS signal ON, the motor cannot be driven by the inverter even if
the start signal is input to 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.
0
Operation enabled Output shutoff
Output shutoff Output shutoff
Output shutoff Output shutoff
Output shutoff Operation enabled
Setting range
The second function is immediately enabled when the RT signal
0
is turned ON.
The function cannot be changed to the second function during
acceleration/deceleration. When the signal is turned ON during
10
acceleration/deceleration, the function is changed after the
acceleration/deceleration is finished.
Description
Pr.17 setting
2
Output shutoff
Output shutoff
Operation enabled
Output shutoff
Description
4