Mitsubishi Electric FR-A800, Instruction Manual

Page: 481 / 1042

Parameters (H) Protective function parameter
FR-A800 5 - 301
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's activation level can be set using 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's activation level can be set to using the combination of three
points (Pr. 692, Pr. 693), (Pr. 694, Pr. 695), (Pr. 696, Pr. 51) when the RT signal is ON.
●
When setting Pr. 600, Pr. 602, Pr. 604 (Pr. 692, Pr. 694, Pr. 696) to the same frequency, the following
graph's upper level will be applied.
I002833E
Fig. 5-131: Setting examples
Fig. 5-132:
Overheat protection setting
I002586E
Fig. 5-133:
Overheat protection setting example
I002587E
NOTE Make sure to set the parameters according to the motor temperature characteristic used.
Parameters referred to
Pr. 71 Applied motor => page 5-434
Pr. 72 PWM frequency selection => page 5-219
Pr. 178 to Pr. 189 (input terminal function selection) => page 5-422
Pr. 190 to Pr. 196 (output terminal function selection) => page 5-361
Load ratio
Load ratio
Frequency
Setting
example 1
Setting
example 2
Pr. 9 = 100% of the rated
motor current
Pr. 600 = 6 Hz
Pr. 601 = 50 %
Pr. 602 = 30 Hz
Pr. 603 = 70 %
Pr. 604 = 60 Hz
Pr. 600 = 120 Hz
Pr. 601 = 800 %
Pr. 602 = 3 Hz
Pr. 603 = 50 %
Frequency [
Pr. 604 = 80 Hz
100%
Continuous operation characteristic
Load ratio (ratio to Pr. 9 (Pr. 51)) [%]
Output
frequency
Pr. 603
(Pr. 695)
Pr. 601
(Pr. 693)
Pr. 600
(Pr. 692) Pr. 602
(Pr. 694) Pr. 604
(Pr. 696)
100
80
50
10
Load ratio [%]
Output frequency [Hz]
Pr. 600 = 10 Hz
Pr. 601 = 80 %
Pr. 602 = 10 Hz
Pr. 603 = 50 %
Pr. 604 = 10 Hz