Mitsubishi Electric FR-F800 Series Instruction Manual page 268

Pr.
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 9999
H020
1016 PTC thermistor protection
H021 detection time
*1 The setting range for the FR-F820-02330(55K) or lower and FR-F840-01160(55K) or lower. The minimum setting increment is 0.01 A.
*2 The setting range for the FR-F820-03160(75K) or higher and FR-F840-01800(75K) or higher. The minimum setting increment is 0.1 A.
 Electronic thermal O/L relay operation characteristic for induction motor
(Pr.9)
• This function detects the overload (overheat) of the motor and shut off the inverter output by stopping the operation of the
transistor at the inverter output side.
• Set the rated current (A) of the motor in Pr.9 Electronic thermal O/L relay. (If the motor has both 50 Hz and 60 Hz ratings
and the Pr.3 Base frequency is set to 60 Hz, set to 1.1 times the 60 Hz rated motor current.)
• Set "0" in Pr.9 to avoid activating the electronic thermal relay function; for example, when using an external thermal relay
for the motor.
(Note that the output transistor protection of the inverter is activated. (E.THT))
• When using the Mitsubishi Electric constant-torque motor, set Pr.71 Applied motor = "1, 13 to 16, 50, 53, or 54". (This
setting enables the 100% constant-torque characteristic in the low-speed range.)
Pr.9 = 50% setting
of inverter rating
70
60
50
240
180
120
60
*1 When setting Pr.9 to a value (current value) of 50% of the inverter rated current
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Name
150%
9999
9999
100%
9999
100%
9999
9999
0 s
Pr.9 = 100% setting
∗1, 2 of inverter rating
30Hz or more
30Hz
20Hz
or more ∗3
10Hz
20Hz
10Hz
6Hz
6Hz
0.5Hz
0.5Hz
105％
52.5％
100 120
50 150
Inverter output power (%)
(% to the inverter rated current)
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Initial value Setting range
110% to 250%
*1
0 to 500 A
*2
0 to 3600 A
9999
0 to 590 Hz
9999
1% to 100%
9999
0 to 590 Hz
9999
1% to 100%
9999
0 to 590 Hz
9999
110% to 250%
9999
0.5 to 30 kΩ
9999
0 to 60 s
∗2
∗3
Operation region
Region on the right of
characteristic curve
Non-operation region
Region on the left of
characteristic curve
Characteristic when electronic thermal relay
function for motor protection is turned off
(When Pr.9 setting is 0(A))
Range for
the transistor
protection ∗4
230
Description
Set the permissible load according to the motor
characteristics.
Enabled when the RT signal is ON.
Set the rated motor current.
Second electronic thermal O/L relay invalid
The electronic thermal O/L relay operation level can
be changed to match the second motor temperature
characteristics with the combination of these three
points (Pr.692, Pr.693), (Pr.694, Pr.695), (Pr.696,
Pr.51) when the RT signal is ON.
9999: Second free thermal O/L relay invalid
Set the permissible frequency when the RT signal is
ON.
The Pr.607 setting is applied even when the RT signal
is ON.
Set the PTC thermistor protection level (resistance).
PTC thermistor protection disabled
Set the time from when the resistance of the PTC
thermistor reaches the protection level until the
protective function is activated.
5.7 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
267
5. PARAMETERS