Mitsubishi Electric FR-F800 Series Instruction Manual page 273

NOTE
• When using terminal 2 for PTC thermistor input (Pr.561 ≠ "9999"), the terminal 2 does not operate as an analog frequency
command terminal. The PID and dancer control functions assigned to the terminal 2 is also disabled. Use Pr.133 PID action
set point to set the set point for the PID function.
• To input power to the PTC thermistor power supply, always use the terminal 10 and do not use any other terminals or an
external power supply. Otherwise, the PTC thermistor protection (E.PTC) does not operate properly.
• When E.PTC is activated, the alarm display, "External protection (AU terminal)", may appear on the parameter unit (FRPU07),
but it is not a fault.
 Overheat protection to match the characteristic of the motor (Pr.600 to
Pr.604, Pr.692 to Pr.696)
• The activation level of the electronic thermal O/L relay can be varied to match the motor temperature characteristic.
• The electronic thermal O/L relay operation level can be set with the combination of three points (Pr.600, Pr.601), (Pr.602,
Pr.603), (Pr.604, Pr.9). Two or more points are required for setting.
• The electronic thermal O/L relay operation level can be set with the combination of three points (Pr.692, Pr.693), (Pr.694,
Pr.695), (Pr.696, Pr.51) when the RT signal is ON.
Continuous operation characteristic
Load ratio (ratio to Pr.9 (Pr.51)) [%]
100%
Pr.603
(Pr.695)
Pr.601
(Pr.693)
Pr.600
(Pr.692)
Setting
example 1
Pr.9=100% of the rated
motor current
Pr.600=6Hz
Pr.601=50%
Pr.602=30Hz
Pr.603=70%
Pr.604=60Hz
• When setting Pr.600, Pr.602, and Pr.604 (Pr.692, Pr.694, and Pr.696) to the same frequency, the graph shows a step
plot.
Load ratio [%]
100
80
50
10
NOTE
• Make sure to set the parameters according to the temperature characteristic of the motor used.
Parameters referred to
Pr.71 Applied motorpage 379
Pr.72 PWM frequency
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
272
5. PARAMETERS
5.7 (H) Protective function parameter
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Pr.602 Pr.604 Output frequency
(Pr.694) (Pr.696)
Load ratio
100%
70%
50%
6Hz 30Hz 60Hz
Pr.600 = 10Hz
Pr.601 = 80%
Pr.602 = 10Hz
Pr.603 = 50%
Pr.604 = 10Hz
Output frequency[Hz]
selectionpage 218
selection)page 373
selection)page 330
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Load ratio
Setting
example 2
100%
Pr.600=120Hz
Pr.601=60%
60%
Pr.602=3Hz
50%
Pr.603=50%
Pr.604=60Hz
Frequency
3Hz 60Hz 120Hz
Frequency