5-26
The figure below shows operating characteristics of the electronic thermal overload protection
when F10 = 1. The characteristic factors
D1 through D3 as well as their corresponding
switching frequencies f
2 and f3 vary with the characteristics of the motor. The tables below list
the factors of the motor selected by P99 (Motor 1 Selection).
Cooling Characteristics of Motor with Shaft-driven Cooling Fan
Nominal Applied Motor and Characteristic Factors when P99 (Motor 1 selection) = 0 or 4
Output frequency for
motor characteristic factor
Characteristic
factor (%)
Nominal
applied
motor
(HP)
Thermal time
constant W
(Factory default)
Reference current
for setting the
thermal time
constant (Imax)
f
2 f3 D1 D2 D3
1/8 to 1 75 85 100
2 to 5
7 Hz
85 85 100
7.5 to 15 6 Hz 90 95 100
20 7 Hz 85 85 100
25 to 30
5 min
Allowable
continuous current
u 150%
5 Hz
5 Hz 92 100 100
Nominal Applied Motor and Characteristic Factors when P99 (Motor 1 Selection) = 1 or 3
Output frequency for
motor characteristic factor
Characteristic
factor (%)
Nominal
applied
motor
(HP)
Thermal time
constant W
(Factory default)
Reference current
for setting the
thermal time
constant (Imax)
f
2 f3 D1 D2 D3
1/8 to 30 5 min
Allowable
continuous current
u 150%
Base
frequency
u 33%
Base
frequency
u 33%
69 90 90
Overload detection level (F11)
F11 specifies the level at which the electronic thermal overload protection becomes activated.
In general, set F11 to the rated current of motor when driven at the base frequency (i.e. 1.0 to
1.1 multiple of the rated current of motor 1 (P03)). To disable the electronic thermal overload
protection, set F11 to "0.00: Disable."
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