Mitsubishi Electric FR-A820-00046 Instruction Manual page 477

Parameters
Motor permissible load level setting (Pr. 607, Pr. 608)
The electronic thermal O/L relay operation characteristic can be changed by setting the permissible
load level according to the motor characteristics.
Fig. 5-124:
Electronic thermal O/L relay pre-alarm (TH) and warning signal (THP signal)
● If the accumulated electronic thermal value reaches 85% of the Pr. 9 or Pr. 51 setting, electronic
thermal O/L relay function pre-alarm (TH) is displayed and the electronic thermal O/L relay pre-
alarm (THP) signal is output. If the value reaches 100% of the Pr. 9 setting, the motor thermal
protection (E.THM/E.THT) is activated to shut off the inverter output. The inverter output is not
shut off with the TH display.
● The inverter output is not shut off with the warning signal (THP).
● For the terminal used for THP signal output, set "8 (positive logic)" or "108 (negative logic)" in any
of Pr. 190 to Pr. 196 (output terminal function selection) to assign the function.
Fig. 5-125:
NOTE Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection)
may affect the other functions. Set parameters after confirming the function of each terminal.
FR-A800
Motor permissible load
110%
240
180
120
60
0
80
(% to the inverter rated current)
Example of motor permissible load setting (when Pr. 9 = "100% of the inverter rating")
Electronic thermal
relay function
operation level
Electronic thermal
O/L relay alarm
(THP)
100 %: Electronic thermal O/L relay activation value
Prealarm signal output
Motor permissible load 150% (Initial value)
Motor permissible load 200%
Range for the
transistor
protection
100 120 140 160 180
Inverter output power (%)
OFF ON
(H) Protective function parameter
200
ON
Time
I002851E
I001138E
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