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33
Protective Function
Protective functions
Your inverter is equipped with the following protective function that:
①
displays warning message, or
②
avoids trip without displaying warning message.
③
displays warning message and turns off inverter output, or
④
trips the inverter (the trip signal will be removed upon power off)
Type
Display on
5-digit LED
Protective function
Corrective action
①
Electronic
thermal trip
Monitor
(
Flashes
)
Monitor display flashes when the
output current reaches the
electronic thermal trip level and
the timer operates.
Check for overloading and reduce
the load as necessary.
Overcurrent stall
prevention
(Not displayed)
If the output current exceeds [
Current limit operating point] during
acceleration or constant-speed
operation, the output frequency is
reduced for trip prevention.
(The operation level can be
adjusted with [
Current limit
operating point].)
Increase the acceleration time, or
reduce the inertial load.
②
Overvoltage
stall prevention
(Not displayed)
If the converter’s DC voltage
exceeds approx. 775 V during
deceleration, the deceleration time
is prolonged for trip prevention.
(The deceleration time can be
adjusted with [
Deceleration
factor at stall].)
Prolong the deceleration time, or
reduce the inertial load.
Undervoltage
Instantaneous
power failure
protection
When the converter’s DC voltage
falls below approx. 360 V, it is
judged as “instantaneous power
failure”, and the inverter’s output is
turned off.
∗
1
When the converter’s
DC voltage falls below approx.
300 V, the control circuit is reset.
If the voltage is restored by the
time the control circuit is reset, the
operation can be continued.
∗
2
Check the power source, cabling,
wiring, etc.
③
CW rotation
prevention
∗
3
When the CW rotation prevention
function is selected, CW rotation is
prevented when the CW signal is
issued.
Check if the CW command is not
issued.
∗
1 The inverter can continue normal operation with approx. 15 ms power interruption.
∗
2 Enabled when [
Restart prevention upon power recovery] is set to
.
∗
3 This function is enabled only when [
CW rotation prevention] is set to
.
