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Function
Ixternai thermal relay
signal input ('2)
Brake transistor fault
detection
('3)
Stall prevention
Memory Error
Descrlptlon
~~
~~
When an external thermal relay for motor overheat protection or thermal relay
embedded in motor is activated (contact open), inverter output will be shut
off. Even if the relay contact point is restored, the inverter wili not be restarted
unless it
IS
reset.
~
~~
~
If trouble occurs with brake transistor, for example, amount of regenerative
energy from the motor is excessively large when connecting the optional
brake resistor, this function detects It and shuts off inverter output.
When 150% ('4) or more of the inverter rated current flows to the motor
during acceleration (or constant speed operation), this function stops
increasing frequency
(or
reduces frequency) until the
load
current decreases,
to prevent the inverter from overcurrent tripping. When the load current has
decreased below 15G%, this function allows the inverter to return tc and
continue the previous operation. During deceleration, in contrast, if braking
duty exceeds the rated value, this function stops reducing frequency to
prevent the regenerative overvoltage shut off from being activated. When the
regenerative energy
Is
lower, this function continues deceleration again.
Memory in the inverter is corrupted.
lndlcatlon
(Parameter unit)
I
I
indicator lamp
flickers.
-
125
-
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