7.2’ Protective functions
. .
The inverter is provided with the following protective functions for protection
from overcurrent or overvoltage.
If a protective function is
activated, the transistor base current (output)
is shut off and the motor stops after coasting. Its cause is displayed by
the readout of parameter unit (when parameter unit is used) .
For details, refer to the description “PARAMETER UNIT”. (p. 92)
Function Description
Remedy
Overcurrent
When 150% (Note*)
or more of the inverter
Prolong acceleration
stall prevention . rated current flows into the motor during
time or reduce load
acceleration, this function stops increase of to prevent recurrence
frequency (inverter output) until load current of action of this
reduces to prevent - the inverter from
function.
overcurrent tripping.
When 150% or more of the inverter rated
current flows during normal (constant-
speed) operation, this function reduces
frequency until load current reduces to
prevent inverter from overcurrent tripping.
After load current is reduced below 150%,
this function allows increase of frequency
up to the preset frequency.
Regenerative If converter output voltage is increased
Prolong deceleration
overvoltage excessively by regenerative energy during
time.
stall prevention motor deceleration, this function stops
decrease of frequency to prevent inverter
from overvoltage tripping.
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