MITSUBISHI ELECTRIC FR-S520 - Manual (Page 48)

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1
.8.5 Output shut-off (MRS signal): Setting "6"
Short the output stop terminal MRS-SD during inverter output to cause the inverter to
immediately stop the output. Open terminals MRS-SD to resume operation in about
10ms. Terminal MRS may be used as described below:
(1) To stop the motor by
mechanical brake (e.g.
electromagnetic brake)
Terminals MRS-SD must be shorted
when the mechanical brake is
operated and be opened before motor
restart.
(2) To provide interlock to disable
operation by the inverter
After MRS-SD have been shorted, the
inverter cannot be operated if the start
signal is given to the inverter.
O
u
tp
ut fr
eq
ue
nc
y
Motor coasted
to stop
0.5Hz
Across
STF-SD
(STR)
ON
ON
Pr. 13
"starting
frequency"
Across
MRS -SD
(3) To coast the motor to stop
The motor is decelerated according to the preset deceleration time and is
stopped by operating the DC injection brake at 3Hz or less. By using terminal
MRS, the motor is coasted to a stop.
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.8.6 External thermal relay input: Setting "7"
When the external thermal relay or thermal relay built
in the motor is actuated, the inverter output is shut
off and an alarm signal is given to keep the motor
stopped to protect the motor from overheat. If the
thermal relay contact is reset, the motor is not
restarted unless the reset terminal RES-SD is
shorted for more than 0.1s and then opened or
power-on reset is performed.
The function may therefore be used as an external
emergency stop signal input.
Inverter
U
V
W
OH
SD
Thermal relay
Motor
IM