Mitsubishi Electric 800 Series Instruction Manual page 231

5.7.1 Motor overheat protection (electronic thermal O/L relay)
Set the current of the electronic thermal O/L relay function to protect the motor from overheating. Such settings will provide the
optimum protective characteristic considering the low cooling capability of the motor during low-speed operation.
Pr.
9 Electronic thermal O/L relay
H000
600 First free thermal reduction
H001 frequency 1
601 First free thermal reduction
H002 ratio 1
602 First free thermal reduction
H003 frequency 2
603 First free thermal reduction
H004 ratio 2
604 First free thermal reduction
H005 frequency 3
607 Motor permissible load level
H006
51 Second electronic thermal O/L
H010 relay
692 Second free thermal reduction
H011 frequency 1
693 Second free thermal reduction
H012 ratio 1
694 Second free thermal reduction
H013 frequency 2
695 Second free thermal reduction
H014 ratio 2
696 Second free thermal reduction
H015 frequency 3
608 Second motor permissible load
H016 level
561 PTC thermistor protection level
H020
1016 PTC thermistor protection
H021 detection time
*1 The setting range for FR-F860-00680 or lower. The minimum setting increment is "0.01 A".
*2 The setting range for FR-F860-01080 or higher. The minimum setting increment is "0.1 A".
230
5. PARAMETERS
5.7 (H) Protective function parameter
Name Initial value
Inverter
rated current
9999
100%
9999
100%
9999
150%
9999
9999
100%
9999
100%
9999
9999
9999
0 s
Setting range
*1 Set the rated motor current.
0 to 500 A
*2
0 to 3600 A
0 to 590 Hz The electronic thermal O/L relay operation level can be
changed to match the motor temperature characteristics
9999
with the combination of these three points (Pr.600,
1 to 100%
Pr.601), (Pr.602, Pr.603), (Pr.604, Pr.9).
9999
9999: Free thermal O/L relay invalid
0 to 590 Hz
9999
1 to 100%
9999
0 to 590 Hz
9999
110 to 250% Set the permissible load according to the motor
characteristics.
Enabled when the RT signal is ON.
*1
0 to 500 A
Set the rated motor current.
*2
0 to 3600 A
9999 Second electronic thermal O/L relay invalid
0 to 590 Hz The electronic thermal O/L relay operation level can be
changed to match the second motor temperature
9999
characteristics with the combination of these three points
1 to 100%
(Pr.692, Pr.693), (Pr.694, Pr.695), (Pr.696, Pr.51).
9999
9999: Second free thermal O/L relay invalid
0 to 590 Hz
9999
1 to 100%
9999
0 to 590 Hz
9999
110 to 250% Set the permissible load when the RT signal is ON.
9999 The Pr.607 setting is applied even when the RT signal is
ON.
0.5 to 30 kΩ Set the PTC thermistor protection level (resistance).
9999 PTC thermistor protection disabled
0 to 60 s Set the time from when the resistance of the PTC
thermistor reaches the protection level until the protective
function is activated.
Description