MITSUBISHI ELECTRIC FR-S520E - Manual (Page 50)

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How to use the input signals (assigned terminals
RL, RM, RH, STR)
1.5.8 Reset signal:
Pr. 60 to Pr. 63 setting
"10"
Used to reset the alarm stop state established when the inverter's protective function
is activated. The reset signal immediately sets the control circuit to the initial (cold)
status, e.g. initializes the electronic thermal relay function protection circuit. It shuts off
the inverter output at the same time. During reset, the inverter output is kept shut off.
To give this reset input, short terminals RES-SD for more than 0.1s. When the shorting
time is long, the operation panel or parameter unit displays the initial screen, which is
not a fault.
After opening terminals RES-SD (about 1s), operation is enabled.
The reset terminal is used to reset the inverter alarm stop state. If the reset terminal is
shorted, then opened while the inverter is running, the motor may be restarted during
coasting (refer to the timing chart below) and the output may be shut off due to
overcurrent or overvoltage.
Setting either "1" or "15" in reset selection Pr. 75 allows the accidental input of the
reset signal during operation to be ignored.
(For details, refer to page 109.)
CAUTION
Frequent resetting will make electronic thermal relay function invalid.
Across RES -
Across
STF (STR)-
ON
ON
Coasting
When motor is restarted
during coasting, inverter
activates current limit to
start acceleration.
Coasting to stop
(Indicates motor speed)
Coasting time
ON
T
Ordinary
acceleration
T: Should be longer than the time of
coasting to stop.
Output frequency (Hz)
SD
SD