IMO Jaguar CUB, Instruction Manual

Page: 74 / 170

5-19
F10 to F12
Electronic Thermal Overload
(Motor property selection, Overload detection level, and Thermal time constant)
F10 through F12 set the thermal characteristics of the motor including the thermal
time constant to simulate an overload status of the motor using the built-in elec-
tronic thermal processing function of the inverter. This function simulates the motor
temperature based on the inverter's internally measured output current. F11 is used
to determine the overload detection level.
Thermal characteristics of the motor specified by these function codes are
also used for the overload early warning. Therefore, even if you need only
the overload early warning, set these characteristics data to function
codes F10 and F12.
F10 selects the cooling characteristics of the motor--built-in cooling fan or externally
powered forced-ventilation fan.
Set F10 to: If the motor is cooled by:
1 Built-in cooling fan for standard purpose motors (self-cooled)
(The cooling performance will decrease with low frequency opera-
tions.)
2 Forced-ventilation fan powered by an inverter duty rated motor.
(The cooling performance will be kept constant regardless of the output
frequency.)
F11 sets the operation level of the electronic thermal function to the current value.
Set approximately 1.0 to 1.1 multiples of the allowable continuous current (rated
current of the motor) at the rated drive frequency (base frequency) of the motor
under normal running conditions. To disable the electronic thermal function, set 0.00
to F11.
F12 sets the thermal time constant of the motor. The inverter interprets the time
constant as an operation period of the electronic thermal function. During the
specified operation period, the inverter will activate the electronic thermal function if
150% current of the operation level specified by F11 flows continuously. The time
constant of general-purpose motors and other induction motors is set to 5 minutes
by factory default.
Data entry range: 0.5 to 75.0 (minutes, in 0.1-minute increment)
F14
Restart Mode after Instantaneous Power Failure
Selects the action of the inverter to be followed when an instantaneous power fail-
ure occurs.
If the inverter detects that the DC link circuit voltage has dropped to less than the
specified undervoltage limit during operation, it interprets the state as an occur-
rence of an instantaneous power failure. However, if the inverter runs with a light
load and the period of the power failure is too short, then it may not detect the power
failure and continue to run.