4.8 Configuring Function Codes for Drive Controls
4-38
4.8.3 Motor temperature protection setting
[ 1 ] Electronic thermal overload relay (for motor 1 protection)
The inverter is equipped with an electronic thermal overload relay protective function which is activates (OL1).
Output current inside the inverter is monitored, and if the motor is run at greater current value than that for which a
long time is set, the protective function (OL1) is triggered. This function is used to protect the motor from
overheating due to excessive motor loads.
Set based on the characteristics of the motor being used.
Function code F10*: Select motor characteristics (1: autocooling fan (factory default), 2: separately excited fan
(inverter motor, etc.)),
F11*: Operation level (set motor rated current x 1.0 to 1.1, factory default is Fuji standard motor
rated current value),
F12*: Thermal time constant (time that motor runs at 150% of operation level)
Refer to Chapter 5 "5.3.1 F codes (Basic functions)" for details. For motors 2 to 4, set with function codes A, b,
and r.
It is not possible to provide protection for individual motors when multiple motors are connected to a
single inverter. Individual protection should therefore be provided using thermal overload relays.
[ 2 ] Motor protection with thermistor
If the motor is equipped with a built-in PTC NTC type thermistor for temperature detection, the motor temperature
is detected directly, offering temperature protection by inputting the signals from these devices to control terminals
[V2] and [11].
Connection method
Fig.4.8-5
When using the terminal [V2] for PTC/NTC thermistor input, also set SW5 on the control printed
circuit board to the PTC/NTC side.
Function code H26*: 0: No operation
1: PTC thermistor (protection stopped with OH4)
2: PTC thermistor (warning output)
3: NTC thermistor (protection stopped with OH4)
H27*: Operation level
Set the operating voltage Vv2 obtained with the following calculation for H27*.
V
V2
=
Rp
27000+Rp
× 10.5 (V) Vv2: Operating voltage, Rp: Thermistor operating resistance
Refer to Chapter 5 “5.3.5 H codes (High performance functions)” for details.
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