Mitsubishi Electric FR-A800, Instruction Manual

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(T) Multi-Function Input Terminal Parameters Parameters
5 - 426
5.12.9 Inverter output shutoff signal
The inverter output can be shut off with the MRS signal. The logic of the MRS signal can also be se-
lected.
About output shutoff signal (MRS signal)
●
When the Output stop (MRS) signal is turned ON while operating the inverter, inverter output is
instantaneously shut off.
●
The response time of the MRS signal is within 2 ms.
●
Terminal MRS may be used as described below.
– To use a mechanical brake (e.g. electromagnetic brake) to stop the motor
The inverter output is shut off when the mechanical brake operates.
– To provide interlock to disable operation by the inverter
With the MRS signal ON, the inverter cannot be operated even if the start signal is entered into
the inverter.
– To 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.
MRS signal logic inversion (Pr. 17 = "2")
When Pr.17 = "2", the MRS signal can be changed to normally closed (NC contact) specification. The in-
verter will shut off the output with MRS signal turned ON (opened).
Pr. Name
Initial
value
Setting
range
Description
17
T720
MRS input selection 0
0 Normally open input
2
Normally closed input
(NC contact input specification)
4
External terminal: Normally closed input
(NC contact input specification)
Communication: Normally open input
Fig. 5-209:
Output shutoff signal
I002653E
Fig. 5-210:
Connection of the MRS terminal in source logic
I002772E
Motor coasts
to stop
Time
ON
ON
MRS signal
STF (STR)
signal
MRS
SD (PC)
MRS
SD (PC)
Setting value "0" *
Output
stop
Setting value "2"
Output
stop
* Initial value