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Chapter 4
*1
If the inverter trips because of overvoltage or overcurrent while decelerating the motor, the inverter will display
error code "E16" (instantaneous power failure), and the motor will start free-running. If this error occurs, prolong
the deceleration time.
*2
If a DC voltage (P-N) is supplied to control power supply terminals R0 and T0, the inverter may detect
undervoltage and trip when the inverter power is turned off. If this cause a problem in your system, specify "00"
or "02" for the trip selection.
*3
The inverter may start the motor with 0 Hz if:
1)
the output frequency is not more than half the base frequency or
2)
the voltage induced on the motor is attenuated quickly.
*4
Even when a retry operation (01 to 03)is specified for the selection of restart mode (b001) and "disabling
tripping" (00 or 02) is specified for the selection of a trip after instantaneous power failure or undervoltage in the
stopped state, the inverter will trip if the instantaneous power failure continues over the allowable under-voltage
power failure time. (See Example 2.)
*5
Even when a retry operation is specified for the trip selection, the inverter will trip if the cause of trip is not
removed by the end of the retry wait time before motor restart (b003). If this occurs, prolong the retry wait time.
*6
Even when a retry operation is specified for the retry selection, the inverter will trip if the undervoltage status
continues for 40 seconds or more.
*7
when starting the motor with matching frequency is selected, inverter may restart suddenly by alarm resetting,
resetting and retry-start.
The figures below show the timing charts for starting with a matching frequency (when "02" is specified for the
selection of restart mode [b001]).
t0: Duration of instantaneous power failure
t1: Allowable under-voltage power failure time (b002)
t2: Retry wait time before motor restart (b003)
(Example 1)
Power supply
Inverter output
Motor speed
(Example 3) When the motor frequency (speed) is
more than the setting of "b007":
Power supply
Inverter output
Motor frequency
(speed)
0
Free-running
t0
t2
t1
Free-running
b007
Starting with
matching
frequency
t0
t2
Explanation of Functions
(Example 2)
Power supply
Inverter output
Motor speed
(Example 4) When the motor frequency (speed) is
less than the setting of "b007":
Power supply
Inverter output
Motor frequency
(speed)
0
4-34
Free-running
t0
t1
Free-running
b007
t2
t0
Starting with 0
Hz
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