IMO Jaguar CUB Instruction Manual page 93

This setting is optimal for operations in which the motor speed quickly slows down
to 0 rpm due to the heavy load with a very small moment of inertia if the motor
coasts to a stop because of the instantaneous power failure.
• There is a 0.5-second delay from detection of the undervoltage until
the motor is restarted This delay is due to the time required for the
residual electricity (magnetic flux) in the motor to drop sufficiently.
Therefore, even if the instantaneous power failure period is shorter
than 0.5 second, a delay of at least 0.5 second is required for the
motor to restart.
• When an instantaneous power failure occurs, the power supply volt-
age for external circuitry (such as relay circuits) that controls the in-
verter may also drop to the extent that run commands are disabled.
Therefore, have the system wait 2 seconds before the issue of run
commands. If any run command is issued within 2 seconds, however,
the inverter will restart. If it is after 2 seconds, the inverter will start at
the starting frequency preset by the related function codes. The ex-
ternal circuitry should be configured so that it is able to issue any run
command within 2 seconds, or so that it features a mechanical latch
relay mechanism that ensures the safety of the system in the event of
an instantaneous power failure.
• If a coast-to-stop command (BX) is issued during the time from the
detection of an instantaneous power failure to repowering, the inverter
exits from the state of waiting for restarting, and enters Running mode.
If any run command is issued, the inverter will start at the starting
frequency preset.
If you select restart after instantaneous power failure (F14 = 4 or 5), the inverter will
automatically restart running the motor when the power is recovered.
The machine should be so designed that human body and peripheral equipment
safety is ensured even after automatic restarting.
Otherwise an accident could occur.
F15, F16
Frequency Limiter (Upper and Lower)
Frequency limiter F15 limits the upper limiter of output frequency. Frequency limiter
F16 maintains the output frequency at the lower limiter even if the set frequency is
lower than the lower limiter. Refer to the figure below.
5-21